Fixed fees. You know the cost before we start.
No hourly billing creep. No nasty surprises. Just a clear price for a clear scope — agreed in writing before any work begins.
Permitted Development
from £750
Garage conversions and simple projects that don't need full planning.
- ✓Feasibility check
- ✓Lawful Development drawings
- ✓Application handled
Householder Planning
from £950
Most extensions, lofts and conversions needing planning permission.
- ✓Live design session
- ✓Full planning drawings
- ✓Application submitted & managed
- ✓Building regulations drawings
Larger / Complex
Custom fixed fee
Bigger or sensitive sites, refused applications, or multiple buildings.
- ✓Everything in Householder
- ✓Specialist reports coordinated
- ✓Plan B if refused
Prices are a guide and exclude VAT. We confirm your exact fixed fee in writing after a free Build, Wait or Move Call, once we understand your home. It is never a percentage of your build cost.
Want to know what the build itself might cost? Try the extension cost calculator or read what's included in our offer.
Pricing questions
Is the fee really fixed?
Yes. We agree your design fee before any work starts. It doesn't move unless you change the scope, and we'd tell you first.
What's not included in your fee?
Council application fees, specialist surveys (like structural calcs) and the build itself are separate. We tell you about all of them up front.
Do I pay everything at once?
No. We split the fee into clear stages so you only pay as the work progresses.
What does the build itself cost?
Build costs are paid to your builder, not us. As a guide, most extensions cost £2,200–£3,200 per m² to build. We help you budget realistically.
Not sure whether to build, wait or move?
That's exactly what the call is for. We'll be straight with you — no pressure, no jargon, no nasty surprises.