Extension Builders in Southfields

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.2 (22 reviews)

Easily find verified Southfields Extension Builders. Just post your job to get quotes from MyBuilder's Extension Builders in Southfields.

Select a service

How it works

Post your job for free

Tell us about your job, and we’ll alert suitable tradespeople in your area. It’s simple and free.

Tradespeople respond

Once your job is posted, you’ll get responses from interested tradespeople through the website.

Review profiles and choose

Browse profiles, work history, and feedback, then choose who you wish to share your details with.

Some of our top rated extension builders in Southfields

3389 Results

Sort by:

B&D Construction London Ltd
Rating: 5 out of 5
Extension Builder in Southfields
Hi Our company undertake jobs ,Loft Conversion, Extensions, Carpentry, Gardens, Plumbing/Electrical , Plastering and Decorating,
Get in touch
Latest review:
We’ve had multiple jobs done by Silviya. The first was a small extension and downstairs and partial upstairs refurbishment with new kitchen and 2 bathrooms fitted. This large job was completed within 16 weeks and looks exactly as we hoped. Given the extent of works we moved out for the build. The second was the construction of an outbuilding and garden redesign (patio and astro fitted). Again the results are great. We lived in during this project and I worked from home without disturbance. The latest has been the re-fit of new windows, front door and fixing the front render. Again, the results are very professional and minimal disturbance while the work took place. Will definitely use him and his team again, should we need any more building work and recommend them to others
Pavlito Construction Ltd
Rating: 5 out of 5
Extension Builder in Southfields
Pavlito Construction Ltd is a family run business with over 15 years of international experience in construction and general building (Germany, Italy, Poland and UK). We have worked extremely hard in order to establish a well respected name and reputation.
Get in touch
Latest review:
Restoration & Refurbishment- 15 Feb 2016
Pawel and his team modernised our two bedroom house from top to bottom. They installed central heating in every room, they removed our old warm air heating, made an open plan for the kitchen and living room area, installed new bathroom and kitchen units and did the tiling too, they updated our electrics and sockets and also plastered and painted the walls and fitted our wooden flooring for downstairs. The job was completed within 12 weeks. We were very happy with the modernisation, our home looks completely different and has a new modern fresh feel. We will definately be using Pawel and his team for future jobs. Thanks again Khalima
SGB Water Engineering
Rating: 5 out of 5
Extension Builder in Southfields
SGB maintain an interactive IT process, to ease transparency and movement of information data, to all parties involved in any one project. We have a combined 25 years professional experience in the civil engineering / construction management. We are experts in water utilities management enabling us to offer a variety of services and solutions in this area.
Get in touch
Latest review:
Plumbing- 9 Dec 2020
Work completed and problem has been resolved .
Signature 1 Construction Ltd
Rating: 4.5 out of 5
Extension Builder in Southfields
Signature 1 Construction LTD is a family run business with over 25 years experience in the building industry. We specialise in extensions, loft conversions and full house refurbs. Every job we undertake we take great care of the clients house and are experienced project managers will look after you from start to finish.
Get in touch
Latest review:
Extensions- 30 Sep 2025
Overall, I’m very pleased with the work Marin has carried out for us and I’m currently in the process of instructing him to do more work. Marin built a high spec cedar shed for us with electrics and plumbing, some brickwork and laid composite decking. Marin came across, honest and reliable, which in itself is rare. He was on site most mornings to make sure his tradesmen were on the right tracks. Like with a lot of these things there were some issues along the way and I was highly impressed by Marin’s ‘no quibble’ approach to rectify any problems. I myself have a high attention to detail and am quite indecisive (nightmare client) and Marin was happy to work with me with changes to the project without incurring extra costs.
Venus Constructions Ltd
Rating: 5 out of 5
Extension Builder in Southfields
Hi, thanks for taking time reading.. our team at Venus Constructions specialises in all types of residential works and our range of services covers complete refurbishment, conversions, external buildings, patio, turf, driveway, decking, fencing, brickwork, blockwork, rendering. Depends of team member we have years and the necessary experience based on the works needed. Listening to the clients needs we assure with punctuality high quality results and workmanship of our friendly team.
Get in touch
Latest review:
Landscaping- 28 Mar 2022
