Design & Build: Transformative Home Extensions
Tailored Space for Your Lifestyle
Whether you’re looking to create an open-plan kitchen-diner or add a necessary home office, we specialize in the three most value-adding extensions in the Barnet and North London area:
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Single-Storey Rear Extensions: The gold standard for "heart of the home" kitchen expansions. Perfect for connecting your indoor living space to the garden with bi-fold or sliding doors.
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Side-Return & Wrap-around Extensions: Ideal for Victorian and Edwardian terraces. We maximize that "dead space" in the side alley to transform narrow kitchens into wide, light-filled family hubs.
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Double-Storey Extensions: The most cost-effective way to add both living space and extra bedrooms. By using the same foundations and roof, you often gain 100% more space for only 50-60% more cost.
Our 4-Step Extension Journey
"The Road to Your New Space"
Discovery & Design Audit: We start with a deep dive into your goals. Whether you have existing drawings (like the ones from your architect) or need a fresh concept, we audit the plans for "buildability" and budget efficiency. We look for the internal design wins that others might miss.
The Pre-Construction Phase: We handle the heavy lifting of bureaucracy. From submitting Building Control applications to serving Party Wall Notices and managing Permitted Development checks, we ensure your project is 100% compliant before a single spade hits the ground.
Precision Construction: Our site teams are specialists. We coordinate every trade—from the groundworkers and bricklayers to the carpenters and decorators—to ensure the schedule stays on track. You’ll receive regular updates so you’re always in the loop.
Quality Handover & Aftercare: A project isn't finished until the final snagging list is clear. We conduct a rigorous final inspection of all structural elements, insulation (ensuring peak U-values), and finishes. We leave you with a transformed home and all the necessary completion certificates.
Investment & Value: 2026 Extension Costs
Every project is unique, but having a baseline is essential for planning. In the current 2026 market, we categorize extension costs into three tiers based on the level of finish and structural complexity.
What’s Included? Our quotes are comprehensive. We factor in the "invisible" costs that often catch homeowners out:
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Structural Steels & Padstones: (Essential for that open-plan look).
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High-Performance Insulation: Meeting the latest 2026 Part L Building Regs.
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Project Management: One point of contact from start to finish.
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Waste Removal: Skip hire and site clearance.
The "Value Add": In North London, a well-executed kitchen extension doesn't just give you more room; it typically adds 15% to 25% to the overall property value. It’s an investment that pays for itself.
The Construction Collective Difference
Why Choose Us for Your Barnet Extension?
With 15 years of trade experience, we’ve seen the pitfalls of poorly managed builds. We’ve built our reputation on three core pillars:
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Design-Led Engineering: We don’t just follow drawings; we optimize them. Whether it’s suggesting a better steel layout for a truly flush ceiling or choosing the right high-density padstones (40N/mm2 as standard) for structural integrity, we build for longevity.
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Transparent Project Management: You aren't just hiring a builder; you're hiring a partner. From handling Building Control visits (ensuring the first inspection happens before the foundations are poured) to coordinating specialist trades, we manage the stress so you don't have to.
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Energy Efficiency as Standard: We exceed 2026 Building Regs. By using premium 115mm PIR insulation and air-tightness membranes, we ensure your new space is as cheap to heat as it is beautiful to look at.
Common Questions We Hear
Do I need planning permission? Many extensions fall under 'Permitted Development,' but we always recommend a Lawful Development Certificate for peace of mind.
Are you insured? Absolutely. We carry full Public Liability and Professional Indemnity insurance to protect you and your neighbors throughout the build.
When can we start? We typically have a 2–3 month lead time. This allows us to get the right specialist team in place for your specific project.