House Extension Cost in Sheffield: 2026 Price Guide

08 Aug 2026

Side return infill: £16,500-£27,500
Single-storey rear extension: £23,500-£50,500
Double-storey extension: £50,500-£91,000 upwards

Two separate cost drivers

Sheffield's hillside terrain means a meaningful share of extension projects, particularly around Walkley and parts of Crookes, need retaining structures or additional groundwork just to create a level base - a genuinely separate cost driver from conservation area restrictions, and the two sometimes overlap on the same project in Nether Edge.

Nether Edge's conservation area typically requires extensions to match original stone detailing and rooflines, pushing costs toward the top of the range regardless of the extension's actual size.

What pushes costs up further

Access on the narrower terraced streets remains a recurring factor across the city, as in any Victorian terraced city with steep, tight streets.

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Frequently asked questions

How much does a house extension cost in Sheffield?

A side return infill runs £16,500-£27,500, a single-storey rear extension £23,500-£50,500, and a double-storey extension £50,500-£91,000 upwards.

Why do extensions cost more in Nether Edge specifically?

Its conservation area typically requires extensions to match original stone detailing and rooflines, pushing costs toward the top of the range regardless of the extension's actual size - and sloping sites there can add retaining-wall costs too.