Extension Builders in Horsham

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 3.9 (8 reviews)

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Some of our top rated extension builders in Horsham

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M Sullivan Builders
Rating: 5 out of 5
Extension Builder in Horsham
My name is Mark Sullivan. I have over 30 years experience in the building industry. I have a City & Guilds in carpentry and joinery. I also have experience in extensions, garage conversions, house renovations, plastering, fencing and plumbing guttering. I pride myself on providing an excellent professional service and value for money without compromising on quality. I have a portfolio of photographs of previous projects completed on request.
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Latest review:
Carpentry- 12 Sep 2026
Polite and easy to work with. Good standard of work, delivered to time and agreed cost. Left the work areas clean and tidy. Would use again no issue.
Advanced Groundworks
Rating: 5 out of 5
Extension Builder in Horsham
With over 30 years experience in ground work and 10 years in business we are able for all types of jobs. The jobs we do include: ■Demolition ■New builds and footings ■Driveway installation ■Concrete slabs for sheds Insurance can be provided upon request. All work is guaranteed.
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Latest review:
Groundwork & Foundations- 22 May 2026
John did a fantastic job with the groundworks for our new 150sqm block driveway. He priced keenly, started quickly and was on-site consistently every day for the week. Really skilled with the digger, good at dealing with the neighbours and always fun to talk to. Some aspects of the job changed based on what the dig uncovered, but he was pragmatic and ultimately left me feeling that he just really wanted to do a good job as if it was his own. Highly recommended - 10/10.
Singh Builders West Sussex Ltd
Rating: 5 out of 5
Extension Builder in Horsham
We are a leading home builder and renovation company dedicated to crafting exceptional living spaces that inspire and delight. With a proven track record of excellence, we provide a plethora of home-building services. Whether it’s our new build services, loft conversions, home extensions, or renovations, we strive for perfection. Our designers will realise your ideas on time, within budget, and with stunning results. No matter how complicated the job is, we can handle it.
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Latest review:
Loft Conversion- 23 Jun 2024
Singh builders was contracted to do the shell of my loft conversion. It was a daunting task at first choosing the right contractors but Singhs builders were reassuring right from the start as well as knowledgeable and reasonably priced. They have gone above and beyond to meet my needs and ensure I was pleased with everything every step of the way. The quality of their work is to an extremely high standard. To say I am pleased is an understatement! I would definitely recommend again!
R3 carpentry southern limited
Rating: 5 out of 5
Extension Builder in Horsham
We are a Carpentry company based in Portsmouth covering all aspects of residential new build and domestic Carpentry. Our team are all fully qualified carpenters, and CSCS Registered and are dedicated to providing a proffesional service and our project manager is always on hand to oversee and check the quality of work produced and manage each project from start to finish. When using other trades for larger jobs such as loft conversions or extensions we only use fully qualified trades who are know to us and have worked for us on previous jobs. We are fully accredited with SMAS and the health and safety of our team and customers is monitored closely at all times with full CDM provided at the start of each job when applicable. The quality of our work is exemplary which is why our current client base return time and time again, alongside the domestic side of our business we provide subcontractor carpenters to some of UKs largest housebuilders in the residential new build sector covering all aspects of Carpentry from start to finish and to the high standards of NHBC inspectors. We would love the opportunity to quote for your project and look forward to meeting you. Search R3 carpentry southern on Facebook or inatagram to check out our latest work. KR Danny Robinson
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Latest review:
Carpentry- 25 Nov 2024
Danny and the team did a great job, communicated well throughout the process and really happy with the outcome. 3 separate jobs but everything completed as asked (even with the boss of the house changing things) Give Danny a call!
TLC brickwork
Rating: 5 out of 5
Extension Builder in Horsham
A highly qualified time served bricklayer who can help you in many projects from small garden walls to a new build
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Latest review:
Bricklaying- 9 Sep 2025
Tony rebuilt a raised patio for us that was starting to collapse. When he came to assess the job is was obvious he knew exactly what needed to be done. He was able to start quickly and finished quickly leaving everything very clean and tidy. I would 100% recommend if you want a very experienced builder to do a professional job.
JMS (Sussex) Homes ltd
Rating: 5 out of 5
Extension Builder in Horsham
We have over 20 years experience in property development including new builds, extensions, landscaping and ground works. Fully trained brick layers, carpenters, plumbers, electricians, roofers, plasterers and decorators. We can travel up to an hour from RH12. Our work is the highest possible standard. We are ICW registered and completely insured.
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Latest review:
Extensions- 17 Mar 2025
Joel was very efficient and worked to a high standard. We would use him again.
DMJ BUILDING AND ROOFING
Rating: 5 out of 5
Extension Builder in Horsham
We're a very experienced company in all aspects of building and roofing ranging from the most simple jobs to new build full renovation barn conversion were all so specialist in all aspects of roofing and specialist in grp fiberglass roofing. We also provide a bathroom and kitchen service
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Latest review:
Extensions- 10 Apr 2026
The most lovely builder to have around, super knowledgeable and reliable and an excellent level of work from beginning to end. The job took longer than expected but the outcome was definitely worth the extra time to achieve an amazing result. Would absolutely recommend and will be using again for future projects.
NJP
Rating: 5 out of 5
Extension Builder in Horsham
We are a plastering and small building works company based in Horsham, West Sussex. I have 15 years plastering experience and have been working in the building trade for 20 years. I am happy to under take all plastering internal/external, studwork/ceilings and internal alterations. I have over 150 positive reviews on another check trade site of which I can share if shortlisted for your next project. Kind regards Danny
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Latest review:
Plastering- 27 Dec 2021
Danny responded to our job post within a few working hours and came over to give a quote the next day. The job consisted of skimming over our artex ceilings and we are extremely happy with the outcome. So much so that we have asked Danny to carry out more work on our property since. Thank you very much.
