Extension Builders in Knebworth

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 3.9 (15 reviews)

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Some of our top rated extension builders in Knebworth

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Skyline Glass
No reviews yet
Extension Builder in Knebworth
At Skyline Glass Ltd, we don't just deliver products — we deliver lasting value for your property. We specialise in high-quality glass solutions and expert construction services for both residential and commercial clients across the UK. Our full-service offering includes stunning custom glass designs, precise measurements, premium materials, and flawless installation of windows, doors, partitions, balustrades, balconies, and complete glazing systems — all crafted to elevate the look, functionality, and security of your space. But that's not all. We also provide professional driveway concrete work, creating strong, attractive, and long-lasting driveways that boost your property's kerb appeal. Plus, our home extension services are designed to help you maximise your living space, add value to your home, and create the perfect environment for your family or business. Whether you're replacing outdated fixtures, upgrading your driveway, expanding your living space, or taking on a new build or renovation, we deliver tailored solutions that combine quality, reliability, and superior craftsmanship — all with a keen eye for detail and full compliance with safety standards and building regulations. Transform your property with Skyline G
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Kiseld
No reviews yet
Extension Builder in Knebworth
Hi, i am a solo trader with 5 years experience in construction, I have a very good knowledge on everything that includes extensions, roofing, full flat refurbishment and good knowledge on other fields too, i looking forward to work for you.
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New Era Building Ltd
Rating: 5 out of 5
Extension Builder in Knebworth
We are a small but competent building company who undertake house building, extensions, brickwork and carpentry. We enjoy building one off houses from start to completion. We have an excellent resume of completed projects. We carry Contractors All Risk Insurance.
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Latest review:
Extensions- 14 Mar 2021
It was a pleasure having Simon and his team building my extension. The work started as per the agreed date and completed ahead of schedule. I would certainly use this company again in the future and would highly recommend them.
Thomas Wicks Building Services Ltd
Rating: 5 out of 5
Extension Builder in Knebworth
We are a growing domestic building company, with 20 years of experience carrying out all aspects of residential building projects. Extensions, Kitchens, Bathrooms and all of the related services such as Plumbing, Tiling, Electrics. We pride ourselves on giving the customer exactly what they want, making the experience of improving their property an enjoyable one.
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Latest review:
Bathroom Fitting- 2 Jan 2018
Tom was brilliant from start to finish. Clean and very personable, we have used him again since and will do in the future.
TJ Elite Building Services LTD
Rating: 5 out of 5
Extension Builder in Knebworth
We have a team of qualified builders, electricians, plumbers, roofers to mention a few covering all aspects the building services we offer. Accumulating over 10 years of experience, covering all requirements of our customers, we aim to deliver a high quality service for your requirements We can provide all aspects of job to be covered from start to finish, from drawing plans, approval to the high quality finish of the job.
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Latest review:
Diligent, professional and finished job to a high standard. Only needed flooring done in all rooms but after seeing the quality of work, had further work carried out in gardens front and back. Have had no issues since and hes the one family goes to for any jobs that need doing, as know work gets done and we can trust that it will be of high standard.
CanDo Constractions
No reviews yet
Extension Builder in Knebworth
medium building company whit rich experience last 16 years in London and surrounding areas. Mobile and flexible. Have a good specialist whit specific skills and experience. Work hard , fast, clear and never leave a job incomplete.
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Darktolight
Rating: 4.5 out of 5
Extension Builder in Knebworth
WELCOME to DARK 2 LIGHT CONSTRUCTION LTD. We are team of builders and electricians and all the trades . Our website is available to get more information ! Our team is made up of qualified, trusted and experienced workers . No job is too small or too big, we offer a big range of services . Call now to get a free quote !
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Latest review:
Extensions- 14 Jun 2023
⭐️⭐️⭐️⭐️Excellent Builders.👍👍⭐️⭐️⭐️ I used different types of builders for the past 10yrs for various type of job. But I would tell DARKTOLIGHT are THE BEST of all. They are skilful, honest, punctual, friendly, economical, and very professional. They always consider your financial situation and help your building/repair needs accordingly. They complete the job with the fullest satisfaction on time. I have already booked for more of my other jobs. Highly recommend.10/10.
Jass
Rating: 5 out of 5
Extension Builder in Knebworth
We do all kind of staircase with fill finishing, Roofs Structure, Roof Tiles , installing doors , Flooring and other construction work.
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Latest review:
Carpentry- 1 Jul 2026
Jass was quick to respond and gave a good price for fabricating a staircase on site. Jass made sure I was happy before leaving and readjusted one of the steps which was creaking.
Arsen.Peposh
No reviews yet
Extension Builder in Knebworth
I’m working for 10 yers in construction handyman and extension job gardening paving and roofing work
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Haymore Ltd
No reviews yet
Extension Builder in Knebworth
Built on over a decade of experience across just about every sector of construction, we have the know-how to get your project done. If you're after a loft conversion, rear extension, annex, or even a complete house overhaul, we can do it! Truthfully, almost any builder can do all that, so what makes us stand out from the crowd? We set up Haymore to be different from day 1. Our motto is “Construction Simplified” and we really believe that is what we offer.
