House Extensions More room, designed and built by one team
Experience straightforward house extensions in London with our expert touch. From initial design through to construction completion, our in-house team handles everything.
The smartest investment you can make in your London home
Planning house extensions in London? A house extension adds new space to your existing home — whether it's a bigger kitchen, an extra bedroom, or even a home office. At Salstan, we make it straightforward to get more room without moving. Furthermore, it pays off. A well-designed extension can increase your property's value by up to 20%.
Our team handles everything from initial design through to completion, all managed in-house.
Our Services
Everything you need, managed by one practice
Measured Surveys
Detailed site surveys capturing every dimension of your existing property.
Concept Design
Creative architectural concepts that maximise your space and light.
Planning Applications
Full planning submissions or permitted development guidance.
Building Regulations
Compliant designs meeting all current building standards.
Structural Engineering
In-house structural calculations and construction drawings.
Construction
Our own build team delivers your project to the highest standard.
Understanding house extension in London
Planning house extensions in London? A house extension adds new space to your existing home — whether it's a bigger kitchen, an extra bedroom, or even a home office. At Salstan, we make it straightforward to get more room without moving. Furthermore, it pays off. A well-designed extension can increase your property's value by up to 20%.
House Extension projects in London
Why choose Salstan for house extension?
- Over 1,000 projects completed across London
- In-house architects, engineers and builders
- Fixed-fee pricing with no hidden costs
- 130+ five-star Google reviews from clients
How we deliver house extension at Salstan
Our process explained in six easy steps
What our clients say about us
House Extension Plan Pricing
Fixed-fee packages with no hidden costs. Most London architects charge £2,000 to £7,000+ for plans alone.
- Full 3D measured survey with Lidar
- 3D architectural drawings
- Unlimited design changes per scope
- Planning submission and liaison
- Full support and expert advice
- Full building regulation drawings
- Technical specifications
- Expert building control advice
- Combined with structural package
- Full structural calculations
- Structural design drawings
- By chartered structural engineers
- Price varies by complexity
Prices shown are for single storey extensions. Double storey planning from £1,100 + VAT. View full pricing details
Let's Discuss Your Project
Share your project details and our team will review the scope, provide clear guidance, and come back with practical next steps — no obligation, just honest advice.
Tell Us What You're Planning
Extension, loft, new build — share your ideas using the form
We Review Your Project
Our architects assess your property and project requirements
Receive Clear Next Steps
Get a fixed-fee quote and a practical plan to move forward
Fill in what you can — we'll follow up with anything else we need.
Accreditations & Education
Trusted Experience Across Architecture,
Engineering & Construction
Our team’s background combines architectural design, structural engineering and construction delivery.
Civil Engineering
Institution of Civil Engineers
Structural Engineering
The Institution of Structural Engineers
City University London
Academic excellence in the built environment
Loughborough University
Academic excellence in design & innovation
UCL
Academic excellence in architecture & engineering
Civil Engineering
Institution of Civil Engineers
Structural Engineering
The Institution of Structural Engineers
City University London
Academic excellence in the built environment
Loughborough University
Academic excellence in design & innovation
UCL
Academic excellence in architecture & engineering
