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Planning application

12 Coombe Hill Road Mill End Rickmansworth Hertfordshire WD3 8ND

Granted Three Rivers 25/1385/FUL Full Application

Works: Extension

Permission granted. Work must normally begin within three years of the decision or the permission lapses.

Proposal

Construction of side extension to lower ground level, replacement rear terrace, stairs and balustrading at ground floor level

As published by the council, reference 25/1385/FUL

Application record

Reference
25/1385/FUL
Type
Full Application
Status
Decided
Decision
approved
Received
18 Aug 2025
Validated
22 Aug 2025
Decided
20 Oct 2025
Ward
Penn And Mill End
Parish
Non-Parished
Decision by
Delegated Decision
Postcode
WD3 8ND

Timeline

Dates from the published record

  1. 18 Aug 2025

    Received by Three Rivers

  2. 22 Aug 2025

    Validated

    Checked as complete and ready for consideration.

  3. 20 Oct 2025

    Decision issued: approved

  4. 24 Jul 2026

    Added to PlanIndex

Documents

Plans, drawings, consultee responses and the officer's report

23 documents on file for this application

A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.

Trade members open them from here.

Open the documents

What this grant of permission means

Three Rivers granted permission on 20 October 2025, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.

About full applications

A full application seeks permission for a complete, detailed proposal in one go, with siting, design, access and landscaping all fixed at this stage. More in our guide to planning application types.

Nearby applications

Within 500 metres

  • 10 Coombe Hill Road Mill End Rickmansworth Hertfordshire WD3 8ND

    24/0386/FUL Submitted 11 Mar 2024 26m away

    Loft conversion including roof alterations including front and rear dormer windows and fenestration

    Withdrawn Full applications Loft or dormer Roofing +1 27 docs

  • 10 Coombe Hill Road Mill End Rickmansworth Hertfordshire WD3 8ND

    24/1483/FUL Submitted 17 Sep 2024 30m away

    Loft conversion including installation of rear dormer and front rooflight.

    Granted Full applications Loft or dormer 25 docs

  • 8 Coombe Hill Road Mill End Hertfordshire WD3 8ND

    22/1667/FUL Submitted 5 Sep 2022 42m away

    Single storey rear extension, first floor extension and roof alterations including increase in ridge height and side dormer windows, front entrance porch and front fenestration alterations

    Granted Full applications Extension Loft or dormer +2 10 docs
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  • 8 Coombe Hill Road Mill End Hertfordshire WD3 8ND

    22/0714/FUL Submitted 14 Apr 2022 44m away

    Single storey rear extension, first floor extension and roof alterations including increase in ridge height and side dormer window, front entrance porch and front fenestration alterations

    Granted Full applications Extension Loft or dormer +2 11 docs
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  • 8 Coombe Hill Road Mill End Rickmansworth Hertfordshire WD3 8ND

    22/1161/PDE Submitted 16 Jun 2022 45m away

    Prior Approval: Single storey rear extension (depth 7 metres, maximum height 3.58 metres, maximum eaves height 2.90 metres)

    Granted Outline Extension 7 docs
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  • 7 Coombe Hill Road Mill End WD3 8NE

    20/1982/FUL Submitted 23 Sep 2020 55m away

    Single storey front extension and first floor rear extension

    Granted Full applications Extension 12 docs
    Small domestic

In Three Rivers

  • 26/1487/FUL Awaiting decision

    48 Valley Road Rickmansworth Hertfordshire WD3 4DS

    Demolition of existing car port; construction of a part single part two storey side and rear extension; alteration to the fenestration

    18 Sep 2026 Full applications
  • 26/1471/FUL Awaiting decision

    6 Sycamore Approach Croxley Green Rickmansworth Hertfordshire WD3 3TN

    Demolition of existing garage and front entry porch; construction of a single storey front, side and rear extensions; internal alterations; alterations to hardstanding

    16 Sep 2026 Full applications
  • 26/1167/FUL Granted

    22 Penrose Avenue Carpenders Park Watford Hertfordshire WD19 5AD

    Construction of single storey front and rear extension; alterations to fenestration; installation of roof lanterns

    20 Jul 2026 Full applications
  • 26/1456/FUL Awaiting decision

    1 Penn Way Chorleywood Rickmansworth Hertfordshire WD3 5HQ

    Construction of single storey side and rear extension; conversion of garage into habitable accommodation; removal of chimney stack

    14 Sep 2026 Full applications
  • 26/1452/FUL Awaiting decision

    3 Arnett Way Rickmansworth Hertfordshire WD3 4DA

    Construction of a single storey front extension and two storey side extension; partial conversion of garage into habitable accommodation; installation of roof lights; alterations to the fenestration; internal alterations

    14 Sep 2026 Full applications