What could your extension cost?
Answer six quick questions and get an instant guide price for your extension in about 60 seconds.
Your guide price in three steps
Answer six questions
Your home, the type of extension, its rough size, your budget and when you hope to start.
See your guide price
An instant guide price appears on screen, based on the size and type of extension you chose.
Talk it through
Book a free call if you want to go further. There is no obligation and no hard sell.
Why no two extensions cost the same
The calculator gives you a sound starting point. These are the things that move the final figure.
Size of the extension
Floor area is the biggest driver. The calculator uses the width and depth you enter.
Single or two storey
A second storey adds structure and a roof above, but costs less per square metre.
Ground and foundations
Soft ground, drains or trees nearby can mean deeper or special foundations.
Roof and glazing
Roof lanterns, bifold or sliding doors and large windows all change the price.
Opening into the house
Taking out a back wall needs steel beams, engineer's calculations and a warrant.
Access to the site
Narrow or awkward access for diggers and deliveries adds time on site.
See one built, week by week
A single storey extension in Troon, built in eight weeks from the first dig to handover.
The project page shows every stage of the build, from foundations to the finished room.
Extension costs, explained
How accurate is the guide price?
It is a guide based on typical Ayrshire extensions of the size and type you choose. Your actual price is measured line by line from your drawings by our own Quantity Surveyors.
What does the guide price include?
Windows and doors, electrics, plumbing and heating, plastering and decorating. It does not include kitchens, bathrooms, floor finishes, window dressings or furnishings.
Does the guide price include VAT?
You can switch between prices with and without VAT on the results screen.
What happens after I get my guide price?
You can book a free call to talk it through. If it suits you, we arrange a site visit and CWJ Architectural Design Services can draw your extension.
Is my information shared?
No. Your details are only used by Cutwood Joinery & Construction to come back to you about your project.
Rather talk to someone?
Tell us what you have in mind and where you are. We will come back to you to arrange a site visit.