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Islington · Local Plan · Policy

DH4 — Basement development.

How Islington actually applies DH4: who leans on it, where it bites hardest, and how often it's invoked. The policy text is the rule; this is the behaviour.

DH4 is a published Islington planning policy. This page records where it appears in the council's published planning decisions.

Cited under: Islington Local Plan (adopted)

Islington · DH4
Where DH4 is quoted — by ward
Fewer ~0
More citations ~2
Showing
re-scopes the headline figures and the trend
5
times cited
in parsed decision notices
1 appeal
appeal survival
1 dismissed · 0 allowed at appeal — too few to rate
2 of 22
officer reach
9% of officers recorded in this period
Junction
top hotspot ward
2 citations
What this policy is about

Policy DH4 restricts basement development in Islington to ensure it is proportionate to the site and context. The council will only permit basement development if it does not cause unacceptable harm to nearby buildings, trees, infrastructure, or heritage assets. Residential basement development must meet specific criteria, including limiting basement size, depth, and height, and preserving existing gardens.

Plain-English summary of the adopted policy text below. The full text is the rule; this is the gist.

The policy — as adopted

Basement development

All basement development must be proportionate to its site and context. B. The Council will only permit basement development where it is demonstrated to its satisfaction that the proposal would not cause an unacceptable degree of harm to: (i) the structural stability of the existing building, nearby buildings, trees and any infrastructure; (ii) the structural, ground, or water conditions of the area; (iii) the architectural character of the building; (iv) the character and amenity of the area; or (v) the significance of heritage assets including conservation areas and listed buildings. C. Applicants proposing basement development must provide evidence of the impact of basement development in the form of a Structural Method Statement (SMS), which satisfies the criteria in Part B. D. For residential basement development (including extensions): (i) a basement must cumulatively occupy less than 50% of the original garden and/or unbuilt area; or the area of a basement which is outside the footprint of the host building must total no more than 50% of the area of the footprint of the host building, whichever is the lesser; (ii) a basement must not involve excavation of more than one (1) storey below the lowest original habitable floor level; (iii) the height of a basement must not exceed 3m floor to ceiling height; (iv) where considered appropriate in the local context, lightwells and other external manifestations must be modest in size, discreetly located, and designed to protect and enhance the character and appearance of the area; (v) basements must be designed to preserve existing gardens, and must reinforce the visual relief that soft landscaping between buildings provides; and (vi) basement development must not significantly alter the prevailing garden level.

Verbatim from the adopted Islington plan · source document. The council's published plan is the authoritative version.

How it lands
80% in approvals · 0% in refusals
5 citations in the selected period
The approval/refusal split is subscriber intelligenceUnlock →
Where it bites
Junction2
St Peter's & Canalside1
Holloway1
What cites it — application types
all years on record · click a slice to filter
What it means in practice

Not filled in yet. This will hold how officers actually argue DH4 case by case, classified from their decision reports — the classification pass hasn't run. Nothing is paraphrased in its place.

What the published record shows

DH4 appears most often in Junction, St Peter's & Canalside, Holloway. It appears across 2 of 22 officers recorded in this period. The map shows the pattern for the selected period.

Who cites it — case-officer spreadfrom parsed decision notices · click an officer
Who leans on this policy — and how often — is subscriber intelligenceSubscribe to unlock →
Why it is cited — and what follows
80%
in approvals
4 citations
0%
in refusals
0 citations

This shows the decision reports in which DH4 appears. It does not yet claim that the policy caused those outcomes; 1 citations sit outside the approval/refusal split.

Reason · role · consequence

Not filled in yet — the classification pass over the citing passages hasn't run. When it has, this shows why DH4 was used, whether it supported approval or refusal, and what changed as a result. No conclusion is shown until that classification has been checked.

Why this policy is cited, and what follows, is subscriber intelligenceSubscribe to unlock →
Does it hold up? — appeal performance
— survival
1 dismissed · 0 allowed — 1 PINS appeal decisions cite DH4

From Planning Inspectorate decision letters that cite DH4. Dismissed = the council's refusal stood, the policy held; allowed = overturned. Too few decisive appeals for a rate — the counts are the record. The tighter join — this borough's own refusals citing DH4 traced to their specific appeals — is still to come.

Related — follow the thread
Islington
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Case officers
Islington's decision-makers
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Citations, officer spread, ward and application-type counts parsed from published Islington decision notices (high-confidence parses, approvals and refusals), joined to the canonical application record. One citation = one decision citing the policy. See the policy overview for every policy cited.

Atlas intelligence summarises patterns and observations from published planning records. Past decisions do not indicate how any future application will be determined. Every application is assessed on its own merits, having regard to the proposal, site, evidence and policies applying at the time. This information is provided for general information only and is not planning, legal, financial or professional advice.