Extension Builders in Portsmouth

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.6 (7 reviews)

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

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 Portsmouth

522 Results

Sort by:

Havant Carpentry
Rating: 4.9 out of 5
Extension Builder in Portsmouth
I have been trading as a company for 30 years. All off my team have been in the trade over 15 years plus. We take on many types of contracts, from private customers to contract works. We work for builders & property developers. We are all apprentice served & carries a cscs card. We carry out any form of carpentry work from roofs, floors kitchens, & doors.
Get in touch
Latest review:
Kitchen Fitting- 1 Feb 2025
Fitted Kitchen very well and was quick . I also hired them for my skirting board boards and new doors. I’m very pleased with the service.
1st Garage Conversions
Rating: 5 out of 5
Extension Builder in Portsmouth
Hello, I'm Gordon from 1st Garage Conversions, we are a local firm based in Denmead specialising in garage conversions. With 20 years experience in converting garages we could be just what you`re looking for. I would like to give you a free quote. Thank you
Get in touch
Latest review:
Conversions - General- 15 Dec 2025
Really great job done by 1st Garage Conversions. Very polite friendly team who worked hard in al weathers to get the job done. Would recommend!
RBA Builders LTD
Rating: 5 out of 5
Extension Builder in Portsmouth
Rba Builders Ltd are a team of highly skilled and trustworthy builders and tradesmen which have many years experience in new builds, constructing home extensions, loft conversions, basement conversions and refurbishments . We are a dedicated building company with a diverse portfolio of projects in residential sectors.
Get in touch
Latest review:
Construction of new 4 bedroom house where RBA Builders Ltd was the lead contractor. Remigiusz led the team and was extremely reliable and professional at all times. The project was completed to a high standard and I would have no hesitation in recommending Remigiusz and RBA Builders Ltd for any future projects.
Heron property services
Rating: 5 out of 5
Extension Builder in Portsmouth
Hi my names Dan, I’ve got 10+ years experience of installing woodburners and adapting homes to suit. I undertake all aspects of home maintenance and repairs, with a friendly, honest and reliable approach.
Get in touch
Latest review:
Fireplaces & Flues- 13 Jul 2024
Dan was fantastic, from first communication to completion. What was a tired old eyesore of an electric fireplace, is now a thing of beauty and really the focal point of the room. Transparent pricing, with careful and thoughtful work carried out. Dan's knowledge and skills made, what could've been a long complicated, messy project, look a quick and easy, which I'm sure (and know it was not). Would recommend in a heartbeat. Top work and can't wait to get a real fire going in there soon.
Miller Lifestyle Builders
Rating: 5 out of 5
Extension Builder in Portsmouth
Miller Lifestyle Builders are experts with a wealth of experience in installation of custom built garden rooms/summer houses/office/entertainment rooms, conservatories, extensions and providing general renovation services. Transforming your living space, lifestyle and leisure time by managing and executing bespoke projects of any size including: Garden Rooms Extensions Groundworks/patio Conservatories Orangeries Porches Garage conversions Refurbishment Knock-throughs Plastering
Get in touch
Latest review:
Extensions- 26 Jul 2024
Genuine person. He offered to carry out the job at a fair price. He always answered our calls, cleared his calendar for our side extension and started it on the day he told us. He is skilful but was honest if something was outside his expertise and asked us to hire the relevant person. Unfortunately, we encountered some difficulties, and the project could not be completed. would recommend working with Brendan
Alive Building Solutions
Rating: 4.9 out of 5
Extension Builder in Portsmouth
We take pride in our work and in what we do. Attention to detail and a high quality finish is our policy. We work along side all our clients to get the results they want. We also offer a 5 year workmanship guarantee to our work. We also offer other works.
Get in touch
Latest review:
Bathroom Fitting- 16 Apr 2026
Very happy with the work, would recommend 5⭐️
MAINFIX PROPERTIES LTD
Rating: 5 out of 5
Extension Builder in Portsmouth
Building company who cover all domestic and commercial interior and exterior works. Aspects include kitchen,bathrooms,extesions and all refurbishments works
Get in touch
Latest review:
Restoration & Refurbishment- 13 Apr 2023
These guys massively exceeded my expectations. Really good work, easy to deal with and very helpful questions and support.
Trevor Beech Your Builder
Rating: 5 out of 5
Extension Builder in Portsmouth
Your Builder is a full-service building work provider run by Trevor Beech, who has over 40 years of experience in the building trade. We offer building and renovations as well as full building design and planning services throughout Hampshire and Dorset. Free fully itemised estimate and advice.
Get in touch
Latest review:
Having just moved into a 3 bedroom house, where one of the bedrooms was far too big for my family's needs, Trevor converted the large bedroom into two smaller ones, thus creating a 4 bedroom home. Everything about the job was undertaken with great care and diligence, the workmanship was of excellent standard, everything was done within the time frame set out and all of my questions and queries were answered in full throughout. Trevor was completely professional throughout the whole process even when I changed my mind about a couple of things.
Skyline Southern Limited
Rating: 5 out of 5
Extension Builder in Portsmouth
