Plotline — Property Feasibility & Value Check

Plotline

Feasibility & value · England & Wales

Put in a postcode and the change you're considering. You'll get whether it's likely permitted, a build-cost range, the value it could add, and whether the numbers stack up — before you pay anyone for drawings.

How an extension is measured

The rear projection is measured from the original rear wall — not from any existing extension. The new roof must not rise above the eaves (where the main roof meets the wall).

Postcode UK postcode — we'll detect the authority and the right rules. Property type Permitted-development limits differ by type.

What do you want to do?

Rear projection (m) How far it sticks out beyond the existing rear wall. New floor area

Approximate added floor space (m²).

Finish level

Drives the build-cost rate. Current property value (£) Optional — needed for the £ value-added figure.

— Confirm anything that applies to the property:

In a conservation area A listed building Under an Article 4 direction In a flood-risk zone

Indicative only. This is a screening tool, not planning advice or a formal valuation. Permitted-development rules carry conditions a screen can't see (height, boundaries, prior extensions, Article 2(3) land). Confirm with the local planning authority and a RICS surveyor before committing money.