Top 5 Planning Tips for a Successful London Extension

Extending your home is one of the most effective ways to add space, light, and value. In London, however, with its dense urban fabric and varied council policies, the planning process can feel daunting. Whether you’re considering a side return, loft conversion, or full-width rear addition, here are five key tips to guide you through.

1. Check if You Need Planning Permission

Not every project requires full planning approval. Many extensions fall under permitted development rights. However, these rights are often restricted in London, especially in conservation areas or for listed buildings. Before starting, check with your local planning authority to avoid unnecessary delays.

2. Understand Local Character and Policies

London boroughs place strong emphasis on how extensions fit into their context. Councils look for high-quality design that complements the existing building and surrounding streetscape. Using sympathetic materials, rooflines, and proportions will improve your chances of approval. Reviewing your borough’s design guidance at an early stage can save time later.

3. Maximise Light and Space Within the Rules

Daylight and privacy are major considerations when designing in built-up areas. Extensions are often tested against the 25-degree and 45-degree rules, which assess whether a proposal blocks too much natural light or dominates a neighbour’s outlook. Smart design solutions, such as rooflights, glazed doors, and open-plan layouts, can help you achieve a bright and welcoming extension while respecting these rules.

4. Prioritise Sustainability

Energy efficiency is increasingly at the heart of planning decisions. Choosing high-performance insulation, triple glazing, and low-energy lighting will reduce your bills and make your extension future-ready. Where possible, consider sustainable features such as green roofs or solar panels — councils often view them favourably.

5. Talk to Your Neighbours Early

In London, neighbour objections are one of the most common causes of delay. Concerns usually centre on loss of light, privacy, or views. Having an open conversation and showing your initial plans can go a long way in building trust and avoiding conflict during consultation.

Final Thoughts

An extension can transform your home, but the planning process in London requires careful preparation. By understanding local policies, prioritising sustainability, and engaging neighbours early, you can create a design that not only gains approval but also enhances the way you live.

 At Studio AVC, we specialise in residential design across London — from bespoke home refurbishments to new-build houses and apartment developments. If you’re thinking about extending your home, we’d be delighted to discuss how we can help.

 Contact us to start planning your project.