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Local house extension experts in Welwyn, Hertfordshire

There are 1214 House Extension specialists in Welwyn, and last month we helped homeowners get quotes for their home improvement jobs.

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We are a company specialized in the world of construction, hard landscaping, foundations and gardening. Please have a look at the "our services" section for more information. We offer free quotes and consider any job, large or small. Visit our contact page to contact us or fill out the form at the end of the page.

Latest homeowner review

Reviewed by Christina on 31/8/2023

Elton and his team did a fantastic job for me, rectifying some unfinished work left by another builder as well as some additional jobs (block-paving, installing a soak-away channel, removing a door and bricking it up). He is knowledgable, highly skilled at what he does, trust-worthy and communicated well throughout. His team worked tirelessly on some gruelling tasks and with perfection. I would not hesitate to recommend Elton and team and am delighted to have finally found a quality builder that I trust.

Latest homeowner review

Reviewed by Ross on 12/5/2021

Michael did a great job hanging a new bedroom door. He came at short notice, was knowledgeable, friendly and cleaned up afterwards.

Bright life? We are a fensa registered company and have been providing the best services to Buckinghamshire and surrounding areas since 2009. Suppling and installing A* rated double glazing at unbeatable prices, superior quality and exceptional customer service are guaranteed when you work with us! We also offer a 10 year warranty on all our product! Supply and install - - windows -doors -conservatories - warm roofs ( guardian roofs)

Latest homeowner review

Reviewed by Andrew on 3/4/2023

Henry was brilliant and put new double-glazing throughout the house. Very efficient and tidied up nicely after the job. Definitely recommend !

With decades of expertise in Sydney and London, our business strategies empower communities and drive innovation.

Latest homeowner review

Reviewed by Valerie on 17/10/2024

Great communication from start to finish. Aaron kept me updated on what the situation was and what he was doing The price quoted didn’t change.

With more than 9 years experience in all aspects of carpentry and joinery I am specialised in all types of carpentry services.Reliable, excellent eye for detail and willing to go the extra mile I aim to please my customer and work to a very high standard.

Latest homeowner review

Reviewed by Rona on 22/8/2022

Vlad is very professional, hard working, punctual and extremely efficient. His work is great and as well as his personality, extremely helpful, and reliable! He did all the architrave, skirting boards, door frames from scratch, as well as installing new doors with handles and locks, LED covings, LVT flooring and stairs banister! Can’t praise him enough and will def recommend him and save his number for any future jobs!

We are a team of highly skilled individuals, with a great sense of professionalism and integrity. Our purpose is to deliver the transition from our customer's vision to reality and strive to bring satisfaction and joy with the results of our work. We aim to offer the best possible service while building trust with our clients. Having over a decade experience in the building industry, gives us the possibility to be quick, flexible and efficient.

Latest homeowner review

Reviewed by Zillionz on 2/5/2024

Hello there we have started with windows supply and installation but now we spread into all types of building and maintenance work.

Latest homeowner review

Reviewed by Rose on 26/12/2019

I very much appreciated Boris viist. He was really honest and proactive. He really helped me see what was necessary in my project. Unfortunately, I didn't use his service because it was not planned and over my budget.

Managing director of the business

Latest homeowner review

Reviewed by Mumtaz on 27/10/2011

Quality---Five stars Value----Five Stars Reliability--Four stars

Latest homeowner review

Reviewed by leanne on 18/1/2012

We used LFC for a rear ground floor extension, this was the 1st time we had undertaken major build work, so we were understandably nervous. LFC made us feel very comfortable, there work was of the highest quality and they worked extremely hard; even tidying up at the end of each day. We were consulted on a regular basis as to how work was proceeding and given options for directions forward. I would thoroughly recommend LFC to anyone in need of build work – large or small, their prices are incredibly good and the dedication and attention to detail are very impressive. Very much look forward to using LFC in the future.

Latest homeowner review

Reviewed by Anna on 16/10/2011

Courteous, reliable and flexible. A thorough and tidy job done.

