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Local house extension experts in Welwyn, Hertfordshire

There are 1226 House Extension specialists in Welwyn, and last month we helped homeowners get quotes for their home improvement jobs.

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Builder with excellent attention to detail. All building services catered for. Specialize in finishing trades, however can bring a project from initial plan to completion. Based in Barnet and serving London and surrounding counties. Fast efficient, timely and competitive. Customer comes first always. Will strive to meet the requirements and vision you are trying to achieve..

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Reviewed by Reg on 21/3/2022

Southern building contracts ltd are a roofing multi trade building company. The company originated from roofing 25 years ago and has developed and expanded to carry out building work to both domestic and commercial property’s. We carry out full property renovations, managing and carrying out all associated building trades. Sub contractors are managed directly by us for peace of mind from the customers to deliver from start to finish.

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Reviewed by Wayne on 19/5/2023

Excellent work completed by friendly & professional company. Highly recommend

At RnM Building Services Ltd, we strive to please our customers to their best satisfaction. We do a variety of things, such as:Carpenting, roofing, extensions, steel/structure work and lots more. We promise as a company that we will keep our word and we'll make sure we leave no customer without 100% satisfaction.

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Reviewed by Roger on 17/11/2022

Straight-talking, ran his team well, good quality workmanship

We are a London based construction company with a wealth of experience. Our fully qualified in-house team of engineers can help you turn around an old property with some much needed refurbishment, create a brand new space with a loft conversion, or even build an entirely new property. We also have expert carpenters on board who can create bespoke wardrobes, cabinets, under stairs storage or even garden shelters with full design and installation provided. Our team all have a collective 30 years experience in the trade, transforming properties and commercial buildings in and around London and the surrounding areas. We believe in competitive quotations and offer a free site survey for peace of mind. We pride ourselves on being able to not only offer a top notch service to our customers, but also friendly and professional advice on anything our customers would like to task us with. We have many accreditations under our belt, such as Gas Safe, CHAS and Safe Contractors, so our customers can be sure they are in the right hands.

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Reviewed by Ian on 5/4/2022

This company were not engaged to do any work

Professional team with many years of experience. We do plastering, painting, tiling, wall papering, fit laminate / wood / vinyl flooring, fit slabs, doors, kitchens, bathrooms and many more. No job is too big or small please do not hesitate to contact me. We are fast, reliable and cheap. Thank you!

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Reviewed by Camille on 18/8/2022

Great service, would use again.

Hi,there, a quality work at reasonable prices

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Reviewed by Dee on 26/10/2020

Very pleased with work from start to finish, would definitely recommend.

We are a family run business that specialises in Fibreglass roofing and building company with over 20 years experience in the industry, we can fit fibreglass to almost any environment, We have one of the best names in the business and take pride in all our work from quoting the job to finishing the job . We have our own teams of trades plumber joiner , plasterer , electrician for every job we can complete start to finish , I have a architect and Structal engineer for early stages in any new build. No upfront fees either , we always happy for you to call in and see our projects as we undertake them and our customers for peace of mind.

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Reviewed by Peter on 3/4/2018

Great job very professional

A-TECH BUILDING SERVICES LTD is a building company based in St Albans & Toddington, we are a family run business who pride ourselves on our workmanship. All our staff are time served and have many years experience in their given trade. Please see our website.

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Reviewed by Tola on 18/2/2025

Very professional and timely and did a great job connecting everything properly for us. Very grateful. Restored my faith in tradesmen.

We are a team with over 20 years of experience on building industry. We offer these services Driveaways, house extensions, Loft conversions, garage conversions, Summer houses, Bathroom fittings , Patios, landscaping, Fully refurbishment, etc.

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Reviewed by Ataur on 12/1/2021

Thank you soo much I m sooo happy About your work And Driveway you make for me.Excellent work you Done for me clean and tidy work i will tell my all frend if they wan't to make Driveway they should call you first I hope you gonna do my Another driveway soon Thank you sooo much again

We are a specialist company in all aspects of building works including extensions, garden rooms, garage conversions, landscaping, paving and groundwork’s company based in Northampton offering the highest quality workmanship. We have over 25 years of experience within industry and currently have an accomplished team of 30 employees, all of which are trained to the highest standard. We are currently looking to expand our portfolio and delve further into the domestic sector.

