If you are weighing up a kitchen extension or a bigger living space, the first question is almost always about the money. This guide gives realistic 2026 figures for homeowners across Hull and the East Riding, and explains what actually moves the price up or down.
As a working guide for the Hull area in 2026, a straightforward single storey extension tends to land between £1,800 and £2,800 per square metre for the build itself. A modest rear extension of around 15 square metres often comes in around £30,000 to £45,000, while a larger open plan kitchen and dining space of 25 to 30 square metres can run from £50,000 to £80,000 or more.
These figures cover the structural build, but the finish makes a real difference. A basic shell costs far less than a space with bi-fold doors, underfloor heating, a fitted kitchen and quality flooring, so it pays to be clear about your specification early.
Two extensions of the same size can vary by tens of thousands of pounds. Ground conditions matter a great deal locally, as parts of Hull sit on soft clay and a high water table, which can mean deeper or wider foundations and added drainage work.
Access also affects labour. A terraced property with no side access means materials are carried through the house, which takes longer than a detached home with a wide driveway. Glazing choices, roof type, whether you move services like the boiler or soil pipe, and the level of kitchen and bathroom fit out all shift the final figure.
The headline build price is rarely the whole story. Set aside money for design and approvals before any bricks are laid, and keep a contingency for the unexpected once the ground is opened up.
Building control is required and structural calculations are usually needed. Many extensions in the East Riding fall under permitted development, but it is always worth confirming with the local authority rather than assuming.
Always compare like for like. A cheap quote often leaves out the kitchen, decoration or VAT, so ask for a written, itemised breakdown and check what is genuinely included before you commit.
Be wary of any builder asking for a large deposit up front or pricing well below everyone else. A fair payment schedule is tied to stages of work completed, and a reputable local builder will be happy to show you finished projects nearby and explain their timescales honestly.
Most single storey extensions take around 10 to 16 weeks on site once work begins, depending on size and finish. Design, approvals and structural drawings beforehand can add a couple of months, so plan the whole project over six months or more.
Many single storey rear extensions fall under permitted development and do not need full planning permission, but limits apply on size, height and how close you build to boundaries. Always check with Hull City Council or East Riding of Yorkshire Council before starting, as listed buildings and conservation areas have stricter rules.
Yes. Keeping the roof simple, choosing a standard rather than fully glazed design, and not relocating the kitchen or bathroom plumbing all save money without affecting quality. Spending where it counts, such as on foundations and insulation, while economising on finishes is usually the smarter approach.