We have been in the construction industry over 40 years and have completed projects all over the south of England.
Get in touch
Latest review:
Extensions- 11 Feb 2022
We had to wait a few months before Rick and Lee could start, as their previous job overran. However, we're so glad we did! From start to finish they were an absolute joy to work with. Nothing was too much trouble for them and they always advised us the best way to go about things. They are a definite credit to the trade. The job is now complete and we're just waiting for the sign off from the Council. We can't recommend Skyline Southern enough. If you find Rick is booked up, that's because he's in high demand, for obvious reasons. My advice is be patient and wait, it will definitely be worth it in the end. Thank you Rick and Lee for a fantastic job!
Your builder ltd
Rating: 5 out of 5
Extension Builder in Portsmouth
Your builder is a local building company based in Waterlooville. Over the past few years we have done many projects. Some of the main developments we have done is a plot of 5 houses with 6 student flats in Portsmouth, a block 17 flats in Fareham, The interior fit out of 9 houses in Botley and two million pound houses in Emsworth. Amongst these we have done many refurbishments and smaller domestic jobs.We are also approved bathroom and kitchen installers for wicks (the DIY store).
Get in touch
Latest review:
Extensions- 31 Aug 2020
Luke and your builder ltd done our back and side utility room. Even though we’ve had lockdown and COVID 19 they done a great job. I’ve used your builder ltd a few times and the quality of work is of the highest order. What they quoted before they started is what I paid. Couldn’t be happier with the end product. Completely transformed our house. Would highly recommend them.
Floyd building services ltd
Rating: 4.5 out of 5
Extension Builder in Portsmouth
We are an established local building company with reliable and trustworthy tradesman who work directly for us and have been with us from the start of our company. We aim to assist the clients with every project they require with efficiency and professionalism from the very first meeting to the completion of the project.
Get in touch
Latest review:
Extensions- 16 Jun 2025
From start to finish Ron was a breath of fresh air and a master of all building matters. The job took a while as we were a small project between major building jobs they in process off. Also having to wait for third party plumbers and electrician availability. Overall we are very satisfied with the work completed and would recommend to others. Thanks guys
L c maybery
Rating: 5 out of 5
Extension Builder in Portsmouth
Now formly known as kestrel property developments Ltd. Im a bricklayer with 10 years experience in mainly domestic building works. I have a level 3 city and guilds qualification in bricklaying earned at fareham college I can undertake work such as extensions, garden walls,patios,repointing, fencing and any brickwork maintenance driveway and renovation Please check my Facebook page kestrel property developments ltd for work that I've completed.
Get in touch
Latest review:
Extensions- 27 May 2026
Luke and the team were great to get on with and did a great job building a brick porch at the front of my property. We had some unexpected challenges but the team stuck with it to successful completion.
Cripps Construct Ltd
Rating: 5 out of 5
Extension Builder in Portsmouth
Cripps property services has 20+ years experience in the construction industry and specializes in many different categories from extensions to plumbing, electrics, gas, bathrooms, kitchens, heating, windows and doors, the list goes on. We aim for our customers to deal with one contractor to undertake the complete job and take away any stress or organisation and preparation. One call does it all!
Get in touch
Latest review:
Michael refurbished my kitchen, bathroom, hall, forecourt and back garden over a period of about two years. He was full of suggestions, but also listened to, acknowledged and acted on my instructions at all times. The work he did was excellent and he remains my go-to when I need work doing. Always polite, always available, always reliable.
Paving 2 point landscapes limited
Rating: 5 out of 5
Extension Builder in Portsmouth
We are a small landscaping company based in hampshire with over 15 years experience. We carry out the following works:- Patios Natural timber & composite decking Driveways Artificial grass Turf Fencing
Get in touch
Latest review:
Driveways (Paved & Loose)- 30 Jul 2025
Matt from paving 2 point landscaped the front drive with block Pavia and gravel. the work was carried out very efficiently and was completed in the time scale provided. a great job at a very good price. would definitely recommend paving 2 points to anyone looking for a landscaper. *****
Warner Carpentry Limited
Rating: 4.5 out of 5
Extension Builder in Portsmouth
My business concerns all aspects of carpentry and construction, I am a fully qualified carpenter and joiner with over 25 years of experience in both domestic and commercial construction. I have worked on new build construction as well as house refurbishment and renovation. My company aims to achieve the highest standards and service from hanging a door, bespoke kitchens, wardrobes to complete buildings and extensions.
Get in touch
Latest review:
Carpentry- 24 Jan 2017
Cancelled job. Will be looking to go through another contractor due to changing prices and minimal communication following site visit.
Philip Doyle Carpentry
Rating: 5 out of 5
Extension Builder in Portsmouth
In the trade 20+ years. Can travel. All aspect's of carpentry and building can be done. Also have a team of carpenters if need be. Have worked on big commercial projects to small domestic ones.
Get in touch
Latest review:
Hard Flooring- 5 Oct 2024
Phil did a great job on our floor. Really quickly as well. Would definitely use again.

