Extension Builders in Hertfordshire

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 3.7 (13 reviews)

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

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 Hertfordshire

1785 Results

Sort by:

Eisa
No reviews yet
Extension Builder in Hertfordshire
At PowerPro Contractors your property is our priority.
Get in touch
Icknield Builders Ltd
Rating: 5 out of 5
Extension Builder in Hertfordshire
Icknield Builders have been established since 1962 A family owned builder and public works design, build and manage Main contractor whom serve the local community offering a high standard of building services to include: Groundworks ,concrete works ,brickwork ,fencing ,bespoke carpentry and joinery, electrical ,plumbing ,mechanical ,painting and decorating ,hardscaping and landscaping, windows and door (timber, crittle aluminium and UPvc ,All aspects of roofing ,facias and soffits -
Get in touch
Latest review:
Foundations and outdoor 8x5mtr garden room complete Icknield builders ,fantastic company to work with, everything I asked for was done and more !! lads were lovely and perlite and always on time cannot recommend them enough would not hesitate to use them again .
Jr general building
Rating: 5 out of 5
Extension Builder in Hertfordshire
Professional Builders JR General Building Ltd is a fully-insured, limited company with a heritage spanning three generations. We excel in delivering comprehensive building services, from foundational work to chimney construction. Our specialised departments are staffed by fully-qualified professionals, ensuring all your requirements are met to the highest standards. As an SMAS-accredited organisation, we take safety seriously. Every member of our team holds a CSCS registration, guaranteeing not just an exceptional finished project, but also a commitment to conducting work in a safe and secure manner. 20+ years experience 500+ projects 100% customer satisfaction
Get in touch
Latest review:
Driveways (Paved & Loose)- 23 Oct 2023
Very pleased with the repair work on my block paved driveway. Jamie and Lee were very professional and helpful. Job was completed quickly and at a reasonable price. I would use them again!
jsmatajconstruction.ltd
No reviews yet
Extension Builder in Hertfordshire
I am writing to introduce our company JSMatajConstruction.LTD as we wish to establish a relationship with you and your organisation. We have been a construction company since 2017, we specialise in extensions and renovations (kitchen & bathroom upgrade). We have never compromised on the quality and the services provided to the customer. We believe in keeping the customers happy and providing them with products at a very competent price.
Get in touch
Reach Perfection
No reviews yet
Extension Builder in Hertfordshire
Electrical- painting- bricklayer and most construction work apart from plumbing and generally I am a handy man with 7 years work experience in construction
Get in touch
David Mario builders
No reviews yet
Extension Builder in Hertfordshire
Building Company for all your building needs whether its building to Garden work, Tiling or carpentry. No job too big or small. Get in touch for a quote.
Get in touch
County Building
No reviews yet
Extension Builder in Hertfordshire
We are a family run business with over 40years experience. We cover the whole of Hertfordshire, Essex and north London. We do everything from new builds, extensions, renovations to garden landscaping. We pride ourselves on our quality of work and never finish a job until our customers are happy with them end product.
Get in touch
from old to new
No reviews yet
Extension Builder in Hertfordshire
Hello there. I have experience in construction industry over 15+ years . We undertake any jobs small big. Here is a list of works we usually carry. Loft Conversation, Extensions, New builds, Full refurbishments, bathroom refurbishments, Painting & Decorating. Carpentry, kitchen fitting, Roofing. If you need are help let as know
Get in touch
KC & TROY CONSTRUCTION LTD
No reviews yet
Extension Builder in Hertfordshire
Hi my name is Patryk, I have started this company in my dad’s and son’s name. I have been involved in the building trade for 14 years. I started with my dad and I want to carry on until my son is able to take over. I am rather versatile in the building trade (Extension, Roofing, Rendering, Fencing, Fibreglass, Roofing, Patios, Ground Works, Structural Works, Kitchen, Bespoke Sheds) and much more. The most important thing for me is starting and finishing a project with a happy customer.
Get in touch
Jeffrey Worts
No reviews yet
Extension Builder in Hertfordshire
I am a reliable trustworthy local builder with a vast range of experience built up over 40 years in the industry. Able to help you in designing and fulfilling your project.
Get in touch
BDM Construction Ltd
Rating: 1 out of 5
Extension Builder in Hertfordshire
