House Extensions in Radlett, Hertfordshire & North London
Adding space, light and value to family homes across the region. Single-storey, double-storey and wrap-around extensions delivered end-to-end by one experienced team.
Extensions that make your home work better.
For over 30 years, VZ Builders have designed and built extensions for families across Radlett, Hertfordshire and North London. From open-plan kitchen extensions in St Albans and Bushey to rear and side-return projects in Barnet, Mill Hill and Hampstead, we create the extra space that changes how a family lives.
Every extension is delivered with a single point of contact, a fixed itemised quote, and one team from foundations to finish.
One Team, Start to Finsih
No subcontractor chaos, we manage every trade, every stage.
Clear quotes, no surprises.
Transparent pricing with itemised estimates before any work begins.
Insured and Accountable
Full public liability, structural guarantees, and a single point of contact throughout.
Quality you can see.
Every project finished to the highest standard.
From modest side returns to full rear extensions.
- Single-storey rear extensions to open up kitchens and create open-plan family living.
- Double-storey extensions to add bedrooms, bathrooms and living space in one project.
- Wrap-around extensions combining side and rear extensions for maximum ground-floor space.
- Side-return extensions on Victorian and Edwardian terraces across North London.
- Kitchen extensions with structural glazing, bifolds and lantern rooflights.
- Loft conversions and dormer extensions to add bedrooms and en-suites within the existing footprint.
A complete extension service, in-house.
Every stage handled by our own team. One point of contact, one standard, from foundations to finished space.
- Structural design and engineering coordination
- Foundations, groundworks and drainage
- Steel and structural openings
- Full external envelope: brickwork, render, cladding, roofing
- Windows, doors, bifolds and structural glazing
- Plumbing, electrics, heating and underfloor systems
- Plastering, tiling and decoration
- Bespoke fitted joinery, kitchens and bathrooms
- Full compliance with building regulations and party-wall agreements
Working across Hertfordshire and North London.
Based in Radlett and working throughout Hertfordshire and Greater London, including Elstree, Borehamwood, Bushey, Potters Bar and St Albans, and across North London to Hampstead, Highgate, Barnet, Mill Hill, Finchley and Hendon.
If your home is within reasonable reach of Radlett, we would love to hear about your project.
Why Choose VZ Builders?
Over 30 years of craftsmanship.
Personally overseen by founders Tim Vata and Almir Zani.
One team, every stage.
Our own bricklayers, carpenters, plasterers and joiners. Better quality control, tighter timelines.
Fixed, itemised quotes.
You know exactly what’s included, what it costs, and when it will be delivered.
Deep local knowledge.
Decades of working across Hertfordshire and North London means we know the planners, the considerations, and the people to trust.
Frequently Asked Questions
How long does a house extension take in Hertfordshire?
A single-storey extension typically takes 12 to 16 weeks from groundwork to handover. A double-storey extension takes 16 to 24 weeks. Larger wrap-arounds and heavily reconfigured layouts run longer. We give you a realistic week-by-week timeline as part of your detailed quote.
How much does a house extension cost in Hertfordshire or North London?
Do I need planning permission for my extension?
Can I stay in my home during the build?
Do you handle party-wall agreements?
What areas do you cover for extensions?
Ready to start your project?
Tell us a bit about what you’re planning. We’ll come back within one working day with next steps — or call 07850 763 556 to talk it through.
Have Questions? Talk to one of our experts