I am experienced, fully qualified property decorator offering a good efficient and reliable property refurbishment and maintenance services at very reasonable prices. All my works are finished to the highest standard using quality products.

Latest homeowner review

Reviewed by Terri on 6/4/2013

Radoslaw did a great job, highly recommended. Efficient, high quality painting and decorating. Thanks

Latest homeowner review

Reviewed by George on 19/7/2013

As the advert says he did everything that's written on the tin. Came on time, worked very hard, did a good job and the bill was the same as the quote with no "add ons".

I am a multi skilled tradesman with sixteen years experience, specialising in plastering. I offer an efficient and reliable service at affordable rates, and while new to Rated People, I can supply satisfied customers' references instead of ratings.

Latest homeowner review

Reviewed by David on 15/4/2013

An excellent service from initial email to job completion. Rapid response. Good results at a fair price. He tidied up and left no mess. A polite and professional young man.

Hi I'm Liam and I am a trade qualified carpenter both with a city and guilds and an NVQ. My skill set doesn't end there as I have my own company doing general building work. We can accommodate all types of works big and small to a very high clean standard

Latest homeowner review

Reviewed by George on 8/2/2017

Liam was a really nice guy he hung 5 doors and replaced all the skirting in 3 of our bedrooms. The work was carried out to a good standard. Liam was asked to have a look at our creaking stairs while he was there and was kind enough to fix this at the same time free of charge. Liam's number has been saved in my phone and he will be my first call should I need any form of joinery in the near future. Also left the place nice and tidy finished on time. Thanks Liam George and Amy George and Amy

I am a highly experienced builder with over 30 years behind me having built anything from new houses and flats to garden walls. I am a concientious worker and tidy up as I go not leaving a mess behind me.

Latest homeowner review

Reviewed by john on 27/4/2013

a very good job.friendly service and reliable man.i would use him again.

We are a family owned Building Company who under take a variety of building works which enables us to manage your contract from start till finish.

Latest homeowner review

Reviewed by Imran on 14/9/2013

Steve was brilliant from the very moment we met. His in depth knowledge in installing artificial grass put my mind at ease and I knew he would do the job to a high standard. As he was installing at a childrens nursery he was very flexible installing over the weekend so that it was less disruptive. I wouldn't hesitate to use Steve & Lee again and have already recommended them to other people I know.

Latest homeowner review

Reviewed by Alex on 27/3/2014

We could not be happier with our new wall - it has totally transformed the look of our garden, and made it much safer and more secure. Sam and Luke were excellent from start to finish: arriving promptly on the days arranged, working tidily and efficiently, as well as being very patient and clear when answering all our queries. I would not hesitate to recommend them to others, and have already asked them to provide a quotation for further work.

Hello.We are a company with a professional team who works in every part of London.Service's range: -Painting and decorating (high quality)-Partition walls -Demolition -Hydraulic -Plumbing -Electrical -Plastering -Woodwork -Perform emergency situation

Latest homeowner review

Reviewed by adam on 25/8/2018

the gentlemen know his trade and very polite

GM Construction Services & Solutions is a family business based in the South East of England. The partners have over 35 years experience in construction and architecture, we provide a professional service, quality workmanship and value for money.

Latest homeowner review

Reviewed by Steve on 26/7/2014

Julian and his team were the best building experience we have ever had ---without doubt. Julian is incredibly friendly and helpful working with us closely throughout the build to check we were kept in the picture, happy satisfied and on budget. Julian's team of workers were the most friendly and hard working we have ever experienced, always ready to meet our requests. We are delighted with the quality end result and would not hesitate to recommend to friends and family alike. 5 stars all round!

Latest homeowner review

Reviewed by chrissy on 3/3/2014

Very happy with the service

Latest homeowner review

Reviewed by Silka on 12/5/2014

They turned up exactly when they said they would (at 7pm so I didn't even have to interrupt my working day) worked quickly and efficiently in pouring down rain, and got rid of a load of unwanted rubble and wood, transforming a section of my garden. Great work, good value.

