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Dismissed2 July 20253365330

1 Longbourn, Windsor, Berkshire, SL4 3TN

Planning appeal 3365330 at 1 Longbourn, Windsor, Berkshire, SL4 3TN (Royal Borough of Windsor and Maidenhead) was dismissed on 2 July 2025 by Inspector Andrews M, by written representations. The main issue, as the Inspector framed it: The effect of the proposed dormer extension on the character and appearance of the host dwelling, the terrace of which it forms part and its surroundings.

a side and rear ground floor extension; second floor loft conversion and conversion of existing garage into a part habitable and part storage area.

Authority
Royal Borough of Windsor and Maidenhead
Appeal type
householder · Householder (HAS)
Procedure
Written Representations
Development
residential · Householder developments
Inspector
Andrews M
Postcode
SL4 3TN

Main issues, as the Inspector framed them

  • The effect of the proposed dormer extension on the character and appearance of the host dwelling, the terrace of which it forms part and its surroundings

What decided it

The proposed dormer extension would undermine the design integrity and symmetry of the terrace, which was fundamental to the original design, and would be perceived negatively from the approach road and green space.

What the Inspector cited

Development plan policies
Policy QP3Borough Local Plan 2013-2033Borough wide Design Guide SPD
National Planning Policy Framework
Paragraph 12

How the Inspector dealt with each one is set out in the app, in order: the development plan, national policy, housing land supply, other considerations and the planning balance, beside the letter.

See how each was applied

The decision letter

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More decisions in Royal Borough of Windsor and Maidenhead

The authority’s record since 2016 · every decision in 2025

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The main issues, what decided it, the planning balance and the policies and judgments listed as cited are read from the published letter by Town Planner Pro and are our summary, not the Inspector’s words; the letter itself is the record. Contains public sector information licensed under the Open Government Licence v3.0. Research, not advice.

In the app this decision sits on the map beside every appeal around it, with its letter to read and the main issues, policies and judgments cited picked out.