Mia James Construction
One moment…
One moment…
A quick ballpark in under a minute — we've started you with a sensible single-storey extension. Open any line, in any order, and watch the range follow.
The single biggest decision — it sets the base rate for every square metre.
The floor area of the new space — pace it out on the lawn if you like.
A generous single-room extension
How the new rooms are finished once they’re built.
What the new space stands on.
Doors opening into or refreshed by the new layout.
From 0 to 15.
New or replaced windows across the project.
From 0 to 15.
We hand the space over sparkling, not just broom-clean.
An estimate, not a quote — priced properly after a free visit.
Estimate basis · extension ratebook HE-2026-07.1