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
Erith
Blackheath
Sidcup
Dartford
Orpington
Chislehurst
Petts Wood
Beckenham
Bromley
Croydon
South East London and north Kent

House extensions we have built

Living room with a fitted media wall, electric fire and slatted panelling
Full refurbishment and rear extension
Bexleyheath, DA7
A three-bedroom house refurbished throughout, with a rear extension the full width of the house. 114 photographs.
See the full refurbishment and rear extension
Dark grey kitchen with a white quartz island and two pendant lights
Kitchen extension and rewiring
Beckenham
A kitchen extension and rewiring, with a new kitchen supplied and fitted.
See the kitchen extension and rewiring
Completed rear extension in brick with white bi-fold doors onto the garden
Kitchen extension
Bromley
A single-storey kitchen extension at the back of a house in Bromley.
See the kitchen extension
Completed rear extension in brick with new paving, seen from the garden
Side extension with utility and WC
Brockley, SE4
A 10 square metre side extension with a utility room and WC, and two Velux windows in the roof.
See the side extension with utility and wc
Sage green kitchen with a marble-topped island and range cooker
Kitchen and dining room opened up
South Norwood, SE25
A ground floor opened up on steel, joining the kitchen and dining room, with sliding doors on two sides of the rear corner.
See the kitchen and dining room opened up
What our clients say

Real Reviews. Real Results.

Full house refurbishment
“Yuriy (spaceup team did an excellent job of fully refurbishing our six bed Georgian end of terrace. Everyone was punctual, polite and good at their job. A special callout to Sergey (tiler) for his excellent work and plumber for his attention to detail. We’re really happy with the results, would hire Spaceup again to do side extension later in next year , and definitely recommend to anyone who wants good work quality .”
Job location: SE13
Total kitchen renovation
“Im so thankful we had Yuri for this project. Right from the start, it was evident that he would complete the work to a high standard, but he managed to exceed our expectations and the final result is amazing! Yuri and his guys are clearly very skilled, with a strong focus on detail. They worked incredibly hard- at times going above and beyond- and were able to confidently deal with unforseen issues. Absolutely recommend Yuri, he’s a really nice guy who genuinely cares and delivers outstanding results”
Job location: SE18
Flat renovation
“After receiving about 5 quotes and listening to the ideas of various builders I decided to go with Yuriy. Yuriy has truly transformed my small 1 bedroom flat into arguably the best flat I have ever had. His ideas, attention to detail and overall approach has been fantastic. He is a gentleman that has a highly skilled supporting team. You won’t be disappointed in using Yuriy. I took a risk not knowing him before but I am so glad I trusted him, the end result is truly remarkable.”
New walls and alcove build
“I was so pleased with the whole experience including the end result. Yuriy was thorough, knowledgeable, polite, and very considerate, all for a very reasonable price. His workmen were highly skilled and conscientious and they always cleaned up thoroughly. The whole team showed expertise and an in-depth knowledge of their crafts. Yuriy was also very trustworthy, he kept to schedule and produced an extremely professional end result. I will definitely recommend him to others and enjoy their gratitude.”
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
10 years warranty

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

Enquire to get a free quote
Call on WhatsApp Chat on WhatsApp