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Local house extension experts in Welwyn, Hertfordshire

There are 1217 House Extension specialists in Welwyn, and last month we helped homeowners get quotes for their home improvement jobs.

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Hello, my name is Ronnie and I am builder, born and bred in London, I started off nearly 30 years ago working with my dad, and have now taken over the business with my son, I am fully committed & driven to provide outstanding quality at a fair price. I am a fully qualified plasterer by trade, however over the years my skills have grown and grown in other trades also, giving me the opportunity to take on bigger work i.e. extensions, landscaping and full property refurbishments, to include from design to fit kitchen and bathrooms, however there is no job to small and welcome all types of plastering and building work. all my work is fully insured and I pride myself on being extremely polite, very clean and tidy and unbelievably punctual and reliable. many thanks for taking the time to read my profile and viewing my previous work pictures

Latest homeowner review

Reviewed by Alan on 19/4/2025

Great job. Did exactly what he said he would do, and exactly what we wanted. Very happy to recommend and will use again.

AS Roofing & Construction Ltd is your trusted expert for all aspects of roofing and construction. With over 15 years of experience in the building industry, we bring knowledge, skill, and a commitment to quality to every project we undertake. We specialise in all types of roofing, including: • Pitched roofs with slates and tiles • Flat roofs using felt, liquid coatings, rubber, and fibreglass systems • Full lead work services including lead welding • Cement work, pointing, and general brickwork repairs Beyond roofing, we also undertake full property builds from the ground up, handling every stage from foundations to final finishes with precision and care. Our services also include: • Jet washing of roofs, driveways, patios, and building exteriors • General bricklaying and masonry work At AS Roofing & Construction Ltd, we pride ourselves on delivering reliable, high-quality workmanship with a friendly, professional approach. Whether you need a small repair, a full re-roof, a new build, or property maintenance, you can count on us.

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Reviewed by Mark on 15/5/2025

Top job done!....Aaron a respectful and competent fella.

At OCTOPUSBUILDERSLIMITED, we pride ourselves on our extensive 16 years of experience in the construction industry. Our dedicated team works collaboratively to handle every aspect of your building project from A to Z. Whether it’s residential or commercial, we ensure quality craftsmanship and excellence in every job. Let us turn your vision into reality!

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Reviewed by NORMAN on 1/10/2024

Great job and would definitely rate it higher if I could. Will keep in mind if I need other jobs done around the house.

We specialise in all aspects of construction work. We are completely dedicated to our work and put our experience into the job to make our customers satisfied. We aim to do our best and succeed 100%.

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Reviewed by Ralf on 9/4/2018

One to be careful with is the electrician Ben. The work seems alright, but his advise left us with excessive lighting in Kitchen and sitting room and our decision against TV sockets in ALL rooms was interpreted as NO TV and phone socket at all, which then later had to be added at extra cost and left the choice of suppliers limited. His crew also did the plumbing and the bathroom installation and the later was not done to the general standard of U&U constructions work.

My name is Ioan I’m in the construction industry science 2013 Iwas working for one company until last two years when I decided to stated my own business.

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Reviewed by Marc on 21/4/2025

Ended up delaying the project by a year but he just completed it last week. Was really happy with the result.

We are pleased to continue providing a professional and dependable service to all our clients, fully recognizing the essential role that high-quality standards contribute to our success. Looking forward, we anticipate that the robust relationships we are cultivating will result in an increased number of satisfied clients, fostering further recommendations and sustainable growth.

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Reviewed by Angela on 13/11/2015

Fedor and his team are polite, hard-working and extremely talented. It was a complicated job and Fedor handled it brilliantly. We are absolutely delighted with the beautiful London Stock brick wall that has been built. We would definitely recommend Fedor and Cuicut Construction, and will certainly use them again in the future.

We can offer with confidence a professional and innovative service . Regardless of size or difficulty we will fulfill and exceed all criteria within your budget and time allocated.

