House Extensions in London & Surrey
Beautiful, practical space—kitchens, open-plan living, lofts and rear/side extensions. Design, approvals and build by one accountable team.
Extend the way you live
From kitchen-diners to multi-storey additions, Global Builders designs and builds high-quality house extensions across London and Surrey. We focus on light, circulation and thermal comfort—so the new space looks great and works every day.
Why choose us
- Design, structural engineering and build under one roof
- Clear program, tidy sites, respectful to neighbours
- Premium finishes and meticulous detailing
Where we work
Greater London & Surrey: Kingston, Richmond, Wimbledon, Croydon, Epsom, Guildford, Sutton and nearby areas.
Popular extension types & upgrades
Rear & Side
- Rear kitchen extensions with wide openings
- Side return infill to unlock usable dining space
- Two-storey rear/side for extra bedrooms & baths
Loft & Wrap-around
- Dormer and hip-to-gable conversions
- Wrap-around combos for dramatic open-plan layouts
- Rooflights, lanterns, gable glazing
Performance upgrades
- Underfloor heating, high-performance glazing
- Insulation, air-tightness and MVHR options
- Smart lighting, integrated storage & bespoke joinery
Finishes
Premium kitchens, large-format tiles, microcement, engineered floors and statement staircases—installed with crisp detailing.
From concept to completion
Design & approvals
- Measured survey, concepts and cost plan
- Planning or Permitted Development route
- Building Control, Party Wall, structural design
Build & quality control
Sequenced program with hold-point inspections. Photo updates, clean protection, and coordination between trades to keep finishes immaculate.
- Energy-efficient fabric and glazing details
- Tidy sites and neighbour-friendly working hours
- Snag, certify and handover with manuals
FAQs
How much does a house extension cost?
Budgets vary with size, spec and access. Share your plans—or ask us to design—and we’ll provide an itemised, fixed quotation.
Do you handle planning?
Yes. We manage planning/PD, Building Control and structural engineering, and coordinate Party Wall where needed.
Do you work in London and Surrey?
Absolutely. We cover Greater London and all Surrey boroughs with prompt site visits.
House Extension FAQs
Clear guidance on timelines, consents and finishes.
6–12 weeks build time for a single-storey rear, depending on size, structure and finishes. Two-storey projects take longer.
Often yes. We plan phases, maintain protections and keep the home safe and tidy.
High-performance insulation, triple glazing, MVHR, UFH and low-VOC finishes for comfortable, efficient homes.
Ready to plan your extension?
Tell us about your space—kitchen, living, loft or multi-storey—and we’ll prepare a clear proposal.