What are the most common reasons planning applications get refused in Merton?

Planning refusals in Merton don't always happen because a project was poorly designed or obviously out of place. They happen because homeowners didn't know what applied to their specific property before they applied. The rules aren't the same on every street, and most people find that out the hard way. If you're trying to figure out where you stand before submitting, WhatCanIBuild shows you what's actually been approved and refused near your address — and why.

Your location within Merton matters more than you think

Merton isn't a uniform borough. Wimbledon Village and Merton Park carry conservation area designations that come with restrictions most homeowners don't realise exist until they're already in the process. The south of the borough includes Green Belt land. Article 4 directions are in force in several areas, removing permitted development rights that would otherwise apply everywhere else.

The problem is that these designations don't always follow obvious boundaries. A conservation area doesn't stop at the end of a named street. Two houses on the same road can be subject to entirely different rules. Most homeowners assume they'd know if something unusual applied to their property. Usually, they don't.

Character and appearance refusals are more subjective than they look

One of the most common reasons applications get refused is that the proposal is judged to harm the character or appearance of the surrounding area. That sounds vague — because it is. Planning decisions have to be made in line with the local development plan, and Merton Council will assess whether your project is in keeping with the street scene, the building itself, and the wider neighbourhood.

What that means in practice depends entirely on context. A rear extension that sailed through on a Victorian terrace in one part of the borough might be refused for the same reason on a similar property somewhere else in Merton. There's no universal answer. The question is what's been approved and refused on your street — and that's not something you can easily piece together yourself.

Impact on neighbouring properties is rarely straightforward

Overlooking, loss of light, and overbearing impact on adjacent properties are consistently cited in refusals. But the threshold for what's considered unacceptable isn't fixed. It depends on how your property sits relative to your neighbours, the orientation of your plot, and what already exists nearby.

Most homeowners don't realise that a project can tick every box they're aware of and still get refused because of how it interacts with a specific neighbouring property. The officer's assessment will consider factors you may not have thought to check — and by the time you find out, you've already paid the application fee.

Your specific combination of constraints is what actually matters

Knowing you're in a conservation area is one thing. Knowing what that actually means for a loft conversion, a side return, or a garden room on your specific plot is something else entirely. The same applies to Article 4 directions, listed building curtilage, flood zones, and any number of other overlapping designations that can shift the picture significantly.

The best way to understand your actual position — not just the general rules — is to see what's happened on similar projects near your property. WhatCanIBuild pulls together approval and refusal data for your area so you can see your real odds before you commit to anything.

If you want to see exactly what constraints apply to your address, what's been refused nearby, and what your project's approval chances actually look like, WhatCanIBuild gives you a property-specific picture that general guidance simply can't.