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Reviewed by PATRICK on 4/8/2024

We are a specialist Loft Conversion company with over 15 years experience. We offer a complete solution, design, planning and construction for your project. With references all over London you are welcome to view past projects. Call for a free quotation.

Latest homeowner review

Reviewed by Paul on 21/5/2022

Had a very positive with Mark and the Unique Lofts team for our loft conversion. I would highly recommend them. Michael and Brad (our team) were friendly, dedicated and hardworking. Our neighbours, who had the skip chute cross their garden, also shared how considerate and friendly they were. Michael kept me in the loop, followed up on my enquiries and gave some really helpful advice in moving airing cupboards and opening up the loft space for more natural light. All in all, highly recommended.

Am construction are a highly friendly & experienced team of builders with over 15 years experience in all aspects of construction. From little jobs to large projects. We care about our customers and our own quality of work so are always happy to “go the extra mile” and if our customers need ideas we absolutely love getting involved in the plans as well.

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Reviewed by Bob on 19/11/2022

The whole job was completed excellently from start to finish. Prompt response and quick work. I would definitely use them again

Hello. We are the company that will provide our services quickly,qualitatively and at a good price. Do not hesitate to contact us.

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Reviewed by Ben on 15/6/2025

AGC Electrical is a small and friendly company with an emphasis on customer satisfaction. Our pricing is reasonable and we aim to provide the best overall experience to all our customers.

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Reviewed by rachel on 11/2/2025

Good communication and was on time. Job was done well.

I have been working in London since 2007, in those 16 years I have done plastering, wooden flooring, wooden fencing, ceilings and much more. I am new to Rated People, however I have the experience and can provide reference for previous work upon request.

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Reviewed by Francoise on 29/5/2025

Vasile replastered two ceilings in one day. He did an amazing job, and kept everything clean leaving the rooms spotless. Would definitely recommend. F.

B S Building Services

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Reviewed by Mick on 27/7/2025

Bartek arrived promptly explained what we needed doing took pictures Recieved a quote from him happy with everything 2 weeks later on Sat morning arrived completed work's exactly what we wanted proficient and cleaned totally when finished would 100% hire him again

I’m very good builder I have a experience 12 years

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Reviewed by Joanna on 10/2/2024

Competitively priced and did a great job. Were tidy and got the job done in good time. They replaced the ceiling in the bedroom, put in some additional sockets and moved and light switch and decorated the room.

I have more than 15years experience in building work The work which I undertake is Lofts Extensions Kitchen Bathrooms Bedrooms Interiors Pluming Electrical Exterior Safety / Security Roofing Qualifications Joinery Kitchen installations Bathroom installations Carpentry work (doors, wardrobes, flooring) Plumbing Plasterboards and metal work Tilling walls, floors Gardens wooden storage shed.

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Reviewed by Naomi on 25/1/2024

Amir arrived to fix my leaking toilet. He was polite, tidy and efficient . I will use again with future works

DNC Carpentry and fit out was establish in 2014 by Dumitru Creanga who has over 20 years experience of site carpentry. We offer supply and fit services for kitchens and fitted wardrobes to maximize every millimeter of your space in high ceilings rooms, tailor-made wardrobes to fit exact contours of your space and sloping ceilings, understairs cupboards where storage space is just waiting to be created, landing and hallways creating storage where you didn't think you could have it. The company has over 20 experienced carpenters who have to demonstrate to meet DNC Carpentry and fit out high standards before being allowed to join the company. All of our carpenters hold CSCS cards as a minimum and undergo a continual programme of training. We're very proud of our products with an obsessive attention to joinery. When you buy a product, it's designed specifically for you. Nobody else. Your family, your lifestyle and to your rules. And rightly so; it's a big investment, a dream, in most cases. And one that we want to get IT right. Not only are our customers looked after by an experienced Designer, they're also cared for throughout the installation process by one of our Project Managers. Giving peace of mind to our customers that they are in safe hands every step of the way.

