A ground-up contractor. Not a marketplace.

The Extension Works is the homeowner-facing arm of Esskay Homes Limited — a Berkshire-based building company that has spent the past decade refining a single, narrow product: the single-storey rear extension done properly.

We hold the architectural design, the structural calculations and the on-site team in-house. Building Control is booked under our name. There is one phone number, one project lead, one warranty, and one fixed price written down before a spade goes in the ground.

The website you are using exists because that whole proposition can — and should — be self-served. You shouldn't have to wait three weeks for a quote to find out an extension is going to cost more than your kitchen budget. So we built a configurator that gives you the honest number in minutes.