
Build it once. Build it right.
A family-run construction firm building extensions, new builds and refurbishments across London. Fixed pricing, one project lead, twenty years on the tools.
Takes 90 seconds. No obligation. Reply within one working day.
0+
Years
London since 2005
0
Reviews
Five-star, every client
Fixed
Pricing
Itemised cost plan
0%
In-house
No subcontractors
“A complete renovation, two storey side and rear extensions plus a full interior redesign with five en-suite bathrooms. Mandip managed and delivered on budget. As a fussy person with a strong focus on detail, the results are very pleasing and of high quality.”
Avtar
Digital Partner, Watford
What we do
Six disciplines.
One seamless team.
Same trades, same standards, same project lead, across every job.
01Extensions
Single, double and wrap-around extensions that quietly extend the home you already love.
02New Builds
Ground-up homes built to last a generation, finished to a standard you can stand behind.
03Refurbishments
Whole-house refurbishments that respect the original fabric and modernise where it counts.
04Loft Conversions
Mansards, dormers and hip-to-gables that add a proper room without feeling like an attic.
05Kitchens & Bathrooms
The two rooms that work hardest. Built to take it.
06Groundworks & Landscaping
Foundations, drainage, driveways and gardens, the things that hold everything else up.
Live across London
Featured projects.
Every project runs the way you would, if you had the time.
No stranger turning up unannounced. No surprise bill on the final week. No vague provisional sums for the things every builder can quote.
Our own carpenters handle skirting, architraves, fitted joinery and the final finish, same hands from first fix to handover.

How it works
From first call to final snag.
01
Consult
Understand your goals and project scope.
02
Plan
Design, approve and finalise every detail.
03
Build
Expert construction with clear communication.
04
Deliver
Handover, finish and ongoing aftercare.
01
Consult
Understand your goals and project scope.
02
Plan
Design, approve and finalise every detail.
03
Build
Expert construction with clear communication.
04
Deliver
Handover, finish and ongoing aftercare.
In their words
What homeowners actually say.

The Studio
From the first call
to your final snag.
Wasti Developments started in Hayes in 2005 on a single rear extension. Twenty years on, we’re still a small studio, directors on site every week, the same project lead per client, never more than three live builds at a time.
FAQ
Quick answers to common questions.
Anything else, just call the office on 8am-6pm weekdays.
Across Greater London and the western home counties, Hayes, Ealing, Hounslow, Uxbridge, Richmond, Kingston and surrounds. If we can't reach in under an hour, we'll say so on the call.
Yes. We work with planning consultants and structural engineers on permitted-development, householder applications, and full-plans applications, and submit building-regulations notices ourselves. The paperwork is part of the price.
Fixed itemised cost plan after the drawings stage. No vague provisional sums for the obvious things. Any change order is in writing before any work starts.
£5m public liability, £10m employer's liability, all-risks contract works cover. TrustMark and FMB-affiliated. Documents are sent before contracts are signed.
Single-storey rear extensions: 12-16 weeks. Two-storey extensions: 16-22 weeks. Whole-house refurbishments: 16-28 weeks. New builds: 9-14 months. Always an estimate until the drawings are settled.
12 months on workmanship from the date of completion, plus the manufacturer warranty on every fitted product. We document the snagging walk and close it before final payment.

Ready to begin