Steven Gibbs
Rating: 5 out of 5
Extension Builder in Horsham
Solid experience in Brickwork, this includes; facework, blockwork and grounds work. Are speciality is facework; porches, retaining walls, interior fireplaces and most general brickwork. Brickwork to the highest, neatest standard. My aim is to take the time to insure I give the highest quality finish. References available. Relevant qualifications.
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Latest review:
Bricklaying- 17 Jul 2019
Steve built a great front wall for us and was really helpful with ideas and sourcing materials. He was very reliable, hardworking and tidy and I would definitely recommend him.
Hedgehog Home Improvements
Rating: 5 out of 5
Extension Builder in Horsham
We are a family run business based in Barns Green, west sussex. Our tradesmen have over 20 years experience in the building trade and are fully insured. We undertake all types of extensions,conversions and property maintenance, along with bespoke timber framed buildings, oak framed buildings and garden rooms.
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Latest review:
Roofing (Pitched)- 8 May 2019
arrived promptly and completed the job satisfactorily
AF Bespoke
Rating: 5 out of 5
Extension Builder in Horsham
AF Bespoke is a business is made up by two friends who have teamed up and brought their skills in together. The type of work that we do is bespoke to improve your outdoor space. The work we normally undertake goes from deckings to outdoor garden structures, bespoke outdoor buildings, garden sheds, fencing and patios and any other outdoor maintenance.
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Latest review:
Fencing- 20 Mar 2022
Freddie and Austin are reliable, friendly and helpful and did a great job with the replacement and fitting of a fence panel. Wouldn't hesitate to recommend or hire AF Bespoke again.
S.Mayes builders
Rating: 5 out of 5
Extension Builder in Horsham
I'm a professional builder with 30 years experience. I pride myself on my reputation-offering a reliable service at a competitive rate.I always turn up on time.I enjoy what I do & this shows in the standard of my work & the relationships I build with clients.
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Latest review:
Bricklaying- 12 Apr 2010
Steve was very professional from beginning to end. Turned up on time and completed the job to an excellent standard. Would definetly use again.
Benjamin Godden
Rating: 5 out of 5
Extension Builder in Horsham
I provide a Bricklaying service in and around sussex. We Pride ourselves on excellent workmanship, reliability and the ability to deliver a finished project to every customers satisfaction. A small dedicated team setting the standard in bricklaying and hard landscaping work.
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Latest review:
Bricklaying- 16 Aug 2015
This chap & team do a first class job, work was methodically executed in an orderly fashion including attention to detail. Review project photos demonstrate the quality of his work. I would highly recommend.
CGH
Rating: 5 out of 5
Extension Builder in Horsham
A highly skilled & experienced general builder with three decades of hands-on expertise in the construction industry. Proficient in all aspects of residential & commercial buildings, including Structural works, renovations, ensuring compliance with building codes & delivering high-quality craftsmanship. Known for a strong work ethic, problem-solving skills, & attention to detail, with a commitment to completing projects on time & within budget. Well-versed in health & safety regulation, project planning, & client relations. Whether working independently or leading a team, consistently delivers durable, aesthetically pleasing, & functional structures. * Upgrade bathrooms & Kitchens * renovation projects * Room extensions * Outbuilding conversions * Porches * Garage conversions * foundations “ Damp Proofing * concreting * drainage projects * turfing * garden clearance * artificial grass * resin installers
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Latest review:
Extensions- 17 Feb 2022
Chris did a fantastic job laying a new patio which needed to be raised to meet the door level. Chris is really friendly, reliable and worked incredibly hard. He communicated everything really well and the finished job is superb. I can’t recommend Chris highly enough. I’ll certainly be using him again for our next project.
Southwater Building Company
Rating: 5 out of 5
Extension Builder in Horsham
We are a building company specialising in extensions, brickwork, carpentry, landscaping, and driveways. We are a small company and most of the work is undertaken by us and the small group of other trades that we have worked with for a long time (electricians and plumbers). We offer a personal service and always stay on site until the job is completed.
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Latest review:
Tim carried out repairs to our flat roof and extension roof. The work was done to a high standard and Tim and team were polite, tidy and reliable. I wouldn’t hesitate to recommend Southwater Building Company.
Signature Lofts
Rating: 5 out of 5
Extension Builder in Horsham
Signature lofts is a small family Loft conversion company with 25 years experience . We specialise in Loft conversions and extensions in Sussex Kent & Surrey. Have a browse through our Website & Facebook.
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Latest review:
Loft Conversion- 1 Apr 2026
We recently had a loft conversion and extension done by signature lofts All the work they done looks great. They were very friendly, And at times worked very late into the evening and also some weekends I would definitely recommend Dave and his team for loft conversions and extensions. Best, Scott

3.9

Top rated Extension Builders

Our Extension Builders in Horsham, are rated 3.9 out of 5 based on 8 reviews from customers like you.

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

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

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

What are the hourly rates of extension builders in Horsham?

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

Find extension builders in Horsham with MyBuilder

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

Step 2: Compare different extension builders in Horsham

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

Step 3: Hire Horsham extension builders with confidence

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

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

What to ask a Horsham extension builder before hiring?

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

An extension builder in Horsham 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 Horsham 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 Horsham?

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 Horsham 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 Horsham 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 Horsham

Can an extension builder in Horsham help with planning permission?

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

Many Horsham 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 Horsham help with materials and finishes?

Yes, most extension builders in Horsham 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.