T J B

House Extension in Welwyn

I have been in construction for nearly 20 yrs and have covered all aspects of external works including drainage,foundations,concreting,paving,damp proofing and structural works i try to provide a honest and reliable service

Latest homeowner review

Reviewed by Raj on 5/3/2014

In summary, extremely impressed. Tony was able to fix a longstanding issue with uneven brick paving in block of flats I manage the next day at a very reasonable rate and with great communication throughout. Will be reaching out to him for other jobs as they arise due to his professionalism.

WBK Construction Ltd is made up of several experienced, talented craftsmen, each committed to providing clients throughout Surrey with bespoke building services completed according to your specifications.

Latest homeowner review

Reviewed by Chris on 4/7/2019

A good job and clean up done. Punctual and reliable. Would definitely use again.

Hello My name is Costel Dumitras. I am a professional kitchen fitter. I have aquired my skillset over the course of a long career both on the Italian and British market. Although my main focus is kitchen fitting, I also undertake a wide range of carpentry jobs such as build in furniture, doors hanging , laminate/hard flooring, skirting boards, architrave, mouldings etc., and general furniture assembling/fitting. I'm very professional, with great hand dexterity and an eye for details. Don't hesitate to get in touch!

Latest homeowner review

Reviewed by Shamara on 6/3/2023

Did the job quickly and efficiently!

Hello it’s Herta Construction Ltd, we area builders in the London area. We specialise in extension, loft conversion, bathroom renovation, kitchen renovation, all types of roofs, carpentry and much more. Me and our team will put together high spec finishes at fairly low cost. My cost will be broken down and clear for the client to see. More than happy to do quotes for large or small jobs. We have a number of references in the area and I am more than happy to share them with you. I believe our work speaks for itself so please get in touch. Thanks.

Latest homeowner review

Reviewed by Nicolaus on 14/3/2025

Sunrise builders and decorators is your local friendly and reliable roofing and building company offering all aspects of property maintenance, from minor repairs to new installations also all aspects of guttering, facia and soffits from repairs to new with over 15 years experience contact us today for your free quotation.

Latest homeowner review

Reviewed by John on 23/10/2020

Micheal did a great job, going above and beyond what was required in some instances. Timely, neat and polite. Would happily recommend.

Artisan Builders are a small company who have been trading for over 30 years around the Essex and Cambridgeshire area. We have a wealth of experience with a range of building works and trades. We aim to provide a friendly and professional service at all times.

Latest homeowner review

Reviewed by Lynda on 2/4/2014

First Class Company. We found Trevor and his people very courteous and friendly and they are most reliable.We are very satisfied with the work carried out.

With over 20 years of experience in the home improvement and repair industry, I offer a full range of services, including plumbing, electrical work, tiling, carpentry, and central heating installation and maintenance. My expertise spans all aspects of home systems, from wiring and lighting to pipe repairs and heating solutions. As a fully qualified professional in both electrical and plumbing services, I take pride in delivering reliable, high-quality work that meets the highest standards of safety and efficiency. Homeowners choose me because of my commitment to providing personalized service, ensuring that every job is completed with attention to detail, on time, and within budget. Whether you're dealing with routine maintenance or an urgent repair, you can trust me to handle the job with care and expertise, giving you peace of mind in your home.

Latest homeowner review

Reviewed by Rachel on 19/12/2016

Reliable and efficient. Would def use again. Discovered the problem with the dishwasher was just the plug and told us without trying to make it sound like a bigger job.

Over 30 years in the industry and covering all aspects. Internal and external works, big and small. Have been doing lots of internal refurbs including kitchens and bathrooms , more recently. Multi skilled tradesman.

Latest homeowner review

Reviewed by Francine on 3/5/2024

We have over 30 years experience in refurbishment / building work. We offer all building services. We can design & build. We are happy to give you a quote for your job. We are happy to work on big or small projects. We offer competitive quotes. Happy to take a look at your job.

