HOUSE
EXTENSION

Yes, planning policies and the interpretation of national rules can differ from one borough to another. Some key points to note: • Inner London boroughs (e.g. Islington, Camden, Westminster): Often stricter controls, especially in conservation areas or where heritage is a concern. Boroughs may have detailed design guides that set out what is acceptable. • Outer London boroughs (e.g. Bromley, Croydon, Barnet): Tend to offer more flexibility, particularly for rear and side extensions. • Neighbour consultations: Most councils will notify neighbours of your application, and their feedback could influence whether permission is granted. Each council publishes its local planning policies and design guides. It’s important to check these or seek professional advice to ensure your proposal aligns with local requirements. Additionally, fees and processing times for applications and approvals may vary slightly between boroughs.

London properties come in a wide range of styles — from Georgian and Victorian terraces to 1930s semis and modern houses — and several types of extensions are popular: • Rear extensions: Extend out into the garden, often creating open-plan kitchen/diner spaces. This is one of the most common ways London homeowners add space. • Side return extensions: Fill in the narrow side alley of Victorian and Edwardian terraces, transforming cramped kitchens into spacious living areas. • Wrap-around extensions: Combine a rear and side return extension, maximising ground floor space. • Double-storey extensions: Add space on two levels, often for an additional bedroom and a larger kitchen or living area. • Loft conversions: Convert unused roof space into habitable rooms — commonly combined with a rear extension to reconfigure the whole home. • Basement extensions: Particularly in prime areas like Chelsea or Hampstead where space is at a premium. These are complex, costly and often require planning permission and specialist contractors. The type of extension you choose will depend on your property type, your budget, and how much space you want to gain.

For most house extensions in London: • An architect or architectural designer will be key to developing a design that meets your needs, maximises space, and secures planning permission where required. They can also help manage approvals and oversee works. • A structural engineer is essential for structural calculations, particularly where steelwork is required (e.g. opening up walls, supporting upper floors, or creating large glazed openings). • Other consultants may include party wall surveyors (if your works affect shared walls or boundaries) and drainage consultants (especially for basements). Some design-and-build firms offer these services in-house, which can help streamline the process.

In addition to planning permission, you may need: Building Regulations approval for structural work, drainage changes, and extensions. A Party Wall Agreement if your work affects a shared wall. Freeholder consent for leasehold properties. Highways licences for skips or scaffolding on the street. Listed building consent for listed properties. Securing these approvals in advance is crucial to avoid enforcement action or costly remedial work.

Most house extension works in London are subject to 20% VAT, including materials and labour. However, a reduced rate of 5% VAT may apply if: Converting a building from commercial to residential. Working on empty properties (vacant for 2+ years). New-build residential houses are generally zero-rated for VAT. Confirm VAT rates with your contractor or a tax specialist, especially for complex projects.

A well-designed and well-executed house extension can significantly increase the value of your home, particularly in high-demand areas of London. Typical benefits include: • Increased living space, making the home more attractive to buyers. • Modernised layouts that suit contemporary living. • Enhanced energy efficiency if combined with fabric upgrades (e.g. better insulation, glazing). However, the value added depends on local market conditions, the quality of the work, and whether the space meets buyer demand in your area. Over-extending relative to plot size or the local market can lead to diminishing returns.

• Experience: Ensure your contractor has experience with house extensions in London, as local challenges (tight sites, planning rules, heritage issues) require expertise. • References and reviews: Ask to see completed projects and speak to past clients. • Contracts: Use formal contracts (e.g. JCT) and ensure the contractor understands CDM regulations (health and safety management). • Insurance: Verify that the contractor has appropriate insurance (public liability, employer’s liability, contractor’s all-risk). Choosing the right team is key to a smooth, successful extension project.