House Extension Cost in Liverpool: 2026 Price Guide

• Side return infill: £16,500-£27,000
• Single-storey rear extension: £23,000-£50,000
• Double-storey extension: £50,000-£90,000 upwards

The Georgian Quarter is a different planning conversation

Canning and the streets around Liverpool's two cathedrals hold genuinely significant Georgian architecture, much of it listed or within the Georgian Quarter conservation area - extensions here typically need materials and detailing that match substantial original buildings, which pushes costs toward the top of the range regardless of the extension's actual size, and often requires Listed Building Consent on top of standard planning permission.

Elsewhere in the city

Aigburth, Allerton, Mossley Hill and Wavertree are predominantly Victorian and Edwardian terraces and semis, extended under the more familiar rules that apply to most UK terraced housing - access on the narrower streets remains the main cost driver, much as in any Victorian terraced city.

Post-war rebuilding

Because parts of Liverpool were rebuilt after heavy Blitz damage, not every older-looking property actually has genuine Victorian-era foundations - worth having a structural engineer confirm the property's actual age and construction before finalising an extension design.