Latest homeowner review

Reviewed by Nikesh on 24/3/2025

sole trader operation with over 35 yrs continuous experience. trade indentured, city&guilds1st and time served.all aspects of brickwork with particular concentration to repointing, restoration,strengthening& surface cleaning.all lime& Portland mortar done

Latest homeowner review

Reviewed by K on 29/5/2025

Work completed to a good standard

We are a family run business with over 25 years experiance we pride ourselves on being friendly fast and efficient as well as clean and tidy all work is fully G/teed and insured

Latest homeowner review

Reviewed by Nick on 24/8/2015

Brilliant tidy work. Very happy! Thank you

Latest homeowner review

Reviewed by Karl on 13/7/2019

Bogumil was very efficient, he responded quickly to my advert of laying laminate flooring. He undertook the work the next day and done a great job. Clean and tidy, and was happy to get on with the job, he didn't even stop for a cup of tea. I'll be sure to use his services again.

hello, we are a small building service . clean tidy friendly tradesmen specializing in small building projects. high standard of quality assured. city n guilds time served tradesmen.

Latest homeowner review

Reviewed by Elisabeth on 5/10/2024

Very nice and pleasant, quick and competent, has a remarkably good sense of aesthetics.

Plumbing heating.building.painting decorating Extensions.loft conversions.tiling.plastering and many more

Latest homeowner review

Reviewed by Tara on 4/3/2016

Thank you for your prompt response, I no longer need a tradesman. Many thanks. Tara

I am a sole trader and have 15 years of experience within the building, painting and decorating trade My main skills: Painter/decorator Builder Kitchen/bathroom fitter Carpenter Roofer and all general maintenance.

Latest homeowner review

Reviewed by Annette on 26/2/2015

I'm very pleased with the repairs to the wall fixings and refix of our heavy motorized satellite dish which had come loose in the recent winds. The job was done very efficiently and promptly for the agreed budget and we are very pleased with the result. I would certainly recommend this trader based on this work and wouldn't hesitate to use I Grifi again for our future home projects and repairs. Many Thanks.

House redecorating, Bathrooms redecorating. All work undertaken! We don't have rating because we start working with rated people a few weeks ago and we haven't finish our jobs yet to get the rating

Latest homeowner review

Reviewed by Danny on 20/6/2016

Very fair pricing and well managed project!

We are a team with over 10 years experience in the building industry, specialists in kitchen and bathroom fitting, as well as all aspects of interior finishing. Our NVQ qualified team, professionally deliver high quality projects on time. Check our instagram @nse_carpentry

Latest homeowner review

Reviewed by Grant on 19/4/2025

Still in the process of getting the job done but Alex has been reliable and honest throughout. I have every confidence that the job will be completed at the price quoted (lower than other quotes) and to an excellent standard.

ANTO&CASY Building Ltd Dedicated Professional Building this hi say all not needed to ad story.. try me and I guarantee you’ll get the best results..

Latest homeowner review

Reviewed by Gary on 22/7/2025

Thanks

Latest homeowner review

Reviewed by Steffi on 27/5/2025

Based in Colchester, OMP Building Services Limited is a reputable and reliable bricklaying company with unrivalled expertise in the industry.

Latest homeowner review

Reviewed by Kevin on 21/4/2024

Oliver visited me to talk about the design I wanted for the new wall. He got an idea of how I would like it and was very helpful with any questions during his visit. The team of Leon, Lee and Will were very good. Leon made sure that everyone knew what was agreed. Do the job they made sure I was happy with the work. They were all very easy to get on with and worked well as a team. They left the site nice and tidy at the end. I'm very happy with the work. Definitely 5 stars. Cheers guys Kevin

Wonder Work Developments a property Maintenance and Building company ready to offer you a service you can be proud of

Latest homeowner review

Reviewed by Charles on 20/8/2025

I’m Harry Director of Saxon projects, we're a multi disciplined construction company specialising in plastering and rendering projects. With over 10 years of experience we’re proud to be known for the quality of our work and our reliable, professional service

Latest homeowner review

Reviewed by Rokshana on 11/6/2025

Great service provided by Harry. Arrived on time and completed the job to a professional standard. Highly recommend.

sashes, doors & Casement renovation ~ Draught-proofing ~ Cill-replacments ~ Locks ~ Architectural-Ironmongery ~ Bespoke joinery ~ Slim-line glass units ~ Acoustic treatment ~ Door panic hardware ~ Fire-proofing ~ Architectural-glazing ~ Closers & springs.

