Hertfordshire, Bedfordshire & London
Home extensions,
built better.
Single and double storey extensions, kitchen extensions and loft conversions, designed and built by one trusted team across Hertfordshire, Bedfordshire and London.
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Featured project
Old Timber Cottage
Stevenage, HertfordshireExtension & Renovation
A tired timber cottage in Stevenage rescued from top to bottom. Structural alterations and repairs, a rear extension with a big open plan kitchen, a brand new roof and a complete interior renovation, keeping all the character and losing the tired bits.
- Structural alterations and repairs
- Rear extension with an open plan kitchen
- A brand new roof
- Complete interior renovation
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Recent work
Projects we are proud of
A look at recent extensions, conversions and renovations across Hertfordshire, Bedfordshire and London.
What we build
Built around how you
want to live
Extensions are our specialism, backed by the full range of building services to take your project from first idea to finished home.
Our specialism
More space, without the move.
Extending is almost always the smarter choice. You keep the home, the street and the schools you love, and gain the space your family actually needs. After 35 years of extension work, we know how to do it without the surprises.
- Single storey rear and side return extensions
- Double storey extensions for bedrooms and en-suites
- Open-plan kitchen extensions with glazing and lanterns
- Wrap-around extensions that reshape the ground floor
Why DNR Build
The difference is in who you work with
No call centres, no disappearing subcontractors. Just one experienced team that treats your home like its own.
Extension specialists
Extensions are what we do best. Decades of single and double storey builds mean fewer surprises and a better finish.
One accountable team
You talk directly to the people doing the work. No layers, no passing the buck, no disappearing subcontractors.
Clear, fixed quotes
Itemised pricing agreed before we begin. You always know what you are paying for and why.
35 years of craft
Three and a half decades on the tools and on site, building a reputation on referrals rather than adverts.
Tidy, respectful sites
It is still your home while we work. We protect it, keep it clean and treat it the way we would treat our own.
Built to last
Structurally sound, properly certified and finished to a standard that adds real, lasting value to your home.
How it works
A clear path from idea to handover
Five simple steps, one team, and no surprises along the way.
Consultation
We visit your home, listen to how you want to live, and talk honestly about what is possible and what it should cost.
Design & Planning
We work with trusted architects and engineers to develop drawings, handle planning and building control, and refine the detail.
Fixed Quote
You receive a clear, itemised quote with no hidden extras, so you know exactly what you are paying for before we start.
The Build
One dedicated team manages your project from first dig to final coat, keeping the site tidy and keeping you informed.
Handover
We walk you through the finished work, hand over certificates and guarantees, and stay on hand long after the keys are back.
Client stories
Trusted in homes across three counties
Much of our work comes from referrals and repeat clients. That trust is something we never take for granted.
“Huge thanks to DNR Build for doing such a brilliant job on our recent home project. The team was professional, turned up on time, and showed incredible attention to detail from day one. They handled everything seamlessly, kept us informed at every step, and left the site spotless when finished. High-quality build quality and proper tradesmen. Highly recommended!”
Jordan Hale
Home project · Google review
“More often than not, when your insurance company sends someone to put your house right you don't get a lot of say about who that is. Dave and Rhys are absolutely the sort of people you want to have working on your house. They are respectful, professional and well humoured. More importantly, they don't take shortcuts and take the time to ask questions and understand things. When my insurer had underspecified, they didn't 'bodge' it, they went back and fought for a budget to do the job properly. Dave is all about the details and finishing touches. You can hire them knowing that whatever job, they'll do it properly and keep you informed along the way.”
James Hall
Insurance repair · Google review
“Very happy with my extension and the high standard of work. Dave kept me informed all the way along. Would recommend.”
Liz
Home extension · Google review
“Dave and Reece did a fantastic job converting our downstairs WC into a shower room. Not a huge amount of space to work with but the boys were absolutely amazing. They also replaced our soffits, fascias and gutters and sealed off a leaky chimney. Prices quoted were very competitive and Dave's coordination was on point every step of the way. Professional, courteous and kept us in the loop all the way.”
Garvin Ramsook
WC to shower room · Google review
“Five stars. I have now used David and his team for two large projects and I cannot recommend them highly enough. David is reliable, extremely hardworking, knowledgeable, skilled and above all a really lovely man to do business with.”
Tracy Kosmalski
Repeat client · Google review
“Amazing contractors. Would highly recommend Dave and Rhys. They converted a half bath to a full bathroom plus did work on our guttering and roof. All jobs were carried out well and according to the planned schedule. They were on time and professional throughout.”
Emma Jimdar
Bathroom, roof and guttering · Google review
“Dave and Reece are great. Polite, considerate and great workmanship. The job was an insurance rebuild of a garage wall after neighbours had an accident. The wall was rebuilt in a day and looks fantastic, and they coped with three dogs sniffing around whilst working too. Thanks guys.”
Kim Heatley
Insurance rebuild · Google review
“Dave and his team have transformed our home. The work was completed efficiently and to a very high standard. Highly recommend.”
Gemma Dashwood
Home renovation · Google review
Good to know
Questions, answered
The things homeowners ask us most about extensions, planning and getting started.
Many single storey extensions fall under permitted development and do not need full planning permission, but it depends on the size, your property and your location. We assess this at the consultation stage and handle planning and building control on your behalf where it is needed.
Every extension is different, so we provide a clear, itemised fixed quote after understanding your project rather than a vague estimate. As a guide, single storey extensions typically start in the tens of thousands and rise with size, glazing and finish. We will always be honest about budget early on.
A single storey rear extension typically takes around 10 to 16 weeks on site once started, while double storey extensions and loft conversions can take longer. We give you a realistic programme before we begin and keep you updated throughout.
We work across Hertfordshire, Bedfordshire and London, including St Albans, Stevenage, Hitchin, Welwyn Garden City, Bedford, Luton, Barnet and the surrounding areas. If you are nearby, get in touch and we will let you know.
Yes. One accountable DNR team manages your build from the first consultation through design, planning, groundworks and finishing. You deal directly with the people doing the work, not a chain of subcontractors.
Matching brickwork, rooflines and details is something we take seriously. We source materials carefully so a new extension reads as part of the original home rather than an obvious add-on.
Let us build it
Ready to make more of your home?
Tell us about your project and we will arrange a no-obligation visit, honest advice and a clear fixed quote.