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FERARU GROUP BUILDERS LTD
Rating: 4.7 out of 5
Extension Builder in Knebworth
I've worked in the UK for 8years now and I do my job to a high standard.
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Latest review:
Extensions- 15 Jun 2024
My advice is avoid. Poor communication Poor workmanship Poor quality finish Create 'issues' during build to make you pay more than quoted Left project incomplete We pursued through the Court and won the case, but of course he is unable to pay, so we are pursing further through the Court. He will respond to the review with some excuse, but there is absoultley no excuse for poor workmanship and quality. Happy to share pictures and videos on request.
Triune Developers Ltd
No reviews yet
Extension Builder in Knebworth
Triune Developers Ltd is a professional property development and building services company known for delivering high-quality workmanship and reliable project management from start to finish. With over 15 years of experience, we specialise in transforming properties through skilled construction, refurbishment, and decorative services. Our dedicated painting and decorating division is at the core of what we do. We provide premium interior and exterior finishes with exceptional attention to detail—whether it’s a full property renovation, a commercial space upgrade, or a single-room refresh. Every project is completed with preparation, precision, and a flawless finish that lasts. Alongside our specialist painting services, we offer a full range of building and development solutions, including: Property renovations & refurbishments. Home extensions & structural improvements. Kitchen and bathroom installations. Carpentry and joinery services. General building maintenance and repairs. We pride ourselves on being efficient, professional, and easy to work with. Our team works cleanly, communicates clearly, and respects timelines and budgets. The result is a smooth, stress-free experience and a finish that elevates the space.
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indrit gordoni
Rating: 4 out of 5
Extension Builder in Knebworth
I am a builder with 20+ years of experience, which has allowed me to specialise in pretty much every field of the sector; from tiling to fitting kitchens and bathrooms to painting etc... I am very meticulous in every job I do and always try my very best to please costumers. What I believe makes me stand out from other tradespeople is that I acquired most of my experience in Italy which is where I lived before moving here 4 years ago. This has helped me achieve different techniques and skills.
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Latest review:
Bathroom Fitting- 7 Oct 2022
Initially did a good job but then rushed the silcon round the bath/ shower that then leaked. Kept telling us he would fix it but after more than a month I gave up and fixed it myself. Shame really, another tradesman that is fine until things go wrong!
Arnold design and build limited
No reviews yet
Extension Builder in Knebworth
Over 20 years experience within Driveways and Landscaping , Building and construction
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GP Construction Services Ltd
Rating: 5 out of 5
Extension Builder in Knebworth
New build, extensions, loft conversion, glazing, roofing, electrical and plumbing
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Latest review:
We recently bought flat to let and decided to do completely refurbish. We invited few quotations including Gurwinder. We shortlisted top 3 quotation and invited him for discussion. During the meeting he was very professional and full of ideas. So we decided to honour him. Work started as agree on time, during the Job we liked his ownership of the work and advising us on the very step of the decision. Although it would have been better if his communications were more punctual but it neither affect us nor delayed any work. Even after completion he has been very helpful if any issue arises ( nothing major).
C&L Construction services LTD
No reviews yet
Extension Builder in Knebworth
At C&L Construction Services Ltd, we specialise in providing a complete construction service delivering refurbishment, development and maintenance services. We work on any projects from homeowners looking to extend complete /refurbishment of bathrooms and kitchens, modernisation for smart homes and automation systems and a full project management and design service. We can advise on material selection help navigate the minefield of planning building and health and safety regulations
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3.9

Top rated Extension Builders

Our Extension Builders in Knebworth, are rated 3.9 out of 5 based on 15 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 Knebworth?

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

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

What are the hourly rates of extension builders in Knebworth?

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

Find extension builders in Knebworth with MyBuilder

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

Step 2: Compare different extension builders in Knebworth

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

Step 3: Hire Knebworth extension builders with confidence

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

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

What to ask a Knebworth extension builder before hiring?

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

An extension builder in Knebworth 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 Knebworth 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 Knebworth?

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 Knebworth 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 Knebworth 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 Knebworth

Can an extension builder in Knebworth help with planning permission?

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

Many Knebworth 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 Knebworth help with materials and finishes?

Yes, most extension builders in Knebworth 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.