House Extension Cost in Leeds: 2026 Price Guide

• Side return infill: £17,000-£28,000
• Single-storey rear extension: £24,000-£52,000
• Double-storey extension: £52,000-£95,000 upwards

Three different Leeds housing types, three different extension briefs

A genuine back-to-back around Hyde Park or Woodhouse generally can't take a conventional rear extension at all, since there's no rear elevation to build from. A through-terrace in Chapel Allerton or Headingley can, but usually with the same access constraints as any Victorian terrace - narrow plots, little or no side access. Properties around Roundhay or in Horsforth tend to have considerably more room to work with, which changes what's practical rather than necessarily what's affordable.

Conservation areas

Chapel Allerton and Roundhay both carry conservation area status covering a meaningful part of Leeds's more substantial Victorian and Edwardian housing - extensions here typically need to respect the existing roofline and materials, which can push costs up even for a modest single-storey addition.

What pushes costs up

As with most Victorian terraced cities, skip and scaffold permits on narrow streets are a common extra that catches people out if a builder hasn't worked the area before - worth asking directly whether permit costs are included in a quote.