Expert design and planning for rear extensions, side returns, kitchen extensions and wrap-around designs across London. From concept to completion.
The most popular option for London homes. Extend your kitchen or living space into the garden with an open-plan layout. Many rear extensions qualify under permitted development, avoiding the need for planning permission.
Typical size: 3-8 metres deep. Cost: £40,000-£100,000.
Ideal for Victorian and Edwardian terraced houses across London. Infill the narrow alley alongside your kitchen to create a wider, more usable space with improved natural light.
Typical width gain: 1-2 metres. Cost: £30,000-£60,000.
Transform your kitchen into the heart of your home. Open-plan kitchen-diners are the most requested design in London. We incorporate bi-fold doors, skylights and modern layouts.
Cost: £50,000-£120,000 depending on specification.
Combine a rear and side extension for maximum additional space. Wrap-around designs work particularly well on corner plots and end-of-terrace properties.
Typical gain: 20-40sqm. Cost: £70,000-£150,000.
Not sure? We provide a free permitted development assessment for every project.
Single storey extensions in London typically cost between £1,500 and £2,500 per square metre for construction, plus design fees of 8-15% of the build cost. A typical 4m x 5m rear extension might cost £50,000-£80,000 including design, planning and construction.
Many single storey rear extensions in London fall under permitted development rights. You can extend up to 3 metres from the rear wall (6 metres with prior approval via a Larger Home Extension scheme, or 4/8 metres for detached houses). Side extensions, extensions in conservation areas, or those exceeding size limits require full planning permission.
The full process typically takes 6-9 months. Design takes 4-6 weeks, planning permission (if required) takes 8 weeks, and construction takes 10-16 weeks depending on size and complexity.
Under permitted development in London, you can build a single storey rear extension up to 3 metres deep (or 4 metres for detached houses) with a maximum eaves height of 3 metres. The extension cannot cover more than half the garden area and must not extend beyond the side wall facing a highway.
A well-designed single storey extension typically adds 5-10% to your London property value. In areas with high per-square-metre values, the return on investment can be significant, often exceeding the cost of the extension itself.
We design single storey extensions across London and the surrounding 20-mile area. Our local knowledge of borough-specific planning policies gives your application the best chance of approval.
Free consultation. high planning approval rate. Call us today.
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