21 Windmill Hill London NW3 6RX Data via plota.co.uk
Proposal
Replacement of the existing side extension, replacement of existing windows, doors and gates, external shading, alterations to the existing roof coverings, introduction of two new dormers, alterations to the external landscaping including increasing the height of an existing South-West boundary wall, replacement of the existing garage with a smaller outbuilding, installation of solar PVC on the roof and ASHP in the garden. Data via plota.co.uk
Application progress
Under consideration
No decision has been issued yet. Plota predicts a decision around 15 Mar 2027, from Camden's recent demolitions.
Site constraints 9
Show all 43 with distances
- 23 mFrognal RiseGrade II
- 29 mFive Lamp PostsGrade II
- 34 mTerrace LodgeGrade II
- 46 mNumbers 2 and 3 and Attached RailingsGrade II
- 46 m1, Lower TerraceGrade II
- 50 mGarden Gates, Railings and Walls to Fenton HouseGrade II
- 51 mFountain HouseGrade II
- 55 mGrove LodgeGrade II
- 55 mFenton House GarageGrade II
- 64 mFour Garden Statues and A Cistern in the Grounds of Fenton HouseGrade II
- 65 mAdmiral's HouseGrade II
- 69 mNetley CottageGrade II
- 71 mThe GardensGrade II
- 81 mGarden Wall to Number 10 Netley CottageGrade II
- 86 mFenton HouseGrade I
- 87 mUpper Terrace House and Attached WallsGrade II
- 91 mBoundary Wall to Admiral's House, 25 Hampstead Grove and Grove End, Admiral's Walk, Hampstead Grove and Upper TerraceGrade II
- 93 mVolta House, Bolton House, Windmill Hill House and Enfield HouseGrade II
- 100 mRailings to Water ReservoirGrade II
- 101 m1, Upper TerraceGrade II
- 103 mNew Grove HouseGrade II
- 104 m2, 3 and 4, Upper TerraceGrade II
- 104 mGarden Wall to Number 26 Old Grove HouseGrade II
- 105 mOld Grove House and Attached Outbuildings and RailingsGrade II
- 112 mThree Bollards Opposite Number 1 (Number 1 Not Included)Grade II
- 114 mCapo Di MonteGrade II
- 119 mFront Garden Walls, Railings, Piers, Gate and Mounting Block to Numbers 105-111Grade II
- 120 mTwo Lamp Posts on the South SideGrade II
- 123 m10 and 11, the Mount SquareGrade II
- 123 mFrognal Grove Including Former Stable RangeGrade II*
- 124 m4, 5 and 7, the Mount SquareGrade II
- 127 mCaroline HouseGrade II
- 128 m8 and 8a, the Mount SquareGrade II
- 130 m12-17, the Mount SquareGrade II
- 132 mHolly CottageGrade II
- 134 mLamp PostGrade II
- 136 m8 and 9, the MountGrade II
- 143 m113, 115 and 117, Heath StreetGrade II
- 144 mLamp PostGrade II
- 145 mNumbers 119 and 121 and Attached RailingsGrade II
- 147 m1, 2 and 3, the Mount SquareGrade II
- 148 mGarden Wall to Romneys HouseGrade II
- 150 m123, Heath StreetGrade II
Checked on 21 October 2026. The pin for this application is the centre of its postcode rather than the building, so distances to nearby designations are measured from the postcode and can be out by the width of the postcode area. Historic England, the Environment Agency, Natural England, Transport for London (public transport access levels, Powered by TfL Open Data, OGL v3.0, contains OS data © Crown copyright and database right 2025) and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.
Sales history 1
Last sold for £2,575,000 in January 2010. Detached house, freehold.
Sale prices from HM Land Registry's price paid record, matched to this application by its address.
Every application in Camden - and every UK council - as a live feed, an API, or a bulk CSV export.
Other new applications on this street
22 Windmill Hill London NW3 6RX
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REAR GARDEN: 1 x Quince (T1) - Reduce crown height by approx. 1.5m - 1.7m as is ...
Windmill Hill House Windmill Hill London NW3 6SJ
REAR GARDEN: 1 x Bay (T1) - Fell to ground level.
Fenton House Windmill Hill London NW3 6SP
FRONT GARDEN: 1 x Holly (Ilex aquifolium 'Variegata')- Fell to ground level.
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Important details
Decision outlook
Day 8 of the 56-day target. Camden usually decides demolitions by day 146.
Plota live figures for demolitions decided by Camden in the last twelve months, from validation. Camden decision record →
Consultation & key dates
- Comments by
- 13 Nov 2026
Historical activity at this location
26 previous applications on record - archival context, not part of the live application.
Previous applications at this address
Nearby activity
Camden is slower than most councils at deciding householder applications, ranking #242 out of 296. Householder applications are slightly less likely to be approved here (88%) than the national average (90%).
Sale prices: Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.
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21 Windmill Hill London NW3 6RX
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Comments are open until 13 Nov 2026