In Yorkshire, a single-storey rear extension typically costs between £30,000 and £60,000, while a double-storey extension ranges from £60,000 to £120,000+. Costs depend on size, specification, ground conditions and location within the county. Yorkshire is generally 15–25% cheaper than London and the South East.
These are realistic price ranges based on good-quality construction in the Yorkshire and Humber region. Prices include materials, labour, Building Regulations compliance and a standard-specification finish. They do not include VAT, planning fees, structural engineer fees or furnishings.
| Extension Type | Typical Size | Yorkshire Cost Range |
|---|---|---|
| Single-storey rear extension | 15–25 m² | £30,000 – £60,000 |
| Double-storey extension | 30–50 m² | £60,000 – £120,000+ |
| Side return extension | 10–20 m² | £25,000 – £45,000 |
| First-floor extension | 15–30 m² | £45,000 – £85,000 |
| Wrap-around extension | 30–60 m² | £55,000 – £110,000+ |
| Over-garage addition | 15–25 m² | £35,000 – £65,000 |
Labour rates and contractor overheads in Yorkshire are typically 15–25% lower than London and the South East. Hull and the surrounding area — including Beverley, Hessle, Cottingham and East Yorkshire villages — sits at the more cost-effective end of the regional scale, while still offering the same quality of construction and materials.
The single biggest driver of cost. A larger footprint means more materials, more labour and a longer programme. However, larger extensions often benefit from economies of scale — cost per m² tends to reduce on bigger projects.
Standard brick and tile construction costs less than contemporary flat-roof designs with large glazing panels. An extension with bifold doors, underfloor heating and a fitted kitchen will cost significantly more than a basic shell. Your specification choices can easily add £10,000–£30,000 to the base build cost.
Poor ground conditions — soft soil, high water tables, proximity to trees — can increase foundation and groundwork costs substantially. A site investigation or trial pit is often money well spent before committing to a design.
Opening up the rear wall of a house to connect an extension with the existing living space requires structural steelwork. The more walls you remove and the larger the opening, the higher this element of the cost.
Extensions in tight urban terraces or homes with limited side access typically cost more due to restricted working space and the logistical challenge of getting materials to the rear of the property.
In most cases, yes. A well-executed extension in Yorkshire typically adds 10–20% to property value, and in many areas of East Yorkshire and the East Riding, the uplift in value can exceed the build cost — particularly on larger properties in sought-after villages like Kirk Ella, Swanland, Beverley and Cottingham.
Beyond the financial return, the lifestyle benefit is often the primary motivator: more space for a growing family, avoiding the cost and disruption of moving, and a home that genuinely fits how you live.
See our full guide: Extension vs moving house — which is better?
The only way to get an accurate price is a site visit. Costs vary significantly based on the specifics of your home, your plot, and what you want to achieve. A reputable contractor will visit the site, discuss your plans, and provide a detailed written quotation before any work begins.
T3 Developments provides free, no-obligation site visits and quotations for all extension projects across Hull and East Yorkshire. Contact us here →
T3 Developments builds home extensions across Hull and East Yorkshire. Free site visit, no-obligation quotation.
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