Council planning record

Installation of three external air-conditioning condenser units within the two existing rear courtyards/lightwells at ground-floor level. Two condenser units will be located within the left-hand courtyard and enclosed within a purpose-built acoustic enclosure, while one condenser unit will be located within the right-hand courtyard and screened by a multi-panel acoustic screen. The proposed acoustic mitigation measures are intended to minimise operational noise and reduce the impact on neighbouring residential properties. The installation will include the necessary associated works to support the operation of the condenser units. No change of use is proposed as part of this application.

27 Chiltern Street London W1U 7PJ

PendingReference: 26/07070/FULLCity of Westminster

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Application summary

Status
Pending
Application type
Full Planning Permission Application
Received
15 Oct 2026
Validated
15 Oct 2026
Determination deadline
Not published
Local authority
City of Westminster

Application overview

Installation of three external air-conditioning condenser units within the two existing rear courtyards/lightwells at ground-floor level. Two condenser units will be located within the left-hand courtyard and enclosed within a purpose-built acoustic enclosure, while one condenser unit will be located within the right-hand courtyard and screened by a multi-panel acoustic screen. The proposed acoustic mitigation measures are intended to minimise operational noise and reduce the impact on neighbouring residential properties. The installation will include the necessary associated works to support the operation of the condenser units. No change of use is proposed as part of this application.

Proposal details

Reference
26/07070/FULL
Alternative references
PP-15165556
Ward
Marylebone
Agent
Parallel Projects

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Application location

27 Chiltern Street London W1U 7PJ

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Documents 12 of 12

DocumentPublishedAction
RECEIPT OF APPLICATIONOther · PDF19 Oct 2026View
APPLICATIONFORMREDACTEDApplication Form · PDF15 Oct 2026View
HERITAGE, DESIGN & ACCESS STATEMENTHeritage Statement · PDF15 Oct 2026View
27_CHILTERN ST_NOTICE 1 - CONDENSERSBackground Papers · PDF15 Oct 2026View
NOISE IMPACT ASSESSMENT ACOUSTIC REPORTNoise impact assessment · PDF15 Oct 2026View
SITE PLANDrawing · PDF15 Oct 2026View
EXISTING LEFT LIGHTWELLDrawing · PDF15 Oct 2026View
CONDENSER_PHOTO_LEFT LIGHTWELLPhoto · PDF15 Oct 2026View
PROPOSED LEFT LIGHTWELLDrawing · PDF15 Oct 2026View
EXISTING RIGHT LIGHTWELLDrawing · PDF15 Oct 2026View
CONDENSER_PHOTO_RIGHT LIGHTWELLPhoto · PDF15 Oct 2026View
PROPOSED RIGHT LIGHTWELLDrawing · PDF15 Oct 2026View

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