Gianni and his friend did an amazing job on our garden grass and planter. They came to see the garden before providing us with the quote. They were very professional, punctual thorough and quick. We were very impressed that they started the job the following day and that they were able to provide all the materials. We will definitely recommend them to friends and family.
Plastering and painting services
Rating: 5 out of 5
Extension Builder in Southfields
Small family business with years of experience in : *Plasterering@external house insulation, k render, silicone render, sand cement render, damp proof render, skiming. *painting and decorating *tiling /bathroom refurbishment All work will be carried with great quality finish in a tidy manner with best prices you can get on the market.
Get in touch
Latest review:
Wow, what a service. Needed a room and a half done quickly, Ady responded immediately and gave me his quote and said he could do it straight away. He blew the other quotes out the water, 12 hours later he was at my door material the lot, no fuss just got on with it. Would highly recommend him to anybody looking foe an excellent plasterer. Thanks again Day.
REVOSPACE CONSULTING LTD
Rating: 5 out of 5
Extension Builder in Southfields
Revospace – Building Better Spaces Revospace delivers high-quality refurbishments and property improvements across London and surrounding areas. With years of hands-on experience in residential projects, we understand how to combine strong workmanship with structured project management to deliver results on time and within budget. We have worked on full refurbishments, kitchens, bathrooms, flooring, carpentry, decorating and general building works. Our background in site management means we don’t just complete jobs — we plan, coordinate and manage them properly from start to finish. Based in London, we operate across Greater London and Essex, and are happy to travel for the right project. Our strengths include attention to detail, reliable scheduling, transparent pricing and clear communication throughout every stage of the job. We respect your home, keep sites clean and ensure work is completed to a high standard. At Revospace, we believe in doing things once and doing them properly — no shortcuts, no hidden surprises. Quality work. Clear communication. Professional delivery.
Get in touch
Latest review:
I recently had a full kitchen installation carried out and I’m really pleased with the results. From start to finish, the work was completed to a high standard and everything was done with great attention to detail. The installer was professional, punctual, and easy to communicate with throughout the project. Any issues or questions I had were dealt with quickly and clearly, which gave me confidence that the job was in good hands. The workmanship is excellent – everything is level, neatly finished, and exactly as discussed. They also kept the workspace tidy each day and made sure everything was cleaned up properly once the job was complete. The kitchen looks fantastic and has completely transformed the space. I would happily recommend them to anyone looking for a reliable and skilled kitchen installer, and I would definitely use them again for future work.
Justas Kusak
Rating: 5 out of 5
Extension Builder in Southfields
I'm a self employed roofer for more than 14 years now. Roofing specialist you can rely on. 10 year Warranty for work. EPDM, GRP, Felt, RESITRIX, Kemperol, lead, slates, tiles, skylights and more...
Get in touch
Latest review:
Fascias & Soffits- 19 Aug 2019
Very happy with the work Justas did, house looks much tidier with the new fascias and guttering. He arrived on time, quoted a fair price and did a good job. I would happily recommend and hire him again.
JANBA constructions Ltd
Rating: 2 out of 5
Extension Builder in Southfields
Janba Constructions is a trusted, family‑run company with 11 years of dedicated service and over 18 years of hands‑on industry experience. I specialise in high‑quality extension work, general plumbing, handyman services, driveways, and a wide range of general home improvement jobs. My approach is simple: reliable workmanship, honest communication, and a commitment to getting every detail right. Whether it’s a small repair or a full extension project, I bring the same level of care, skill, and professionalism to every job. Customers choose janba Constructions because they know the work will be completed to a high standard, on time, and with pride. If you’re looking for someone experienced, dependable, and genuinely passionate about improving homes, Janba Constructions is here to help.
Get in touch
Latest review:
Handyman- 20 Mar 2026
Not happy with, he was told to sand down paint on metal spiral staircase in the garden. Since I couldnt check before dried out I noticed paint peeling off, plant broken, garden door with spot of pain .Since I was short woth paint je went and bought another tin of paint which is primarily for wood. Proce tag £200 without paint, borough brush from me and roller
Dagat Ltd
Rating: 5 out of 5
Extension Builder in Southfields