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Reviewed by Emily on 4/6/2024

Didn't come back to finish the jobs. I'm quite disappointed they didn't follow through until the end.

MJJ BUILDERS LIMITED .

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Reviewed by Kate on 7/7/2023

Great service, very quick response time, really helpful collecting and installing a new washing machine. Would highly recommend. Thank you

We have completed many high end projects with over 20 years of experience. We pride ourselves on making our clients happy and proud of their homes. We give a great service and are always here to help and give advice, no matter what time of the day it is. We have a strict policy on time keeping and making sure all the the finer details are meet for the client. Being polite and helpful has got us where we are today.

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Reviewed by Caroline on 23/2/2014

Very fast service, excellent value. Would highly recommend

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Reviewed by Russell on 18/11/2014

I commissioned Contemporary Interiors to convert my loft into a bedroom and shower room and to re-roof my house. The works were completed to a very good quality and the builder took great pains to ensure that the fit and finish was what I wanted. The various teams that worked on the project were helpful, hardworking and always willing to go the extra mile. This is a local company (North London) and I recommend it.

I am a qualified tradesman with over 30 years building experience in the London and surrounding areas able to undertake large or small jobs with confidence.

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Reviewed by Annika on 27/12/2013

James replied relatively swiftly. After assessing the job, James was able to start at a mutually convenient date. We were concerned that we'd have a potential issue in matching our mortar colour-shade but James put our minds at rest and surpassed our expectations. We've since called him back to do another job for us, which he did exceptionally well too. We'd have no hesitation whatsoever in recommending him. He's punctual, reliable, trustworthy and does a terrific job. Thank you James!

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Reviewed by Joshua on 17/6/2013

very good, they were on time, and they even waited for me to go to Ikea and get an extra part due to Ikea missing parts in the package. Would definitely recommend their services.

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Reviewed by bansri on 12/3/2013

griffin builders were flexible as the job went along. We made changes as we went along and he was absolutely fine with that. I have always seen him calm and willing to give advise and go out of his way to get us samples, etc. Never was he ever flustered and always in a good mood. He was always calm and approachable . Very good attitude and did an excellent job with no cutting corners. He had pride in his work and maintained high standards throughout. His knowledge of hard landscaping is second to none.

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Reviewed by Christine on 8/1/2014

Complete bathroom / shower room / cloack room refurb. Job wasn't done by Voytek himself and so we had issues, HOWEVER Voytek provided a first class after care and resolved ALL our issues to high standard at no additional cost!. Very reliable and honest, which is very hard to say about any tradesman after a job is completed. I would recommend Voytek no problem.

All types of plastering and rendering work, painting, decorating with a guarantee of good quality.

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Reviewed by Curtis on 11/1/2014

excellent service and work provided. job well done.

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Reviewed by mary on 19/7/2012

Most impressed, they were on time, veryclean and very effecient.....thank you.

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Reviewed by Alison on 23/3/2013

Efficient, friendly service and a quick, good job completed 2 days after I put my job on Rated People! I was very pleased.

We are a family business with 35 yrs of building.We are very hardworking/polite/clean and tidy. 95% of our work comes through recommendations.We have a large portfolio of works with many client references.All are work force our fully qualified. .

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Reviewed by Medha on 24/5/2014

It is a 5 star rating. He gave my stairs a new look. He started the job on time and completed on time. He did not leave any mess. Reliable. The oak stairs is just very elegant and chic. Thank you Sean. Highly recommended.

T Murphy Construction LTD is a family run business with over 30 years experience. We have a dedicated team of experienced and skilled tradesmen with City & Guilds qualifications. We have expertise in carrying out all forms of commercial and domestic work.

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Reviewed by Edward on 21/3/2014

Thanks Tom for a great job.

