A single storey extension is one of the most popular ways to transform a home. Whether you need a bigger kitchen, an open-plan living space, a home office, or simply more room for a growing family, a ground floor extension delivers immediate, usable space without the complexity of building upwards.

At Crownhill Building Services, single storey extensions are our bread and butter. We've built hundreds across Milton Keynes since 2006 — rear extensions that open up kitchens, side extensions that use wasted space alongside the house, and wrap-around designs that do both.

Every project is managed in-house from foundations to finishing touches. We handle the design, structural engineering, planning applications where needed, Building Control registration, and every trade from groundworks to plastering. You deal with one team throughout — the same team that's been working together for over 20 years.

Single storey extensions are often achievable under permitted development rights, meaning no planning permission is needed. We'll advise you on what's possible within PD limits and handle the full planning process if your project requires it.

What Can a Single Storey Extension Include?

The beauty of a single storey extension is its versatility. Common configurations include:

Open-plan kitchen-diner — the most popular request, knocking through the back wall to create a large, light-filled living space with doors to the garden
Home office or study — a dedicated workspace separate from the main living areas
Utility room — moving laundry and storage out of the kitchen into its own space
Downstairs bedroom or bathroom — essential for accessibility or multi-generational living
Playroom or family room — extra living space without sacrificing your existing rooms

Our Approach

We start with a free site visit to assess your property, discuss your ideas, and provide an initial estimate. From there, we produce drawings, handle all approvals, and give you a detailed fixed-price quote. The price we quote is the price you pay — no hidden extras or surprise costs.

A typical single storey extension takes 8-12 weeks to build, depending on size and complexity. We keep the site tidy, respect your home, and keep you informed at every stage.

Our Work