DAGAT LTD is an established family-owned property development and refurbishment company who have been successfully trading in the South East of England. Whether we are constructing a new bespoke property, beautifully re-developing a home, or carrying out extensions of all shapes and sizes, each project always receives the same thoughtful and meticulous attention to detail. We are additionally able to provide an extensive range of commercially orientated projects having worked for a wide range of industry sectors. We strive to create a mutually beneficial close working relationship with our clients and / or their management team. We can either complete a project from the initial planning stage or work from an architect’s plans. Our pride in working all the way through to a beautiful finish has been a major contributory factor in our success.
Get in touch
Latest review:
Conversions - General- 3 Sep 2025
Big refurb of 1650 sq ft flat, plus building 2 additional ensuites. Initial quote seemed reasonable but then once in, costs started to rise exponentially. Some work was done well, like the building component and flooring, but finishing was poor. Painting, particularly of internal doors, was done poorly, without removal of fittings first, so lots of overpainting and insufficient prep and coats. Regrouting and redecoration of front and rear patios was done poorly, with weeds already poking through. There was damage to existing bathtubs and WCs by not protecting surfaces and pouring waste materials down the pan. Everything was an argument with constant demands for more money e.g. front door only painted one side as the other side not included under "paint door". Lots of "snagging" - I only have manual on/off control of heating and hot water as "smart" thermostat won't connect, there are odd water pressures through some fixings...and now there's a leak under one of the WCs...
k+c studio
Rating: 5 out of 5
Extension Builder in Southfields
udrtzurtszesrtz
Get in touch
Latest review:
CAD / Drawings- 5 Dec 2021
So far so good very helpful and would use her again very professional
Coulsdonbuilders Ltd
Rating: 5 out of 5
Extension Builder in Southfields
Coulsdon Builders has been successfully making home improvements for over 15 years. We are ready to fulfill your needs as a builder. Whether you desire a full renovation to create your new dream home or home improvements or general enhancements to add value and space to your property, we are here to assist as a contractor. Coulsdon Builders can propose and carry out the best building solutions for you to achieve your building goals, within your budget and in a short time-frame.
Get in touch
Latest review:
I wanted a side infill extension, converting a one bed into a 2 bed. The works was undertaken by Coulsdon Builders which took around 8 months. I made several changes throughout the project hence the delay. They were so accommodating and never had an issue and was always happy to cooperate. The cost of build was £120k and we stuck to the budget. I am delighted with the works and am grateful they made my house a home. They were clean and tidy on a building site and always kept me updated on progress. This is one builder that I highly recommend and trust. Great work guys and thank you again!
Wall Done SP
Rating: 5 out of 5
Extension Builder in Southfields
We believe your home should evolve with your lifestyle. Whether you're expanding your living space with a loft extension or completely renovating your property, we turn your ideas into reality.
Get in touch
Ben the builder
Rating: 5 out of 5
Extension Builder in Southfields
Extension Loft conversion Landscaping General building work
Get in touch
Latest review:
Benny and his team rebuilt our bungalow to our architect's design. Complete internal reconfiguration, refurbishment and insulation (internal and external), extension, new bathrooms, kitchen; detached garage, outbuilding and landscaping. His pricing was very fair. His work outstanding. Very reliable, utterly trustworthy, courteous, very helpful and professional. Answered our prayers and cannot be recommended highly enough
Tota Builders
Rating: 5 out of 5
Extension Builder in Southfields
Tota Builders are a polite and hard working team, Qualified tradesman, we do commercial and domestic jobs, Our goal is to leave our clients happy with high standard work, We are allso checkatrade approved,and we have been with them for 4 years,
Get in touch
Latest review:
Carpentry- 23 Nov 2019
Carpenter showed-up on time both days and finished the work ahead of schedule. Nice people and dedicated carpenters. Before living, they cleaned-up all the area and left everything tidy. I would recommend Toptan Tota and would hire them again.
South &East London Builder's
Rating: 3.7 out of 5
Extension Builder in Southfields
........We are specialising Bathrooms and kitchens fitters,Handymen,paiters,plumpers, electricians,Flooring Fitters,all house refurbishments .Our work is completed to High standart and home left clean and tidy,friendly service. Also we do Extension Lofts Roofing Plastering Sounds proofing Damp proofing And many other trades Don't hesitate to contact us for any jobs small or big we are available 24/7 free quotation Many thanks
Get in touch
Latest review:
Extensions- 6 Mar 2023
Valerian unfortunately let me down dreadfully. He agreed a price we signed a contract but then decided to walk off site once it became clear he was unable to do plumbing work. He refused to assist in appointing another contractor and didn't pay his own workers.