We are a family run company who strive to offer quality craftsmanship. From garden maintenance to plastering, everything is given the upmost care to give the client what they envisioned. It is paramount our customers are left 100% satisfied.

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Reviewed by Jean on 2/9/2013

Jack kept me informed at every stage, he and his team were professional, friendly, reasonably priced, worked hard, cleaned up and removed all rubbish and took a pride in their work. I was more than pleased with all the jobs they did for me and will be looking to book them for any work I need doing in the future. A very big thank you to them.

I am a highly skilled Bricklayer and General Builder based in Bedfordshire .Myself and my small team of men have gained an excellent reputation built upon quality workmanship reliability and trust.

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Reviewed by John on 28/8/2014

Prompt, efficient, and effective solution to drainage problem. Would certainly use again. John HP21

We are a small family business of qualified tradesmen that provide a professional service to a very high standard.

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Reviewed by marie on 20/1/2016

We decided to have a new kitchen fitted after seeing work carried out by Anthony & obtaining references from previous clients.The work carried out involved taking down a wall,blocking a door,installing bifold doors & a window.Also,altering electrics & plumbing to accommodate an island area which includes a sink & dishwasher.Walls & ceilings have been plastered & decorated,underfloor heating & floor tiles laid & spotlights fitted.We highly recommend this team & are beyond delighted with the work carried out

We are a friendly and reliable team who pride ourselves on providing high quality workmanship.We are devoted to our responsibilities towards customers and always deliver of high quality finish on time and to the budget. Our aim is “customer satisfaction”

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Reviewed by Paplu on 15/11/2017

Artur replaced our kitchen worktop and installed our integrated appliances. Artur is very a meticulous professional that understands your needs and your desired high quality end finish without you having to explain the job thoroughly. Artur had always been available for questions and is someone you can rely on for advise. I would highly recommend him

adam building & decorating company offers general construction including additions.the best service with emphasis on quality and details.we are commited to meeting our clients needs and ultimate satisfaction.Our service is available.

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Reviewed by Mia on 15/9/2014

Adam did a great job at my property installing blinds in the kitchen and repairing a wardrobe, I would not hesitate to recommend his services.

Small builder speacializing in extensions new builds an all building works steel works drainage

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Reviewed by Costas on 26/5/2024

Good clear & transparent communication, prompt & reliable, high quality work at a fair price - what more can I ask for. I highly recommend Danny. I would absolutely no hesitation in using Imperial Build again.

Quality is our job !

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Reviewed by Peg on 13/7/2016

Gerry and Dave are friendly and reliable. They painted our g/f really well and very efficiently so we could have our living rooms back quickly!

At Muja Builders LTD. We have over 22 years of wide ranging building experience, from ground-work to roof-work, with a main focus on extensions & conversions. We take the utmost pride in our work, delivering to the high standards we set ourselves. We are located in East London but are willing travellers

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Reviewed by Pagget on 12/10/2018

MUJA Plastering : Turn up on time stated . The work on the bedroom was A1 Class the best I have seen in ages . The walls are very smooth . Professional job done. The work area is cleaned up after each day work and house left in a clean reasonable condition when they have finished. I definitely will be getting them back for more work .

we are a construction and landscape company located in north London with over 10 years of experience in construction and gardening, and if you choose us, we will not disappoint you, thank you

Latest homeowner review

Reviewed by JENNIFER on 26/10/2024

Excellent work completed by Pin construction, communication was excellent throughout the paving and pergola work carried out. I have a wonderful garden thanks to Emile and his team. Everything was completed to a very high standard. Would highly recommend Pun Construction.

Bathroom refurbishment & installations rated as professional and excellent by several happy customers. Over 10 years experience.

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Reviewed by Rajeev on 30/7/2017

Tony and his friend Mario completed the bathroom full refurbishment on time. Work quality was very good at every level : starting from plumbing, tiling and final finishing. The rates were very competitive as well. Kept the house clean when the work was going on. Being impressed by his quality and openness, I gave them some additional work for my second bathroom. Overall I am very happy with his quality of work on competitive cost.

