A single storey extension is one of the most popular ways Peterborough homeowners add space without moving. Prices vary widely, so here is an honest breakdown of what you might pay, what changes the number, and how to avoid nasty surprises.
As a rough guide for the Peterborough area, expect somewhere between £2,000 and £3,000 per square metre for a good quality single storey extension in 2026. A modest 15sqm rear extension might land around £30,000 to £45,000, while a larger 30sqm open plan kitchen and dining space often runs from £60,000 to £90,000 or more once finishes are included.
These figures cover the building work but not always kitchens, bathrooms, high end glazing or landscaping. Always check whether a quote is for a shell or a finished room, because that single distinction can shift the total by tens of thousands.
The biggest variables are the ground you are building on, the complexity of the roof and glazing, and the quality of the fittings you choose. A flat roof with standard windows is far cheaper than a vaulted ceiling with bifold doors and a lantern rooflight.
In and around Peterborough, drainage and ground conditions matter. Some areas near the Nene or on former fen land have higher water tables or poorer soil, which can mean deeper or engineered foundations and a higher bill before you are even above ground level.
The headline building price is rarely the full story. Design fees, structural calculations, Building Control charges and party wall agreements all sit on top and are easy to overlook when budgeting.
Many single storey rear extensions in Peterborough fall under permitted development, which avoids a full planning application, but you should confirm this with Peterborough City Council before assuming it. Even then you will need Building Regulations approval, and a lawful development certificate is worth having for future resale.
Ask for a detailed written quote that breaks down labour, materials and provisional sums rather than a single lump figure. This makes it far easier to compare builders fairly and spot where corners might be cut.
Be wary of any price that looks dramatically cheaper than the rest, as it often signals missing items that reappear as extras later. A slightly higher quote with clear specifications and a realistic timeline usually works out better value across the whole project.
Most single storey extensions take around 10 to 16 weeks of building work, depending on size and complexity. Design, approvals and lead times for materials can add a few months before work starts on site.
Many single storey rear extensions qualify as permitted development, but limits apply for size, height and how close you are to boundaries. Always check with Peterborough City Council first, and you will still need Building Regulations approval regardless.
A well built extension often adds value, particularly when it creates a modern kitchen or extra bedroom that buyers want. The uplift depends on your street and local ceiling price, so it is worth not over spending relative to nearby property values.
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