4.2

Top rated Extension Builders

Our Extension Builders in Southfields, are rated 4.2 out of 5 based on 22 reviews from customers like you.

Quality screening

Easily find verified local tradespeople. Just post your job to get quotes from tradespeople near you across the UK.

What types of services are offered by local extension builders in Southfields?

Building an extension is a major milestone for any home. It’s not just about adding extra space, it’s a big step that can transform how you live day to day, opening up new possibilities for comfort, lifestyle, and family needs.

This is why it’s so important to find the right extension builders in Southfields for you. They can help with a variety of tasks and projects, including:

Extending your home with an extra room
Two+ storey extensions
Adding partition walls to create more rooms
Building annexes or external structures

To find the right extension builder near you, simply post your job on MyBuilder. Explain the type of help you’re looking for, and then home extension builders in Southfields who are available and interested can respond to your post.

Browse profiles, read customer reviews and get quotes from your chosen Southfields extension builders, all before you decide who to hire.

What are the hourly rates of extension builders in Southfields?

Before getting started with your extension project, it’s important to have a clear budget in place. On average, extension builders in Southfields will charge between £16 and £42 per hour.

Single-storey rear extensions cost between £20,000 and £60,000 depending on size and finish.
The cost of double-storey extensions, which add more space and value, can range from £100,000 to over £170,000.
Larger wrap-around extensions that combine multiple extension types can range from £40,000 to over £120,000.

The cost of an extension will vary depending on your property. For instance, extending in certain areas may require structural adjustments to ensure stability, which can increase your material and labour costs.

To get an accurate price for your home extension, request detailed quotes from several Southfields extension builders near you on MyBuilder. This allows you to compare what each quote covers and how much your Southfields home extension project is likely to cost.

Find extension builders in Southfields with MyBuilder

Hiring the right extension builder in Southfields with MyBuilder couldn’t be easier. Just follow these simple steps:

Step 1: Post your extension project on MyBuilder

Whether you’re planning a single-storey extension, a loft conversion, or adding a new room, post your job on MyBuilder to find local Southfields extension builders. Once your job is live, we’ll share it with home extension builders in Southfields who can express their interest.

Step 2: Compare different extension builders in Southfields

When you start receiving interest, review profiles of local Southfields extension builders, check their previous work, and read real customer reviews. Ask about timelines, materials, and request detailed quotes.

Step 3: Hire Southfields extension builders with confidence

After gathering all the information and quotes from your chosen home extension builders in Southfields, compare their experience, guarantees, and costs before choosing who to hire.

You’ll also have confidence knowing that every tradesperson on MyBuilder is verified through several checks, including:

ID verification: When a tradesperson joins MyBuilder, we ask for a valid ID, such as a passport, ID card, or eIDAS certificate.
Company verification: For tradespeople operating under a company, we make sure every tradesperson has a registered business.

Did you know? Our continuous monitoring and complaints process ensures that tradespeople who don’t meet our standards are promptly removed from MyBuilder’s platform.

Southfields extension builders are ready to help. Use MyBuilder today to find the right professional for your home extension.

What to ask a Southfields extension builder before hiring?

Before hiring an extension builder in Southfields or extension building company in Southfields, ask a few key questions to make sure you’re choosing the right professional for your home extension project.

What qualifications and experience do you have as an extension builder in Southfields?

An extension builder in Southfields should have a strong track record with similar projects and relevant building qualifications or trade memberships, such as the Federation of Master Builders (FMB) or TrustMark.

Will my home extension meet all building regulations and planning requirements?

Your Southfields extension builder should ensure the project complies with Building Regulations and, where necessary, handle or assist with planning permissions. Ask how they manage building control inspections and what documentation you’ll receive once the project is complete.

What experience do you have with similar extensions in Southfields?

Ask to see examples of their previous work, or view examples of their work on MyBuilder. Ideally projects similar to yours in scale and design. This helps you assess the Southfields extension builder’s ability to deliver a result that meets your expectations.

How long will the extension take to complete?

Extension project timelines can vary depending on size, complexity, and weather. A typical single-storey extension might take around 8 - 12 weeks. Request a detailed schedule so you know what to expect and when key milestones will be reached.

Do you offer a guarantee for your work? Most Southfields extension builders offer a guarantee or warranty on their work, often between 1 and 10 years depending on the project and materials used. This gives you assurance that any issues will be resolved after completion.

If you still have questions about the professional you are looking to hire, we have a full detailed guide on hiring the right builder here.

FAQ: Common questions about home extensions in Southfields

Can an extension builder in Southfields help with planning permission?

Yes, many extension builders in Southfields can guide you through the planning process. They can help prepare drawings, advise on local requirements, and liaise with your local council to ensure your project meets all necessary regulations.

Can an extension builder in Southfields handle everything from design to construction?

Many Southfields extension builders offer full design-and-build services, managing both the architectural planning and construction stages. Ask your builder whether they can provide a complete package or if you’ll need to hire an architect or designer separately.

Will an extension builder in Southfields help with materials and finishes?

Yes, most extension builders in Southfields can source materials and offer advice on finishes that suit your design and budget. You can also choose to supply certain materials yourself, just make sure this is agreed upon before work starts.