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Reviewed by Leonie on 3/6/2024

The job is still ongoing but the guys have been commutative and quickly responsive

Construction company .Quality is my priority.the best price keep my clients happy.thank you

Latest homeowner review

Reviewed by Stuart on 3/8/2025

Gabi responded quickly and came round promptly. Completed the required work and also suggested additions to make the door stronger.

A small company that is hard working and trustworthy, we take on a variety of works and try to give the best advice possible.

Latest homeowner review

Reviewed by Paul on 27/3/2022

Unfortunately I am still waiting for a quote which is disappointing.

I highly recommend AYG Construction , very good job quickly done very reasonable quote, thanks to Adrian for his hard work. Finished double storey extension on time and very helpful throughout.Excellent quality and price. Welcome back any time. Thank you!

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Reviewed by Mark on 20/1/2016

Adrian and his team met or exceeded my expectations, always willing to match my needs and finished the job on time and within budget.

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Reviewed by Chris on 11/4/2014

Vey helpful went above and beyond to get the job cimoleted

We have a double glazing factory and have been erecting bespoke windows,porches and conservatories for the last 12 years.

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Reviewed by Mokdus on 5/3/2017

Very good job

A small Carpentry & Fitting company able to produce impressive results in a short amount of time.

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Reviewed by NICOLAS on 13/3/2018

Blagoy has delivered a quality job and been very helpful. You can trust him: very professional always on time (although there was very bad weather), deliver within the time he said. You can tell he has experience in construction and can also do smaller job with attention to details. He is multitask (did our kitchen, electrical work and plumbing). I would 100% recommend him as he does a very good for a good price !

We are a small but trustworthy and hard working team with many years of experience in building trade.We limit the number of jobs running at one time so that we are able to offer attention to every detail & deliver quality service on time &on the budget.

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Reviewed by Nicola on 9/11/2013

Had a sliding door fitted wardrobe from B&Q fitted. Hard working guys. Did a good job which we are happy with

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Reviewed by Heather on 21/3/2011

Lovely floor fitted in a childs bedroom, at a reasonable price. Work completed very quickly following agreed quote. I would definately use this tradesperson again.

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Reviewed by Roger on 25/4/2012

Took Nigel a while to call back to confirm a date and time a date and time for the work. Once he did though, he kept exactly to his word. Turned up, on time and completed the plastering for our stairway to a very high quality with patching and skimming work. The price was very fair and he finished in the time he said he would. We are very, very pleased with the finish.  Thanks again Nigel 

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Reviewed by Alison on 7/6/2013

While the work has been excellent Sterling Construction have left a job half finished for over seven months. Their reliability leaves a lot to be desired which is a shame considering the first job they completed was carried out so well.

Hello, I have been a plasterer for 18 years and building for 25 years. Plastering is my main trade but I am a good brick layer and general builder.

Latest homeowner review

Reviewed by Ema on 30/5/2017

Polite speedy response, unfortunately needed the job completed asap and he was busy this week. Would contact again for future work

We are building and construction company with more then 15 years of experience Let us turn your house into a home All our work is finished to high quality standard

Latest homeowner review

Reviewed by Seema on 15/8/2014

I used AGL to decorate my 5 bedroom house in W12 in April 2014. The standard of the work was excellent. They are experienced and were able to come up with practical solutions to issues that arose. They were able to carry out addition electrical and plumbing work. Their quote was competitive and transparent. They repsonded promptly to calls and emails. AGL were trustworthy and reliable and I have since made several recommendations to friends. I would definitely use them again.

Hi I am BrightWorkPro i am An Expert in Properties Maintanance, Painting, Repairs, Bathrooms, Electric and plumbing GARDENING Clarence and domestic cleaning!! Loft conversions, Extensions anything related to building constructions due to over 5 years experience in property maintenance management. i am very flexible and ready for ACTION!!

