House extension costs · Harrow
House extension costs in Harrow.
Extension costs are driven by size, structure, glazing and the kitchen or living space that goes inside. We price from your drawings, or help you get them prepared.
Harrow has many inter-war semi-detached and detached houses with room for hip-to-gable lofts and rear extensions.
What affects the price.
Size and storeys
Single-storey, double-storey, side-return or wrap-around.
Foundations
Ground conditions, trees and drains can change the foundation design.
Steelwork
Opening up the back of the house usually needs structural steel.
Glazing
Sliding doors, rooflights and slim-frame glass vary widely.
Kitchen and finishes
Kitchen supply, flooring and heating choices.
Party walls
Work on a shared boundary needs the party wall process.
Other areas
Pricing work in Harrow?
Send us your plans for a tailored estimate.