Modern flat-roofed glass extension opening onto a lawn
House Extensions

House Extensions Built With Precision

Adding a house extension is one of the most valuable investments you can make in your South East London home. Whether you need a larger kitchen, an open-plan living space, or an extra bedroom, SpaceUp delivers extensions that feel like a seamless part of your original property — built to last, finished to perfection.rnStarting from £45,000, our extensions cover everything from structural groundwork to final finishes. You get one team, one point of contact, and zero surprises.rn
The Space Up Standard
Types of Extensions We Build

What’s Included:

  • Planning and structural calculations support
  • Full groundworks and foundations
  • Structural steelwork
  • Brickwork, roof, windows and doors
  • Insulation, plasterwork and all internal finishes
  • Plumbing, electrics and underfloor heating options
  • Full project management from start to finish
  • Rear single-storey extensions
  • Side return extensions
  • Wrap-around extensions
  • Two-storey extensions
  • Kitchen extensions with bi-fold or sliding doors
  • Open-plan kitchen-dining-living extensions
Brick rear extension with black bi-fold doors folded open onto a paved garden terrace
Rear extension with black bi-fold doors open onto a patio, looking through to the kitchen
Completed rear extension in matching brick with sliding patio doors and a new paved terrace
Rear extension in red brick with white uPVC patio doors, alongside newly laid block paving
Extension roof under construction, with tiles part-laid over battens and a rooflight fitted

Areas We Cover

Bexleyheath
Welling
Bexley
Sidcup
Dartford
Orpington
Petts Wood
Beckenham
Bromley
Croydon
South East London and north Kent
What our clients say

Real Reviews. Real Results.

House extension
“Space Up transformed our cramped kitchen into a bright, open-plan space we actually enjoy cooking in. The team was tidy, punctual, and kept us updated every step. Highly recommend for anyone in Greenwich considering an extension.”
House extension
“From design to finish, the whole process was smooth. Our kitchen extension added so much light and space to the house. Great communication throughout, no surprises on cost.”
House extension
“Really impressed with the quality of the build. The bespoke cabinetry and finish are exactly what we wanted. Professional crew, finished on schedule. Would use SpaceUp again.”
House extension
“We got quotes from three companies and SpaceUp were by far the most thorough. The finished kitchen extension exceeded our expectations — clean work, great attention to detail.”
Reviews on Checkatrade Reviews on Google
Completed rear extension in matching brick with sliding patio doors and a new paved terrace
South East London Since 2013
Why Choose Us

Why Choose Space Up for Your Extension

Estimated costs from £45,000 depending on size and specification
Transparent, fixed-price quotes with no hidden extras
Experienced structural and finishing teams
Local knowledge of SE London planning requirements
Verified reviews on Checkatrade and Google

Book a free home consultation and we’ll assess your space, discuss your ideas, and provide a clear written quote. No obligation.

Get a Free Quote
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