Latest homeowner review

Reviewed by Nikita on 11/5/2022

We are a Home Refurbishment Service Company specialising in loft conversions, extensions, tiling, carpentry, bathroom and kitchen refurbishment, We have a team of experts with many years experience providing quality service at a professional standard.

Latest homeowner review

Reviewed by Fahad on 22/10/2019

When I met Zak, I felt comfortable as his knowledge In bathroom fitting was better then all the other fitters. He shared really good ideas, which helped us create our dream bathroom. He was very professional and cleaned up after every evening even though we were not living in the property. His tiling was spot on perfect. All the fixtures are perfect. He will always think of a solution, and ask you, as he wants to make sure the Job will be perfect. We have now decided to use Zak again for our cloakroom

We are a family run business specialising in the following: - Extensions - Loft Conversions - New Roofs - Roof Repairs - Fascias & Soffits Alltype Building Contractors UK Ltd are a leading building firm based in Kent with easy access to the South East of England and London. We pride ourselves in providing our customers with the highest level of workmanship, and in using only the best materials available. The company was established in 1985 and was incorporated in 2000. Over the last twenty years Alltype Building Contractors UK Ltd has grown steadily as a direct result of a rigorous commitment on client satisfaction. While the company has grown substantially, the maintenance of a ‘hands on’ policy by senior management in the day to day running of all projects ensure that this client satisfaction is maintained. Sound management principles, proactive construction methods, ongoing attention to detail and quality of workmanship are all key principles of workmanship and are all key principles of Alltype Building Contractors UK Ltd.

Latest homeowner review

Reviewed by Bernie on 9/4/2025

Akoni is a building company who can provide you with peace of mind and satisfaction. Our primary aim is to make sure our clients are respected and listened too with what they want to achieve. Over 20 years experience previously known as Aquafix which was predominantly bathrooms and heating systems. We branched out into our own developments and renovations. We now cover all trades and can supply you with the best results. All trades are fully qualified with years and years of experience. We aim to work closely with our clients from start to finish and use some great designers, architects, and structural engineers to help the process easy and take the stress away from you.

Latest homeowner review

Reviewed by Tom on 9/4/2025

Dan and his team were truly exceptional from start to finish! A very talented and highly professional team that made sure we were actively engaged on every step of a large project, covering nearly every trade possible, with one clear and obvious intention - to make all of our aspirations come true. The attention to detail on every aspect was superb, alongside excellent craftmanship delivering a tremendous finish. The Team were punctual, very friendly, always enjoyable to have in our home! Highly recommended

Hi, This is Alphatec ltd. We have specialised team to take all types of building jobs. We are specialised in Bathroom fitting, Plumbing , electric , new builds & renovations

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Reviewed by Katy on 10/6/2025

Inder did a very good job of upgrading our upstairs bathroom and installing a toilet downstairs. He worked tirelessly and was very punctual. Great on communication too!

We are a company with over thirty years experience in the construction industry we pride ourselves on customer satisfaction and quality workmanship we offer a friendly and efficient service which has gained us repeat buisness with lots of our clients

Latest homeowner review

Reviewed by Tim on 26/5/2020

Gerry is a real asset! Very friendly and responsive. He provided me with a detailed quote for repairing the garage door and fixed it within the same day. Absolutely happy with the services and will use him for any jobs in the future.

