12 Coomb Street, London, N1 8DJ

Planning appeal 6006126 at 12 Coomb Street, London, N1 8DJ (London Borough of Islington) was dismissed on 10 June 2026 by Inspector Simon J Cater, by written representations. The main issue, as the Inspector framed it: The effect of the proposed development on the character and appearance of the area, including whether the proposal would preserve or enhance the character or appearance of the Duncan Terrace/Colebrooke Row Conservation Area.

Change from front lower basement window to timber framed French doors; first floor rear extension above existing rear projection

Authority: London Borough of Islington
Appeal type: householder · Householder
Procedure: Written
Development: residential
Inspector: Simon J Cater
Postcode: N1 8DJ

Main issues, as the Inspector framed them

The effect of the proposed development on the character and appearance of the area, including whether the proposal would preserve or enhance the character or appearance of the Duncan Terrace/Colebrooke Row Conservation Area

What decided it

The proposed rear extension would materially depart from the established pattern of subordinate rear projections, appearing as a visually dominant and discordant addition that would harm the character and appearance of the conservation area with no public benefits to justify this harm.

What the Inspector cited

Development plan policies: Policy D4 of the London Plan 2021Policy HC1 of the London Plan 2021Policy PLAN1 of the Islington Strategic and Development Management Policies 2023Policy DH1 of the Islington Strategic and Development Management Policies 2023Policy DH2 of the Islington Strategic and Development Management Policies 2023

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.

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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.