4.6

Top rated Extension Builders

Our Extension Builders in Portsmouth, are rated 4.6 out of 5 based on 7 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 Portsmouth?

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 Portsmouth 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 Portsmouth who are available and interested can respond to your post.

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

What are the hourly rates of extension builders in Portsmouth?

Before getting started with your extension project, it’s important to have a clear budget in place. On average, extension builders in Portsmouth 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 Portsmouth extension builders near you on MyBuilder. This allows you to compare what each quote covers and how much your Portsmouth home extension project is likely to cost.

Find extension builders in Portsmouth with MyBuilder

Hiring the right extension builder in Portsmouth 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 Portsmouth extension builders. Once your job is live, we’ll share it with home extension builders in Portsmouth who can express their interest.

Step 2: Compare different extension builders in Portsmouth

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

Step 3: Hire Portsmouth extension builders with confidence

After gathering all the information and quotes from your chosen home extension builders in Portsmouth, 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.

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

What to ask a Portsmouth extension builder before hiring?

Before hiring an extension builder in Portsmouth or extension building company in Portsmouth, 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 Portsmouth?

An extension builder in Portsmouth 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 Portsmouth 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 Portsmouth?

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 Portsmouth 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 Portsmouth 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 Portsmouth

Can an extension builder in Portsmouth help with planning permission?

Yes, many extension builders in Portsmouth 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 Portsmouth handle everything from design to construction?

Many Portsmouth 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 Portsmouth help with materials and finishes?

Yes, most extension builders in Portsmouth 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.