With over 25 years of experience, we are a fully insured professional building company specialize in all aspects of home improvements, We are a team of hard workers, giving the best at all the time. We pay a great attention to details and we put the quality first. Keeping the work area tidy is a habit for us. Quality and meeting the deadline are very important factors for us when we doing a job. Our goal is to achive customer satisfaction when we doing a job! We offer competitive prices and free quotes

Latest homeowner review

Reviewed by Zak on 9/1/2020

Excellent family run business with father (Marion) who is the main man for the job Reasonable quotes and prompt with phone calls and replies Would highly recommend the team

ArrA Brickwork & Building Covering London, out of London within 50 miles radius, Essex, Middlesex, Kent, Surrey areas. We are 4 persons small run family business. We are offering high quality bricklaying, inside renovation, outside rendering, paving services at affordable prices, carried out by high quality brick work with 18 years of experience in the construction industry. Our team seriously and punctually to work. We offer all kind of building on housing and commercial projects. All types of contracts undertaken, day work & price work. . We are specializing in; • Porch • Extensions • Garages • Outbuilding • Round Brick Work • Art Brick Work • Stone Masonry We offer friendly advice on all building needs for private landlords also will come in person to view job. With customer queries everything comes with paper work. With Regards ARRA Brickwork & Building Team

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Reviewed by Roopesh on 4/1/2021

Poor quality

Need extension, loft conversion, new basement, waterproofing or damp proofing, swimming pool or garden office, full house renovation? Call Us for a free quote.

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Reviewed by Jayne on 30/5/2013

DPS did an excellent job. They were transparent in their explanations, communicative, punctual and left the place spotless! Excellent work ethic and workmanship.

RekaPlumbing / home renovations Extensons - loft converting - bathroom - Gas installtions - boiler Installa - service

Latest homeowner review

Reviewed by John on 4/1/2016

Fantastic service, card kept will use again

George

House Extension in Welwyn

Do you have a list of projects that need to be done around the house? Do you need a room remodeled, a porch built or some quality painting done? We are friendly, qualified, honest and on-time. We are available for emergency needs 24/7.

Latest homeowner review

Reviewed by Lyn on 26/5/2022

George and his guys are hard working skilled tradesmen. He went the extra mile to give us a good job. Polite quick and tidy. Would recommend and would certainly use again.

High quality and professional builder experience of over 13 years.

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Reviewed by Nana on 18/4/2019

He was always on time and very efficient and hard working guy. The standard of his work very good

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Reviewed by Zsuzsa on 9/1/2019

Although it turned out that there was no leak only the condensation caused the problem, I got a professional advice and for free! Will definitely call them back!

AWM Windows, Doors and Conservatories are a family owned manufacturer and installer of high quality uPVC and Aluminium windows, conservatories, roof lanterns & doors. We are a Nationwide company carrying out Building Works alongside the supply and fit of windows and doors.

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Reviewed by Kevin on 16/10/2018

This job was paid for in full, and since being done I have had another company out to refit and replace doors. You were paid in full - it's strange how it's taken 6 YEARS for you to answer the review!?!?!?!

Hi! WE ARE SPECIALIZED IN KITCHEN AND BATHROOM FITTING ALSO ALL TYPES OF GARDENING AND EXTERNAL HOUSE INSULATIONS. YOU THINKING AND DREAMING WE DOING

Latest homeowner review

Reviewed by Margaret on 18/4/2013

We have not gone ahead with his quote but Piotr was excellent at contacting me and keeping in touch with regard to the appointments made for him to come and view the work. He was very friendly and professional and listened to what we wanted/needed and came back with a quote within a couple of days. I would have liked the quote to be a bit more detailed and ‘professional’ looking – but this was not the reason we decided not to work with him. I wish him luck with other jobs.

Home improvements father and son we do most things.If you would like to see some before and after pictures, take a look at our pictures to help you feel more comfortable and see the quality of work you will be getting.

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Reviewed by Lin on 15/7/2013

Rob arrived when arranged, was polite and did a thorough job, even more than requested. Tidy and neat work. I would use their services again and recommend them to others.

Dyno Plumbing/Rod. We are a specialist plumbing & drainage company, we offer a wide range of services from a dripping tap to a full bathroom installation and everything in between. we also offer internal/external drain cleans or a waste replacement service. So many more services available, Set prices available for taps, sure stops, shower pumps. We also offer complete power flush of your heating system.

