Custom House Extensions Built to Last
Create more room for your growing family or lifestyle. We build rear, side, wraparound &
double-storey extensions across London — from drawings to handover.
Service Overview
A well-designed extension adds valuable living space and increases the value of your home. At Nath
Contractors, we manage the full process from initial consultation and design to construction and final
sign-off. Our experienced team builds beautiful, practical extensions that blend seamlessly with your home.
Types of Extensions We Offer
• Rear Extensions
• Side Return Extensions
• Wraparound Extensions
• Double-Storey Extensions
• Kitchen Extensions
• Utility Room Additions
• Garden Rooms & Outbuildings
Why Choose Us
Over 15 Years of Construction Experience
Help with Planning & Drawings
Full Project Management
High-Quality Materials & Finishes
Local Builders Covering All London Boroughs
Transparent Quotes, Insurance & Timelines
Gallery of Our Work
See our transformations across London
Before & After Transformations
Loft Conversion
South London
House Extension
West London
Kitchen Refurbishment
West London
Bathroom Renovation
West London
FAQs
Do I need planning permission?
In many cases, permitted development applies — but we can advise and assist with planning where
required.
How long does an extension take?
A single-storey extension typically takes 8–12 weeks, depending on scope and access.
Do you handle the full build?
Yes — we take care of everything from groundwork to roofing and finishing.
Looking to start your home project?
Free, no-obligation quotes