Latest homeowner review

Reviewed by Cyril on 13/1/2017

Samuel is not just efficient and professional, he's also great at keeping you up to date and talking you though what he's doing. It was a pleasure to see him work and I'll keep his number for anything in the future

Latest homeowner review

Reviewed by Laura on 15/6/2011

Hi Very good service, reliable and trusting. Painted all my rooms nicely and fitted it in when i wanted him to do it. I would totally recommend them to anyone.

Design and build company, renovations, refurbishments, house extensions and loft conversion.

Latest homeowner review

Reviewed by Beth on 8/1/2018

The team at BudMax, did an amazing job with the work on our house. We had a front extension, added a shower downstairs, made a bedroom upstairs larger, split one bedroom into two and redid the ensuite bathroom. They showed up on time, kept everything on budget. They worked with us on prices and kept us informed at every stage along the way. They were very tidy and clean - so much so that our neighbours on either side of us, commented on how clean it was everyday. We highly recommend BudMax!

Based in East London, professional team S N Build Ltd provides high-quality services to all. We’re one of the most professional companies in the local area and our home improvement services are always undertaken by experienced decorators. From soft landscaping to painting and decorating, we transform the inside and outside of your home to ensure everything is installed to match your specifications. Some of our services include: Building Repairs Tiling Painting and Decorating Carpentry Plastering Wallpapering Brick work Cleaning Services Construction Services Refurbishment Work Loft Conversions All Handyman Services Insurance Claims The services we provide are great for commercial and domestic customers.From quality construction services, cleaning and Handyman service we offer a great work and always tidy up when we’re done. Honest company, skilled builders and we use our life time experience to serve you effectively. Always agree with great prices for our clients! As specialists in construction we are more than happy to cover every aspect of your project! We make your dream come true.

Latest homeowner review

Reviewed by Azher on 19/4/2019

Excellent work. Very efficient and did it in quick time. Will call again

We are an established company , specialising in all aspects of property maintenance.So if it is a complete refurbishment or a simple bit of painting ,we have got you covered, Why choose us? WE are passionate ,honest and dependable .

Latest homeowner review

Reviewed by Ketul on 24/6/2020

We had Paul come in to paint our decking which was in not great shape, He thoroughly cleaned the decking and applied the paint and did an excellent job at a very reasonable price and finished the job in time.

Hi I am based in north London and offer a wide range of services, from groundworks ie: foundations, pouring concrete, drainage, steel erection, to complete extensions, also all Demolition work, roofing work, patio and driveway work undertaken, I have never advertised for work in 37 years in london, always went straight from one job to another,but this past year has been hard, so please look at my profile pictures and contact me regarding any work big or small, I have thousands of photos going back years of work done, ps underpinning aswell, thank you pat.

Latest homeowner review

Reviewed by sofia on 21/4/2021

Patrick did a great job in brickwork (opening our kitchen window aperture), pointing and skimming. He went along our tight schedule and provided helpful advice and a fair price. I strongly commend his work. Thank you Pat!

We are a great group of workers who have done some great work on building sites and residential jobs , always with good prices for excellent work

Latest homeowner review

Reviewed by Adam on 27/7/2019

I was in a bit of a pickle was let down at the last minute. keaton contacted me was really friendly. He turned up the next day with his 2 brothers. all 3 of them were excellent in every way. clean neat straight and level brickwork. No messing about. They came in got the job done. cant rate them enough.

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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

  1. Create a job - it's free

    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

    Look at each tradesperson's profile to see their ratings and reviews.

  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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