From Passivhaus-standard builds to heat pump ready extensions, our architects, engineers and craftsmen deliver future-proof homes with superior insulation, triple glazing, MVHR systems and dramatically reduced energy bills.
Every extension is designed to exceed current regulations with superior thermal performance, airtight construction and renewable-ready services for a truly sustainable home.
Our architects design to Passivhaus principles with optimised orientation, thermal bridging elimination, continuous insulation and airtightness testing for exceptional energy performance.
High-performance triple-glazed windows and doors with thermally broken frames, warm edge spacers and low-e coatings delivering U-values as low as 0.8 W/m²K.
Continuous external wall insulation, high-performance roof systems and insulated foundations achieving wall U-values of 0.15 W/m²K or better throughout.
Mechanical ventilation with heat recovery systems recovering up to 95% of heat from extracted air, ensuring fresh, filtered air while maintaining energy efficiency.
Extensions designed for air source heat pumps, solar PV integration, battery storage and EV charging with appropriate electrical infrastructure and plant space.
Comprehensive guarantee covering structure, insulation, airtightness and MEP installations backed by dedicated aftercare support throughout.
A showcase of energy efficient extensions delivered for environmentally conscious homeowners across Hampstead, Camden and neighbouring areas.
A methodical approach ensures your extension achieves exceptional energy performance without compromising design or comfort.
We assess your property's current performance, discuss sustainability goals and create designs optimised for thermal efficiency, solar gain and natural ventilation.
Detailed thermal modelling, U-value calculations and MVHR design ensure your extension meets or exceeds target performance before construction begins.
Continuous insulation installation, airtightness detailing, thermal bridge elimination and quality control testing throughout the build process.
Airtightness testing, MVHR commissioning, EPC certification and comprehensive handover including system operation guidance and maintenance schedules.
Read what our eco-conscious clients say about their energy efficient extensions.
"Our heating bills have dropped by over 50% since the extension was completed. The MVHR system keeps the air fresh and the house at a constant comfortable temperature year-round."
"They designed our extension to accommodate a heat pump and solar panels. The attention to thermal bridging and airtightness was impressive – we achieved an EPC A rating."
"The triple-glazed extension is remarkably quiet and maintains temperature beautifully. Even during the heatwave, it stayed cool without air conditioning. Exceptional work."
Based in Hampstead, we deliver premium energy efficient extensions across North and North West London.
Hampstead Village, Frognal, Belsize Village, Swiss Cottage, Redington Road.
Primrose Hill, Regent's Park, Camden Square, Chalk Farm, Mornington Crescent.
West Hampstead, Queen's Park, South Hampstead, Kilburn, Brondesbury.
Abbey Road, Hamilton Terrace, Maida Vale, Lisson Grove, Little Venice.
Temple Fortune, Hampstead Way, North End, Childs Hill, Bigwood Road.
Canonbury, Barnsbury, De Beauvoir, Upper Street, Pentonville.
Highgate Village, Shepherd's Hill, Crouch End, Archway, Holly Lodge Estate.
Muswell Hill Broadway, Colney Hatch Lane, Alexandra Palace, Fortis Green.
Clear answers to the most common questions homeowners ask.
Share your project details and our eco specialists will respond within 24 hours.