Single-Storey Extensions
Rear extensions, side returns, kitchen diners and open-plan living spaces. RSJ installation, foundations, and full project delivery.
Get EstimateFrom single-storey wraps to double-height additions, we deliver structural integrity and seamless integration with your existing home.
Free planning consultation and a no-obligation quote
Extension Types
From planning permission to final handover, we manage the full build with structural integrity at every stage.
Rear extensions, side returns, kitchen diners and open-plan living spaces. RSJ installation, foundations, and full project delivery.
Get EstimateMaximise space by extending to the side and rear simultaneously. Structural steelwork, matched brickwork, and seamless integration.
Get EstimateAdd bedrooms, bathrooms, or office space above your ground floor extension. Full structural engineering and Building Regulations compliance.
Get EstimateLoad-bearing wall removal, RSJ and beam installation, underpinning, and foundation work for open-plan layouts.
Get EstimateOur Process
Site visit, requirements discussion, and initial feasibility assessment. We'll explain your options under permitted development or planning permission.
Transparent, itemised pricing within 24 hours. No hidden costs. We break down foundations, structural work, materials, and finishing.
Clear schedule with milestone dates. Foundations, structural steel, brickwork, roofing, internals—we track every phase.
Final inspection, Building Regulations sign-off, and full documentation. We don't leave until you're satisfied.
Our Work
Testimonials
"Denis and Dan recently carried out the works to the corner of our house, I can say we are absolutely thrilled with the job from start to finish, it was nothing but professional. Denis updated us each step of the way with pics and messages and nothing was too much trouble. I wouldn't hesitate to recommend DNDH to anyone wanting any works. Thanks to these guys we have had our vision come to life!"
"Dennis and his team done an excellent job on our double story extension in Letchworth. We couldn't be any happy with the work they done. The work was very neat and tidy and above standard. Dennis done lots of extra jobs also with no issues. Definitely recommend these lads."
"Dan and Denis—professional tradespeople, very competent builders. When they get to site you don't need to worry about anything, they take care of it all. Very polite with good characters. Treat your property with respect and ensure best standards at all times. All work carried out with the utmost skill and workmanship. The speed the building went up was just amazing. Also very trustworthy both Dan and Denis. Great work!"
FAQ
Many single-storey rear extensions fall under Permitted Development rights, meaning no full planning application is required. However, double-storey extensions, side extensions, and properties in conservation areas typically need planning permission. We'll advise you on the correct route during your free consultation and can handle the application if needed.
Extension costs vary depending on size, specification, and structural complexity. Single-storey extensions typically start lower than double-storey builds, while wrap-around extensions and structural alterations add to the cost. We provide a free, itemised quote within 24 hours so you know exactly what you're paying for—no hidden costs.
A single-storey extension usually takes 8–12 weeks from breaking ground to handover, while double-storey extensions can take 12–16 weeks. Factors include weather, ground conditions, and Building Regulations inspections. We provide a clear build programme with milestone dates at the start of every project.
Yes. We manage the full Building Regulations process, including structural calculations, site inspections, and final sign-off. Our work is fully compliant with current UK Building Regulations, and you receive all completion documentation on handover.
Absolutely. We specialise in structural alterations including load-bearing wall removal, RSJ and steel beam installation, and underpinning. All structural work is engineered to specification and signed off by Building Control.
Get a free, no-obligation quote within 24 hours. We'll visit your property and discuss your extension options.