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Planning application

East Wing The Royal Marsden Hospital Downs Road Sutton SM2 5PT

Awaiting decision Sutton DM2026/00685

Works: Extension Small domestic

Read from the description, not a valuation. How we read the register

Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.

Proposal

Application to vary condition 1 (approved drawings), 5 (fire safety strategy), 6 (solar PV array details) and 7 (acoustic assessment) of planning permission Ref: DM2024/01127 for the 'Erection of a part one, part two storey upwards extension from the original single storey building to provide plant rooms/enclosures housing extraction ducts/flues and rooftop ventilation, provision of external access stairs, solar panels to new flat roof and alterations to the existing ground floor internal layout' to allow for reduction to the first floor footprint of the building, altered fire escape plan and route with alterations to external staircases, alterations to number of PV panels and locations of flue enclosures, relocation of chiller plants and installation of acoustic attenuators to chiller units.

As published by the council, reference DM2026/00685

Application record

Reference
DM2026/00685
Status
Pending Consideration
Received
4 Jun 2026
Validated
30 Jul 2026
Postcode
SM2 5PT

Timeline

Dates from the published record

  1. 4 Jun 2026

    Received by Sutton

  2. 30 Jul 2026

    Validated

    Checked as complete and ready for consideration.

  3. 11 Aug 2026

    Added to PlanIndex

  4. Decision

    Awaiting decision

    Decision expected by 24 September 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

    Sutton took a median of 56 days over the applications it decided in the last year.

What happens while it is decided

The process from here

This application is with Sutton for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.

The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.

About this record

Reading the register

This page mirrors an entry on the statutory planning register that Sutton is required to keep. The published feed for this record does not state which type of application it is, which is common for older entries and for some council systems; the register entry on the council portal will say, alongside the case officer and any consultation dates.

Every planning application follows the same broad path: submission, validation, publicity, then a decision by officers or committee. Our guide to planning application types explains the common types and what each can approve.

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