Planning Permission for a New Build Home in London: What You Need to Know

Building a new home in London — on a plot acquired from a large garden, on a subdivision of an existing site, or on a vacant infill site — is one of the most complex planning scenarios in the UK. London is one of the most controlled planning environments for residential development, and understanding the process before committing to a site or design is essential.

New build residential development in London is assessed against the London Plan (the statutory development plan prepared by the Mayor of London), the relevant local authority development plan, and national planning policy. Unlike extensions and conversions (where Permitted Development provides a relatively clear framework), new build development in London requires a planning application in almost all cases, with no Permitted Development route to a new dwellinghouse.

Design quality is a primary concern for new build applications in London. The London Plan contains design policies that require development to be of the highest quality, respond to local context, and contribute positively to the public realm. Most London boroughs also have their own design guides and character area studies that set more specific expectations for particular neighbourhoods. A design that ignores the established character of the area in terms of scale, proportions, materials, and setbacks is likely to be refused.

Affordable housing obligations are a major consideration for larger new build schemes in London. The London Plan requires that residential developments of ten units or more provide at least thirty-five percent affordable housing on-site (fifty percent on public land). For smaller schemes below ten units, some boroughs have policies requiring affordable housing contributions or other planning obligations. These obligations can significantly affect the financial viability of a development and must be assessed early in the planning process.

For small-scale infill plots and garden subdivisions, the main planning issues are: whether there is a precedent for residential development in the location, whether the plot can achieve adequate outlook and amenity for both the new dwelling and neighbouring properties, whether vehicle and pedestrian access can be satisfactorily achieved, whether the density is appropriate for the character of the area, and whether the design is of sufficient quality.

Garden land subdivisions — taking a large rear garden and building a new house on part of it — are a common source of planning applications in London outer boroughs. Many boroughs have policies on the loss of garden land and may resist schemes that are considered to result in overdevelopment or harm to the character of garden settings. Engaging a planning consultant at the earliest stage helps assess the prospects before significant design cost is committed.

Building Regulations for a new build home in London are significantly more demanding than for an extension — the whole building must meet current standards for structure, energy efficiency, ventilation, drainage, fire, acoustics, and accessibility. Part M (accessibility) requires that new dwellinghouses meet Category 1 accessible and adaptable dwelling standards as a minimum.

RCB builds new residential developments across London as part of our principal contractor delivery service. +44 7359 872594 | connect@rcbGroup.co.uk | www.rcbGroup.co.uk