Expert Extension Builders You Can Trust
✔ Family-run business
✔ All extension types covered
✔ 39 Years Experience
✔ Planning permission support
✔ Experienced Home Extension Contractors
From single-storey rear extensions to full double-storey builds- we handle everything, including planning permission, design, and the complete build.
Years Combined Experience
39
103+
Extensions Completed
145+
Total Projects Delivered
What Our Clients Say
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Liam O'Donnell
We engaged Utopian Build for a full-scale renovation of our period property and their attention to detail was second to none. Every bespoke element, from intricate joinery to modern finishes, was executed flawlessly. Their ability to balance heritage restoration with contemporary luxury made this project a huge success. Highly recommended!
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Tommy Day
Having worked with various contractors over the years, I can confidently say that Utopian Build is in a league of its own. The quality of their work, especially on luxury finishes was fantastic. Bradley and his team showed dedication, ensuring everything was completed to the highest standard.
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James Craig
From the first site visit we had to the final handover, Utopian Build exceeded our expectations. They delivered our vision with precision and craftsmanship that we were truly impressed by. The entire process was seamless. Bradley and his team delivered beyond what we imagined. Great job Bradley & Co, thanks!
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Sebastian Acebuque
Our project was far from straightforward, with unexpected structural issues along the way, but our team tackled every challenge head-on, finding smart solutions without compromising on the quality we expected. Despite the setbacks, they delivered a stunning finish, and we couldn’t be happier. True professionals and would definitely recommend.
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Steven Montgomery
Bradley and his team were excellent throughout the process. They were extremely easy to work with during the project (first storey extension for bedroom and bathroom) and delivered a fantastic result. They were polite, transparent and trustworthy. I would recommend them highly and will also use them again for any future projects.
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Douglas Evans
I have worked with Utopian Build on a number of projects, and they have been exemplary every time.
High quality work, competitive pricing and working within programmed timescales make running my projects far easier, knowing that I'm working with a reliable contractor.
Brad is very professional throughout and his teams operate in a professional manner whilst ensuring clients needs are met.
I always recommend Utopian Build to my clients and highly recommend them.
Every Type of House Extension, Handled End-to-End
Rear Extensions
Single and double storey rear extensions, the most popular way to open up your kitchen, dining room, or living space. As experienced extension builders, we handle permitted development and full planning.
Kitchen Extensions
We specialise in kitchen extensions that create the heart of the home, designed to bring families together while enhancing space, light, and everyday living.
Side Extensions
Perfect for maximising the gap at the side of your property. Creates valuable additional floor space and can dramatically transform the feel of your home.
Double Storey Extensions
Add bedrooms above and living space below in one build. Cost-effective per square metre and a great way to add significant value to your property.
Wrap-Around Extensions
Combines rear and side to create a large, open-plan living area. Ideal for families wanting to significantly expand their ground floor footprint.
Bungalow Extensions
Single storey bungalow extensions require specialist knowledge of foundations and structural details. We have extensive experience delivering bungalow builds.
Our Six Stage Process
Simple. Transparent. Stress-Free.
From your first call to final handover, we manage every stage so you don't have to worry about a thing.
Free Consultation
We visit your property, understand your goals, and assess what's possible within planning rules.
Design & Quote
We produce detailed drawings and a transparent, itemised quote — no hidden costs.
Planning Permission
We handle all planning applications and permitted development submissions on your behalf.
The Build
Our experienced team delivers the full build: structure, interior finishes, and all trades managed by us.
Handover
We hand you the keys to your completed extension, with full sign-off and all documentation.
Why Choose Utopian Build
10 Year Structural Warranty
Built to last, fully compliant and professionally guaranteed.
A Family Business Built on Craft & Reputation. As experienced extension builders, we bring 39 years of combined expertise to every project, with hands-on involvement from start to finish.
Full Project Management
Dedicated oversight from concept through to completion.
Transparent Cost Planning
Structured budgets and realistic programme control from day one.
Extension Specialists
Experienced in delivering quality home extensions across Hertfordshire.
Worried About Planning Permission?
Most homeowners aren't sure where to start with planning. As experienced home extension contractors, we handle everything for you from understanding what's permitted by right to submitting full planning applications.
Our Projects
Luxury House Renovation
Project Type - Luxury Extension
Location - Heathrow
Construction Period - 7 months
Modern Family New Build
Project Type - New Build
Location - Goffs Oak
Construction Period - 12 months
Bespoke Country Home
Project Type - New Build
Location - Harpenden
Construction Period - 20 months
Modern Extension
Project Type - Luxury Extension & Interior Remodel
Location - St Albans
Construction Period - 7 months
Contemporary Barn Conversion
Project Type - New Build
Location - Ware
Construction Period - 11 months
Luxury Bathroom Renovation
Project Type - Full multi bathroom remodel
Location - Broxbourne
Construction Period - 2 months
Expert Extension Builders Serving Hertfordshire & Beyond
We're a family-run extension and construction firm based in Hertfordshire, with 39 years of combined experience delivering house extensions and home builds across the region. Our teams work across Hertfordshire, North London, Cambridgeshire, and the Chilterns.
Below are the towns and areas we regularly serve. If you don't see your location listed, give us a call and we're happy to confirm coverage for your project.
Hertfordshire
St Albans (AL1, AL2, AL3, AL4) · Harpenden (AL5) · Welwyn (AL6) · Hatfield (AL9) · Rickmansworth (WD3) · Borehamwood (WD6) · Radlett (WD7) · Potters Bar (EN6)
East Hertfordshire
Hertford (SG13, SG14) · Broxbourne (EN10) · Cheshunt (EN7)
North West London & Middlesex
Northwood (HA6)
Chilterns & Dacorum
Berkhamsted (HP4) · Tring (HP23)
North Hertfordshire
Hitchin (SG4, SG5) · Royston (SG8) · Buntingford (SG9)
East Hertfordshire & Essex Border
Bishop's Stortford (CM22, CM23)
Cambridge & Surrounds
Cambridge (CB1, CB2, CB3, CB4, CB5) · Great Shelford (CB22) · Sawston (CB22) · Comberton (CB23) · Histon (CB24) · Newmarket (CB8 area, CB25)
Not sure if we cover your area? Call 01992 289001 and we'll confirm within minutes.
Ready to Get Started?
Unit 2, Hoddesdon industrial estate, Pindar Road, Hoddesdon, EN110DD
Office Hours –
Mon-Fri (8am-6pm) & Sat (9am-4pm)
Connect With Us -
Share your plans and get clear next steps for your build
✔ Free consultation ✔ Clear pricing ✔ No obligation
We’ll get back to you within 24 hours.