REF · SL-10023198745 · RETRIEVED 19 Apr 2026, 13:02

CONSTRAINTS · HIGHPRECEDENT · HIGHUPLIFT · MEDIUM

PROPERTY · UPRN 10023198745

42 Pond Street

Hampstead · NW3 2PN · London Borough of Camden

TYPE · Terraced · MidEPC · D · 62TENURE · FreeholdCOUNCIL TAX · Band F

Likely route

Full planning required — not PD.

Property sits inside Hampstead Conservation Area (Sub-Area 3). Permitted development rights are modified. Recent approvals on this street suggest a 3m single-storey rear in matching stock brick is within policy.

Conservation AreaArticle 4 (partial)Not listedParty wall · both sides

Subject property

Coordinates · 51.5556, -0.1655

Planning designations6 checked

Conservation Area Hampstead (Sub-Area 3)planning.data.gov.uk · highApplies

Article 4 Direction HMO & shopfront onlyplanning.data.gov.uk · highPartial

Listed Building Grade II within 50mHistoric England · highNot listed

TPO zones within 30mCamden TPO register · low3 present

Flood risk EA zoneEnvironment Agency · highZone 1 · low

CPZ Controlled Parking ZoneCamden · mediumCA-G

Uplift estimate · Land RegistryConfidence: medium

Current valuation 2026 est.£1,845,000

With 3m rear + side return +18 sqm+ £246,000

With mansard loft +24 sqm+ £318,000

Street-level range 5yr £/sqm delta£13.6k–£15.8k / sqm (5yr)

What you can build

Demo address · real PD engine · House

Route cards use the same permitted-development screen as the live free check. The address and designations above are illustrative; the verdict logic is not.

Rear extension

VERIFY

A single-storey rear extension may still be permitted development — but not the larger route.

Rear extension guide →

Side return extension

PERMISSION REQUIRED

A side return extension here needs planning permission.

Side return extension guide →

Loft conversion

PERMISSION REQUIRED

A loft conversion here needs planning permission.

Loft conversion guide →

Basement extension

PERMISSION REQUIRED

A basement needs planning permission.

Basement extension guide →

Garden room

VERIFY

A garden room at the rear may still be permitted development.

Garden room guide →

Build-cost estimate

Indicative range · not a quotation

Rear extensionConfidence: Medium

Low

£45,000

Expected

£57,000

High

£69,000

≈ 15 sqm · £3,800/sqm expected (£3,000–£4,600)

Main drivers

Conservation-area specification (matching stock brick, lime mortar, bespoke glazing).Restricted rear access — materials through the house or over a neighbour's land.Full-width structural glazing and the steel to support it.Party wall awards and drainage build-over agreements.Conservation areaArticle 4 direction matched

Side return extensionConfidence: Medium

Low

£38,000

Expected

£48,000

High

£58,000

≈ 12 sqm · £4,000/sqm expected (£3,200–£4,800)

Main drivers

Steel transfer and structural opening through the original rear wallParty wall on the infill boundaryRoof glazing along the returnConservation areaArticle 4 direction matched

Loft conversionConfidence: Medium

Low

£72,000

Expected

£89,000

High

£108,000

≈ 24 sqm · £3,700/sqm expected (£3,000–£4,500)

Main drivers

Mansard or conservation specification (natural slate, lead detailing).Fire-escape upgrades and the new protected stair.Steel sizes and party wall awards on both sides.Relocating water tanks/services in the roof.Conservation areaArticle 4 direction matched

BasementConfidence: Low

Low

£258,000

Expected

£366,000

High

£516,000

≈ 43 sqm · £8,500/sqm expected (£6,000–£12,000)

Main drivers

Ground conditions and the water table (waterproofing and pumping).Listed/conservation context and method-statement requirements.Party wall awards on every boundary.Depth, lightwells and structural complexity.Conservation areaArticle 4 direction matched

Garden roomConfidence: Medium

Low

£29,000

Expected

£39,000

High

£49,000

≈ 13 sqm · £3,000/sqm expected (£2,200–£3,800)

Main drivers

Foundations and ground conditions.Power, data and (if plumbed) drainage runs across the garden.Specification — glazing, cladding and finishes.Whether it needs Building Regulations (size/use).Conservation areaArticle 4 direction matched

Indicative ranges from the same calibrated tables as the live check and paid report — not quotations.

Request feasibility review

Get a human read on 42 Pond Street, NW3 2PN

For a serious project, get a professional read on feasibility and consent — reviewed by a RICS-regulated chartered surveyor (Hampstead Chartered Surveyors, Firm Reg. 923064). No obligation.

Recent sales · this postcode

Real · HM Land Registry

Transactions

Median

£750,000

Range

£40,000–£7,900,000

Period

2006–2025

2025-10-23POND COURT, 23, POND STREET, LONDON other · Freehold£3,300,000

2025-10-163, POND STREET, LONDON semi-detached · Freehold£7,900,000

2025-09-0431, POND STREET, LONDON terraced · Freehold£4,850,000

2021-12-1519, POND STREET, LONDON flat-maisonette · Leasehold£315,000

2021-06-2921, POND STREET, LONDON flat-maisonette · Leasehold£643,000

2021-04-067, POND STREET, LONDON flat-maisonette · Leasehold£562,500

2019-02-059, POND STREET, LONDON other · Freehold£1,000,000

2019-02-057, POND STREET, LONDON other · Freehold£1,000,000

Source: HM Land Registry Price Paid Data. Open Government Licence. Sold prices only — no floor area, so not £/sqm.

Planning Permission Checker provides planning and cost intelligence for early feasibility only. It is not legal, planning, valuation, architectural, structural, or surveying advice. All estimates are indicative and must be verified by qualified professionals before purchase, design, planning submission, or construction.

Cost estimates are indicative only — not a quotation. Final price depends on survey, specification, structure, access, party wall matters, VAT, professional fees, and contractor availability.

Planning outcomes are not guaranteed. Local planning authorities make final decisions.

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