We are the Webb brothers Simon and Gary working together for over 20 years - Design & Planning - Building Construction - Specialist in Traditional & Modern Brickwork Techniques - Landscaping and Fencing Specialist - Masonry - Carpentry - Painting - Maintenance - Repairs

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Reviewed by Golden on 15/2/2024

Fairtrade builders

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Reviewed by Steve on 29/9/2021

Had a quote for roof repair which included for 1 missing tile, re fitting existing tiles, repairing flashing and gutter cleaning did not accept quote. On advice from another roofer just had the one missing tile replaced since there was no evidence of any leaks inside the loft or 2nd floor ceilings.

PRIMARY ASPECT LIMITED is a leading Construction company serving the London area. Ever since we opened for business, we’ve taken a comprehensive approach to project management, providing our clients with a wide range of construction and refurbishment services, to cover their needs. Get in touch today to learn more about what we can offer you and to receive your free estimate.

Latest homeowner review

Reviewed by Kate on 10/2/2025

Patrick was very helpful right from start. He was detailed in the initial quote and communication was easy and prompt. On the day he was very polite, clean and tidy, nothing was too much trouble. I would highly recommend.

Please contact Rob at Renovation Properties to discuss your requirements. Free, friendly, professional and helpful advice. Fully trained and insured. We look forward to hearing from you. Services Included: Extensions Home improvements Loft Conversions Plaster Boarding and Skimming Removing & Replacing Damaged Ceilings Plastering, All Aspects Exterior Rendering Damp proof rendering Repair work, cracks and holes

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Reviewed by Frances on 14/10/2024

I am very happy with the work done. The job was more complicated than I had thought but Rob allowed for that in his estimate. He also redecorated the room afterwards. He was polite, friendly, and efficient, clearing up and restoring the room to its former state.

Lion Construction are a friendly and reliable development, interior design and renovation contractors offering fully project managed services, design and build solutions and refurbishment contracting.

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Reviewed by Mark on 3/12/2020

Ivan was absolutely brilliant. Very helpful and accommodating when we found out more work was needed. Would certainly recommend to anyone looking for electrical work.

Skilled groundworker with over 25 years of varied experience, including block paving and drainage work.

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Reviewed by Carolyn on 6/11/2012

I would recommend Andy. He spent time evaluating the job required with a view to looking at less costly but effective options. Most of the time I was out at work, he called everyday when he was leaving to update me on progress. He communicated clearly and so there was no confusion with what the job involved and the final cost. He was also very nice to my dog. Thanks Andy.

HOUSE EXTENSIONS & LOFT CONVERSIONS SPECIALIST. Services include: structural works, electrical, plumbing, carpentry & general building. Professional team, including Gas Safe Engineer & Qualified Electrician. FEDERATION OF MASTER BUILDERS TRUSTMARK

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Reviewed by Michael on 19/11/2020

Excellent workmanship. Would highly recommend. Honest and trustworthy.

I am general builder specialist. More than 22 years experience.

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Reviewed by Rebecca on 17/1/2025

I dont normally book people with 1 review but im SO glad i did. I stupidly decided to board out my loft after decorating my whole flat. Niko quoted and started the next day. He was professional, respectful & his work is an excellent standard. They took extra care to protect my newly painted walls & floors. Niko was so good i employed him to do a whole house refurb elsewhere. There is nothing he can’t do & everything is done to a high standard at a fair price. I really enjoyed working w. Niko. 5 stars

Innov8 Projects is a forward-thinking construction company dedicated to delivering high-quality, modern, and innovative building solutions. With a focus on craftsmanship, efficiency, and sustainability, we bring visionary projects to life—whether residential, commercial, or bespoke. Our commitment to excellence ensures every build stands the test of time. Building the Future Today

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Reviewed by Philip on 16/9/2024

At present, our work is still in its early stages, rectifying 90 years worth of previously bodged jobs. The CBA Team have been excellent so far, they arrive on time, work hard and do things the right way. I will be using them again once this project completes.

