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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 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

Latest homeowner review

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!

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.

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.

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.

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

Welcome to Opuluxe Building and Damp Solutions! With over a decade of specialising in the damp proofing industry and expert plastering services, our company has built a solid reputation for delivering dependable, high-quality solutions. As a family run business, we are a dedicated and professional team known for our reliability, strong work ethic, and attention to detail standing out from the larger companies! We take great pride in maintaining a clean, safe, and presentable work environment on every project. All of our work is backed by a comprehensive 15-year guarantee, ensuring long-lasting protection and complete peace of mind for our clients.

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Reviewed by Andrew on 1/7/2025

Very good standard of workmanship. Paid good attention to detail and friendly. Price was as initially agreed. Recommended.

Arch-con limited

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Reviewed by Roberto on 1/8/2025

Very friendly, trustworthy and fair priced handyman. He went above and beyond to complete a tricky job. Very happy with the service will happily use again. I Highly recommend.

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.

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.

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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.

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 .

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.

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.

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.

My team has been working in construction industry for 15 years. We have a good experience in this field. we work to the highest NHBC standards,

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Reviewed by Ben on 15/6/2025

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!

Latest homeowner review

Reviewed by Camille on 18/8/2022

Great service, would use again.

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 Simon on 26/8/2025

Latest homeowner review

Reviewed by Grania on 9/2/2012

Very quick response and good quality repair at reasonable price

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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

15 years of experience of General building works and house maintenance. Specialising in Roofing, Plastering, Brickwork and much much more..... Professional service throughout.

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Reviewed by Andy on 25/5/2019

Quick, efficient service. Very happy with work. Would recommend

With over 20 years of experience in construction we want to get your project from conception to completion. Fast, trustworthy and efficient.

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Reviewed by Jermaine on 25/8/2020

Absolutely amazing tradesmen with very competitive pricing. transformed my 50m2 Driveway by tilling and installing aco floor drainage, great attention to detail and great finished product. Very highly recommended and definitely will have them returning for more work.

Our purpose is to provide our customers high quality work at an affordable price!!

Latest homeowner review

Reviewed by Milan on 4/1/2020

Excellent work carried out to a high standard. Went above and beyond expectations and will definitely recommend and use for my next project. Thanks for completing the job in a professional and very timely manner. Much appreciated

We are ssmART Build & Design Ltd. Our team pride themselves on We are ssmART Build & Design Ltd. Our team pride themselves on their diligence and painstaking attention to detail. We are a seasoned team of quality builders who have been helping homeowners London area for some time. We have an experienced and disciplined team who have completed many projects throughout our area of operation; indeed we can help you complete all types of home improvements and extensions/conversions. We pride ourselves on our impeccably high standards and always strive to deliver on time and within budget. We can help with all of the following and more: • Extensions (both single and double storey) • Loft Conversions • Basement Conversions • Garage Conversions • Kitchens • Bathrooms and wet rooms • Exterior and Interior painting and plastering • Plumbing, electrical work and carpentry • Annexes • Replacing both wooden and PVC doors and windows We are always delighted to meet our prospective customers face to face to discuss their requirements. We look forward to hearing from you soon.

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Reviewed by Florin on 15/7/2019

I found Lorand to be very professional in his craft ,friendly individual and very reasonable priced. I would highly recommend his work in extensions,brickwork etc.

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Reviewed by Lynda on 23/8/2010

The job was done very quickly and efficiently and for a reasonable price. We are very pleased with the quality of the work.

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Reviewed by kudzai on 8/11/2011

very good service

S G BUILDING & Son is a family run business with over 30 years experience, covering building and general roofing. We offer a competitive, honest and reliable service, and are committed to developing a trust between the company and its customers. All our customers are offered a free quotations, all our work is guaranteed and a RAMS certificate (HEALTH AND SAFETY)is issued for each job.

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Reviewed by Daniel on 16/10/2023

Simon was very knowledgable with a wide range of skills, took the time to understand the issues faced and delivered a high quality solution. Great guy to deal with & quick communication when I had queries, would recommend to anyone.

upvc sash window specialists covering all aspects of double glazing, highly competitive and hassle free sales. Showroom open in Harlow Essex.

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Reviewed by Alice on 20/5/2019

Great team, professional and friendly, but more importantly did a great job!

We are professional building company based in London. We have worked in the building trade for many years. In this time we have amassed a wealth of skills and experience. We pride ourselves on being a professional, reliable and trustworthy team who cover all the bases when it comes to building work.

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Reviewed by Peter on 23/2/2020

Very happy we hired MC to do the job professional throughout the job and finished very quickly. I would highly recommend these guys if you're looking for a top level of work I will be using them again In the future.

Hello, my name is Sergiu, I’m a professional multi skilled refurbisher. I’m happy to complete quality jobs for all homeowners that are interested in my services. We are a small team that can complete a various range of jobs (ventilation, duct fitting, air conditioning, plumbing, carpentry, painting, decorating, tilling, professional cleaning). I believe that with the professional skills that we possess and the experience that we have, we’ll prove to be qualified to complete any challenge and to make our customers happy. I have an experience more than 6 years in plenty refurbishment projects. I will consider myself lucky to make your property look better. Don’t hesitate to contact/hire me and I will give you good quality work for competitive prices.

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Reviewed by Melisha on 31/7/2024

Friendly and professional. Dismantled furniture efficiently. Would highly recommend

Best possible work, honesty is my main moto. I don't cheat with my customer. I always try to make my client happy.

Latest homeowner review

Reviewed by Aneil on 25/4/2021

Saleh was great, even thought the job took longer than expected and we had to go to two locations. Salah was very flexible and did not complain. He got on with the works and was very pleasant. I would recommend him to anyone and would use him again. Thank you Salah!

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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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