Mount Harry House Ditchling Road Offham East Sussex BN7 3QW Data via plota.co.uk

Proposal

Extension of existing gym and cottage/outbuilding. Also proposed is a stand alone sauna and external plant room. Data via plota.co.uk

View original council record ↗Last checked

Application progress

✓
Received
7 May 2026
✓
Validated
18 May 2026
✓
Approved
13 Jul 2026

Approved on 13 Jul 2026 · SDNPA Delegated Decision · Last checked 2 Oct 2026

Site constraints 7

South Downs National Park
The park authority decides applications here. Great weight to conserving the landscape; major development restricted.
Landscape, scenic beauty and wildlife carry great weight, and major development is only allowed in exceptional circumstances.
Agricultural land, grade 3a
Best and most versatile land (grades 1, 2 and 3a). Source: the Predictive Agricultural Land Classification Map (Defra and Natural England, 2025; the Welsh Government's Predictive ALC Map 2 in Wales), a model rather than a site survey. Natural England's Provisional ALC map (1:250,000, 1970s) agrees.
Where development of farmland is needed, policy prefers poorer land over the best and most versatile (grades 1, 2 and 3a). Three sources: Natural England's post-1988 field surveys, which are definitive where they exist; the Defra predictive map for England (2025) and the Welsh Government predictive map, modelled from the soil map with 3a and 3b split; and the 1970s provisional map, which planners and other services still show, coarser and with grade 3 undivided. Where the provisional and predicted grades disagree, treat the predicted grade as the current estimate and expect an application to carry its own survey.
Habitat network: Network Enhancement Zone 2
Where habitat is joined up enough to work as a network. Context, not a constraint on its own.
Also on the record
Radon affected area, class 3; Nature improvement area: South Downs Way Ahead; SSSI 373 m away: Clayton to Offham Escarpment SSSI; Priority habitat 28 m away: Deciduous woodland.
Not affected
Outside flood zones 2 and 3 · Not green belt · No listed building at the site

Checked on 6 October 2026. Historic England, the Environment Agency, Natural England, the British Geological Survey and UK Health Security Agency (radon, contains BGS materials © UKRI) 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.

Building

Floor area965 m² (10,387 sq ft)
Energy ratingC (72 out of 100)
PropertyDetached house, 27 habitable rooms
BuiltBefore 1900
HeatingBoiler and underfloor heating, mains gas
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in December 2022, the latest held for this property. The building may have changed since. View the certificate

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Important details

Application type
Householder
Postcode
BN7 3QW
Received
7 May 2026
Validated
18 May 2026
Ward
Plumpton Streat E.Chiltington St John W
Parish
St. John (Without) Parish
Case officer
Show
Target decision
13 Jul 2026
Decision
Approved
Decision date
13 Jul 2026
Decision level
SDNPA Delegated Decision
Applicant
Show
Agent
Melanie Whittington Architects

How this decision compares

Decided in 56 days from validation, about the council's usual 57 days. Approved, as 92% of extensions here are.

50%decided within 8 weeks
92%approved
696decided in the last year

Plota live figures for extensions decided by South Downs in the last twelve months, from validation. South Downs decision record →

Public comments

No public comments yet.

2 neighbours consulted · Last counted 2 Oct 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-14910966
Planning Portal ref
PP-14910966
Statutory expiry
13 Jul 2026
Env. assessment
No

Energy performance: Energy performance certificates from the Energy Performance of Buildings Register, Ministry of Housing, Communities and Local Government. Contains public sector information licensed under the Open Government Licence v3.0. © Crown copyright 2026.