My names Tom, I have been in the real estate sector for over 10 years and have done everything from general property maintenance, new bathrooms, painting/decorating, demolition contracts and most recently constructed 9 ultra high spec homes. High quality and impeccable workmanship are key values to me and ensuring the client is satisfied and more with the work they are receiving. I have decided to further expand and diversify my business reaches and so my rated people account is new, however my experience in the industry is far from that. I am very well connected with all trades and can provide a top tier service for all types of project management no matter how big or small the job may be. I am also extremely capable at doing many manual labour jobs, but often favour a shorter timeline for my clients project completion and therefore prefer to draft in experienced trades to get the job completed. Above all I am very friendly, well spoken and always keen to deliver what is asked of me.

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Reviewed by Ian on 22/4/2025

The person did a superb job . Highly recommended.

At AG Property Services, we take pride in being your trusted partner for all your residential construction needs. With over 15 years of valuable experience in the construction industry, we have honed our skills and perfected our craft to deliver unparalleled building services tailored to enhance your home. Our primary commitment is to provide quick and reliable solutions, understanding the importance of your time and the urgency of your projects. Whether you're considering renovations, additions, or general maintenance, our team is dedicated to delivering prompt and dependable services that meet and exceed your expectations. What sets us apart is our unwavering dedication to quality. With a rich history in the construction sector, we bring a depth of knowledge and expertise to every project we undertake. You can trust AG Property Services to deliver high-quality results that stand the test of time. We understand that budget considerations are crucial, and that's why we offer our clients the assurance of affordable prices without compromising on excellence. Our commitment to cost-effectiveness ensures that you receive top-notch construction services without breaking the bank. Choose AG Property Services for a seamless blend of experience, reliability, and affordability. Let us transform your house into the home of your dreams with our trusted building services. Your satisfaction is our priority, and we look forward to making your vision a reality."

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Reviewed by Terry on 5/6/2025

Arthur was very professional, friendly and helpful. If there was a problem he solved it with a calm manner. He turned our dowdy dated bathroom into a beautiful hotel worthy space. We would absolutely recommend him in a heartbeat. What can I say he is so hard working, tidy and friendly.

At C webb property maintenance we provide our customers with respect and manners. We pride ourself on our high quality work and competitive prices. We cover most aspects of construction and can always find time to meet our customers to discuss any jobs. Our reviews speak for them selves We look forward to working with you

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Reviewed by James on 6/7/2022

An builders & refurbishment We do all aspects off building trades To a good standard We have good team players from blokes to women Thank you so much for looking and using our services

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Reviewed by maria on 18/2/2025

Very efficient service from the initial contact to finishing the job. Polite, professional and efficient. I would highly recommend. We definitely be using them in the future.

Arch-con limited

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Reviewed by Morag on 7/6/2025

Work was completed professionally and efficiently, thank you.

A Romans Scaffolding Ltd we provide our clients with the highest level of service with the best prices available Satisfaction is our aim!!! All size jobs undertaken , references and reviews to match :-)

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Reviewed by Terry on 7/6/2025

Outstanding service very competitive Prices . Punctual and turned up on the days they said . Recommend this firm to everyone .

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Reviewed by Grania on 9/2/2012

Very quick response and good quality repair at reasonable price

Latest homeowner review

Reviewed by Matthew on 17/6/2011

Marisuz was excellent - he was prompt and grafted all day. He did a great job.

willow brickwork I have been a qualified bricklayer for over 7 years with a level 3 NVQ. I also went to anglia Ruskin university and gained a foundation degree in construction management. I have worked on many different large and small sites with various different sub-contractor brick work companies. I still work for a large contractor company and and looking to take on other work on my weekends (work I quote on here I will only be able to complete on weekends) so I am looking to take on small brick work projects such as garden walls, brick sheds, brick barbecues etc. Work I can compete in a weekend. I pride myself on quality and neatness of work and to never leave a job until the customer is happy. Im always polite, tidy and try to keep any inconveniences to a minimum. I also use another website to gain work and have gained 100% positive feedback which I am very proud of and aim to keep it that way!

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Reviewed by Marco on 2/4/2019

Will update on completion

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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

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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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