Policy DM1 is one of the most frequently cited refusal reasons in England. Here's what it actually means and what you can do about it.
DM1 stands for Development Management Policy 1. Almost every local planning authority has a policy with this name (or a similar number) in their Local Plan. It typically covers design quality, character, and the visual impact of new development on the surrounding area. When a council says your application is "contrary to Policy DM1", they mean they believe your proposed development — in terms of its size, appearance, or design — doesn't fit in with the character of the area.
Because it's broad. Policy DM1-type policies give planning officers wide discretion to refuse applications on design grounds. It's the planning equivalent of "we don't like how it looks." It's also the most commonly overturned reason on appeal — which matters.
Not automatically, but a DM1-type refusal gives you a solid appeal foundation. The Planning Inspectorate will look at whether the council's assessment was reasonable. If you can show precedent — similar developments approved nearby — you significantly strengthen your case. That's exactly what Planning Decoder's precedent finder does.
First, identify whether the refusal reason is the only ground or one of several. A single DM1 refusal is far easier to challenge than multiple grounds. Second, look for precedent — applications approved on your street or nearby with similar scale and design. Third, consider whether modest design amendments could resolve the officer's concern without a full appeal.
Paste your decision notice and we'll tell you in seconds whether your DM1 refusal is worth appealing.
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