I have been working in the construction industry for over 15 years. I have done new builds, refurbishments, restorations and any type of building work. I am responsible in all I do and I always finish what I start.
Get in touch
Latest review:
Carpentry- 24 Jun 2025
Floor lifted after less than 6 months. Not replies, not guarantee, not interested once money was paid. Also son damaged a door as inexperienced and nothing got resolved. Again, not answer. Contacted in multiple occasions Gave enough opportunities to remediate the problem but not response. Not very professional Or honest. Matter in court now.
Dizzain Ltd
Rating: 5 out of 5
Extension Builder in Hertfordshire
The multi trader with excellent skills and consistently good in work performance. If you need help with your house project, such as internal structural changes, rear extensions, loft conversions or any other house structural issues, please don't hesitate to contact. Happy to help and discuss suitable solutions regarding structural design, and to comply with building regulations. A fair and good fees.
Get in touch
Latest review:
We used Andrius recently and were very happy with the service. Inspected our house and spent a lot of time discussing everything in detail. He completed the drawings very quick and communication was good. Good value for money. He even helped amending something later on as needed. Thank you!
Almedon construction
Rating: 4 out of 5
Extension Builder in Hertfordshire
Almedon Construction is a privately owned family run business that exudes energy, ambition, and confidence. We leading independent versatile and experienced construction business for more then 15 years providing specialist solutions for Remediation, Groundworks, temporary works, and RC Frames, precast & insitu concrete, frames, external works, loft conversion, extension, Interior painting & decorating, Exterior painting & decorating across London.
Get in touch
Latest review:
Painting & Decorating- 14 Feb 2023
Edwart is polite, gave a competitive quote and got started straight away. He provided the materials and the workmanship is good enough. He and his team worked hard and stopped smoking in the house after I asked them not to.
Hasanozdemir
No reviews yet
Extension Builder in Hertfordshire
I have been working in the construction industry for 7 years, and I do painting, repair, parquet ,laminate flooring, partitions, loft construction, garden works, pavement, digging, demolition, fencing etc.
Get in touch
Bbs construction ltd
No reviews yet
Extension Builder in Hertfordshire
All jobs undertaken, no job too small or big, 30 years experience in the building and restoration, plus roofing, Whether its hanging a picture hook or a conversion
Get in touch
Lee winkworth
No reviews yet
Extension Builder in Hertfordshire
Experienced builder in all reconstruction works including loft conversions and extensions as well as re development plans including all plastering works including plastering ,rendering , screeding ,dry lining ,tacking ,carpentry and joinery as well as board work and installing insulation in many forms such as celotex, rockwool, interior and exterior insulation board and also soundboard installation to regulation standards ,ground works and drainage also undertaken to superior standards
Get in touch

3.7

Top rated Extension Builders

Our Extension Builders in Hertfordshire, are rated 3.7 out of 5 based on 13 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 Hertfordshire?

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

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

What are the hourly rates of extension builders in Hertfordshire?

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

Find extension builders in Hertfordshire with MyBuilder

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

Step 2: Compare different extension builders in Hertfordshire

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

Step 3: Hire Hertfordshire extension builders with confidence

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

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

What to ask a Hertfordshire extension builder before hiring?

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

An extension builder in Hertfordshire 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 Hertfordshire 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 Hertfordshire?

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 Hertfordshire 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 Hertfordshire 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 Hertfordshire

Can an extension builder in Hertfordshire help with planning permission?

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

Many Hertfordshire 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 Hertfordshire help with materials and finishes?

Yes, most extension builders in Hertfordshire 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.