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Reviewed by Christopher on 16/7/2024

Speedy response a day after posting to replace kitchen tap and cistern mechanism. Ryan and Jamie arrived swiftly, they were very courteous and carried out the work efficiently without any fuss. Would highly recommend and use again.

ivan

House Extension in Welwyn

I am professional tradesman, who takes pride at his work. I have more than 10 years expertise in England with brick layering and in depth metal works. I am specialised in plastering and external decoration andbrendering.Outside of England I have more than 12 years experience in the fields.

Latest homeowner review

Reviewed by brenda on 23/11/2016

Ivan did a very good job with our brick wall, well priced, we are happy with his work and highly recommend him.

No matter what your project entails,we're aware what is involved when you get work done around your home.We are honest professionals,reliable and able to delivery what you expect. over 10years of experience and insurance. no cowboys !

Latest homeowner review

Reviewed by Tariq on 23/8/2016

Great team. Not difficult about price and unbudgeted/unplanned follow on work. Will hire again.

RFMM LIMITED is a construction company specialised in refurbishments, loft conversions, extensions with all professional people that are skilled.

Latest homeowner review

Reviewed by Paul on 27/11/2017

I employed Rrok and his team after being let down by a previous builder (not on this website). From the very start of the project I found Rrok to be a very professional person that listen to us and the works required for this project. Whilst on site him and team where happy people always smiling and working hard to complete the works in the tight time scale we had. If we had a concern with a certain aspect of the works we raised this with Rrok and he immediately talked us through the remainder of them work

Erlis Molla Construction with more than 13 years of experience in the Construction Industry. We work to complete projects quickly and efficiently. We take pride in our work and make sure we always achieve high standards. Ability to do wide variety of wo

Latest homeowner review

Reviewed by Chris on 27/4/2016

Erlis arrived on time and was very polite and professional throughout the day. He did an exceptional job (the walls are now unrecognisable from the mess I left them in previously - now lovely and smooth). I appreciate it all the more as it was far from being an easy job - our hall is a very complicated shape with a large number of corners. I would definitely consider calling Erlis to carry out future work in our house and would highly recommend him to others. Thank you for putting me in contact with Erlis.

Latest homeowner review

Reviewed by Parvin on 3/2/2016

They were very dodgy and unreliable. They took all the agreed money but never came back to finish the job. I was left without a kitchen, cooking utilises and drinking water for two whole months as no other builders were willing to pick up the mess they left behind. The garden was a complete mess with concrete and heavy building rumble. I strongly advise people to be wary of hiring them.

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Recently completed jobs

Here's what's been happening in and around your area

ground floor extention 40...

ground floor extention 40 square meteres.

Size of extension: 2 rooms...

Size of extension: 2 rooms Height of extension: 2 floors Room(s) to be in the extension: bedroom(s), kitchen It will be a dinning room extension...

single story extension to the...

single story extension to the side/rear of the property, approx. 8 x 6 meters

Rear extension of single...

Rear extension of single storey

Stud walls, wet room, hallway,...

Stud walls, wet room, hallway, conseratory

A extension on the back of...

A extension on the back of house

Convert back half of garage to...

Convert back half of garage to increase kitchen size, and add room beyond kitchen around 16' x 12'.

Rear extension, flat roof

Rear extension, flat roof

2 storey side extension

2 storey side extension for a semi in Welwyn Garden approx 7mx3.7m. Planning permission granted.

Build Phase 1 Gym & Garage

Hi, We are looking for someone to demolish our existing car port and construct a gym and garage complex in the first instance. We have been granted...

How our service works

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    We'll connect you with the right tradespeople, from over 30 different trades.

  2. Get quotes

    Up to 3 tradespeople can provide a quote, but on average you'll get 1-2.

  3. Check ratings

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  4. Pick a tradesperson

    Use our homeowner checklist for extra tips on choosing a tradesperson.

  5. Job done

    Leave a rating for your tradesperson based on quality, reliablity and value.

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