6 practical tips for getting planning approval for a Green Belt extension in the West Midlands

As an architectural practice who’s successfully navigated Green Belt applications across the West Midlands, we know the route to approval is less about creative loopholes and more about careful respect for planning policy, context and clear communication. Here are seven hands-on tips drawn from how local planning departments assess proposals.

Start with the right rules – and the right facts

Green Belt policy is protective: extensions are only acceptable if they are not ‘disproportionate’ to the original dwelling. Permitted development rights can sometimes be used but are limited in scope. Local guidance from Coventry, Warwick and Stratford-upon-Avon Planning Authorities sets out expectations for householder proposals and is the first thing we check.

Do a thorough baseline: measure the ‘original dwelling’ and previous additions

Councils will include past extensions, outbuildings and sometimes garages in their volume/floor-space calculations. Getting the correct size of the ‘original dwelling’ avoids surprises and allows us to test whether your scheme can be argued as proportionate. Some Local Authorities use floor area (Gross Internal Area) while others use volume (meaning a 3D digital model is the easiest way to calculate).

Use pre-application advice — it’s worth it

All three Local Authorities (and this is our experience nationally) encourage pre-application meetings so you can resolve issues early and tailor the design to local priorities. The advantages of going for pre-app are weighed against the additional increases in cost and overall timescales but it usually shortens determination time after the application is actually submitted and reduces refusal risk.

Design within additional bulk and landscape fit

The key emphasis of Green Belt protection hinges on ‘openness’. Low profiles, subservient massing, recessive materials and generous landscaping that preserve views and prevent urbanising the countryside will strengthen your case, all fit compared against the ‘original dwelling’. Coventry’s householder guidance in particular promotes sensitive, contextual design and most West Midlands planning departments will use an approximate threshold of 30-40% bulk increase (either volume or floor area) to determine if an additional is ‘proportionate’.

Keep proposals modest – or justify them robustly

If an extension pushes beyond typical percentage increases, provide compelling planning justification: replacement of poor-quality buildings, demonstrable community or heritage benefits, clear sustainability gains, or very special design quality. Inspectors and officers will expect evidence; we will help you prepare it, whether that be through a well-worded Planning Statement, leveraging our expertise of local policy, or a series of illustrations demonstrating the visual impact and how it fits into the landscape.

Submit a comprehensive application for successful validation

The most common cause for planning delay is incomplete applications. The upfront cost of reports can become expensive and we will work with you to tailor the appropriate investment in specialist consultants to provide the correct level of information. Submit a complete application with scaled drawings, site sections, existing vs proposed plans, a design and access statement and a landscaping plan at a minimum. You may need an ecologist, an arboriculturalist, a landscape architect or a drainage engineer – we can make recommendations based on our established network.

Final note – we’ll support you

If you’re thinking of an extension in the West Midlands, our approach is to translate the policy into buildable, beautiful solutions: accurately calculating the ‘original dwelling’, seeking appropriate early officer engagement, and crafting carefully restrained designs, backed by planning policy. Contact us today to get some initial advice on your own home project.