House Extensions
Expand your living space with a beautifully designed extension
Extension Builders Cornwall
Need more space but love where you live? An extension lets you stay put and spread out. Bigger kitchen, extra bedroom, home office — we build what you need, where you need it.
Rear extensions, side returns, double storeys, wraparounds — we've built them all across Cornwall. Our team sees projects through from first sketch to final coat of paint.
Planning permission, Permitted Development, Building Regs — we know the rules and we know the planners. We'll tell you what's possible before you commit.
GET A FREE QUOTE
Types of Extensions We Build
Single Storey Extensions
Rear, side, or wrap around the corner. Often under Permitted Development — no planning wait.
Double Storey Extensions
Two floors of new space on the same footprint. More room without losing half your garden.
Kitchen Extensions
Knock through, push out, get the kitchen-diner you've been dreaming about since you moved in.
Garage Conversions
That garage full of junk? Could be a bedroom, office, or gym. We do proper conversions, not DIY bodges.
Loft Conversions
Bedroom, office, en-suite — that empty roof space can earn its keep.
Basement Conversions
Dig down when you can't build out. Cinema rooms, gyms, extra bedrooms — all possible underground.
Related Services
Loft Conversions
Transform your attic into a bedroom or home office.
Garage Conversions
Convert your garage into valuable living space.
New Build Homes
Build your dream home from the ground up.
Barn Conversions
Transform agricultural buildings into characterful homes.
Period Property Renovation
Specialist work on character properties and conservation areas.
Frequently Asked Questions
Do I need planning permission for a house extension in Cornwall?▼
Many single-storey rear extensions fall under Permitted Development and don't require planning permission, provided they meet certain size limits. However, if you live in a conservation area, AONB, or have had previous extensions, you may need permission. We can advise on your specific situation during a free consultation.
How much does a house extension cost in Cornwall?▼
House extension costs in Cornwall typically range from £1,800 to £2,500 per square metre, depending on specification, access, and complexity. A single-storey rear extension usually costs between £40,000 and £80,000. We provide detailed, fixed-price quotes after a site survey.
How long does a house extension take to build?▼
A typical single-storey house extension takes 8-12 weeks from start to finish. Double-storey extensions generally take 12-16 weeks. This includes foundations, construction, plastering, and final finishes. We provide a detailed timeline during the planning phase.
Will an extension add value to my Cornwall home?▼
Yes, a well-designed extension typically adds 15-20% to your home's value in Cornwall. Kitchen extensions and additional bedrooms offer the best return on investment. We design extensions that enhance both your living space and property value.
Thinking About Extending?
Give us a call or drop us a message. We'll come round, look at what you've got, hear what you want, and give you honest advice on what's possible.
START YOUR PROJECT