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Planning appeal decision

Dismissed18 June 20266008995

37 Thornhill Road, London, N1 1JS

Planning appeal 6008995 at 37 Thornhill Road, London, N1 1JS (London Borough of Islington) was dismissed on 18 June 2026 by Inspector A Graham, by written representations. The main issue, as the Inspector framed it: The effect of the proposal upon the character and appearance of the Barnsbury Conservation Area.

Mansard roof extension with dormer windows and alteration to the front garden including installation of new entrance gates

Authority
London Borough of Islington
Appeal type
householder · Householder
Procedure
Written
Development
residential
Inspector
A Graham
Postcode
N1 1JS

Main issues, as the Inspector framed them

  • The effect of the proposal upon the character and appearance of the Barnsbury Conservation Area

What decided it

The proposed roof extension would be overly dominant and visually prominent, causing harm to the character and appearance of the Barnsbury Conservation Area by diluting the characteristic flat roof form that is an important feature of the area.

What the Inspector cited

Development plan policies
London Plan Policy D4London Plan Policy HC1Islington Local Plan Policy PLAN1Islington Local Plan Policy DH1Islington Local Plan Policy DH2
National Planning Policy Framework
Paragraph 125

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 London Borough of Islington

The authority’s record since 2016 · every decision in 2026

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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.