Improving on Droop Street

What you could build on Droop Street: the planning rules at this address, what neighbours have built and how big, planning decisions nearby, rough costs and the value an extension adds, and how to get started. In Queen's Park Gardens, Westminster.

Postcodes on Droop Street

Checks tied to a spot (flood, radon, ground, noise, distances) are measured at W10 4EQ, where most of the street's homes are. A long street can differ from end to end: open a postcode for its own improving page.

W10 4EQ · 11 homes W10 4EJ · 10 homes W10 4DQ · 8 homes W10 4DD · 5 homes W10 4EH · 3 homes W10 4EL · 2 homes W10 4DA · 1 home W10 4DH · 1 home

146extensions seen within 600 m in the last 10 years

9loft conversions within 600 m in the last 10 years

79%of 28 householder applications nearby approved (since 2023)

170.4extensions per 1,000 homes in the neighbourhood (10 years)

● work seen on energy certificates · ● application approved · ● refused · ● pending or other · ● this postcode

The rules at this address

Mostly flats at this postcode. Flats have no permitted development rights, so almost any extension or loft conversion needs planning permission, and the freeholder's consent under the lease.
Not in a conservation area (from council registers).
Article 4 direction (Article 4 Basement Development Permitted Rights Removed): some rights normally allowed have been removed here. Check what it covers with the council before relying on permitted development.
Listed buildings need listed building consent for most changes, inside and out: check the National Heritage List.
To be certain work is permitted development, apply for a lawful development certificate (about £129 for householders in England). Building regulations apply either way.

What neighbours have built

Home	Work	Seen	Space added	Floor area	Rooms	Distance
25, Enbrook Street	Extension	2026	+23 m²	80 m² → 103 m²	–	62 m
19, Galton Street	Extension	2026	+22 m²	88 m² → 110 m²	4 → 4	134 m
32, Galton Street	Extension	2026	+12 m²	87 m² → 99 m²	5 → 5	169 m
22, Alperton Street	Extension	2026	+8 m²	90 m² → 98 m²	6 → 4	204 m
74, Kilravock Street	Extension	2026	+28 m²	75 m² → 103 m²	3 → 4	266 m
16, Lothrop Street	Extension	2026	+18 m²	60 m² → 78 m²	4 → 4	278 m

Planning applications nearby

Address	Work	Outcome	Decided	Drawings and agent
141, 141 Second Floor Flat, Portnall Road, W9 3bn	Loft or dormer	Under consideration	–	26/06726/FULL
226, Kilburn Lane, W10 4ba	Other householder work	Under consideration	–	26/05424/P3JPA
31, Fermoy Road, W9 3nh	Loft or dormer	Refused	Mar 2026	25/08251/CLOPUD
39, Fermoy Road, W9 3nh	Loft or dormer	Refused	Mar 2026	25/08252/CLOPUD
1 Alderson Street, London, W10 5jy

How often householder applications are approved

Work	Queen's Park Gardens	Westminster	London	Typical decision time
All householder applications	92% (13)	83% (174)	80%	8 weeks
Loft or dormer	–	83% (18)	81%	10 weeks
Rear extension	–	73% (11)	79%	10 weeks
Two-storey extension	–	–	72%	8 weeks
Other householder work	86% (7)	84% (102)	70%	8 weeks
Side return or wrap-around	–	–	88%	8 weeks
Windows, doors or cladding	–	90% (20)	90%	6 weeks
Outbuilding or garden room	–	–	79%	8 weeks
Side extension	–	–	86%	8 weeks
Garage conversion or garage	–

Cost and the value it adds

Across England and Wales, homes extended by a typical 30 m² and then resold rose about 11.1% more than similar homes nearby over the same years (124,884 resales). How extensions pay off by size, type and region.

Single-storey rear or side extension: about £2,000–£3,000 per m² (London £2,500–£4,000), plus fees and VAT
Loft conversion: about £45,000–£75,000 for a dormer; more for a mansard or hip-to-gable
Two-storey extension: about £1,800–£2,800 per m² of new floor
Garage conversion: about £15,000–£30,000
Basement: about £3,500–£5,000 per m², London mostly

Build costs are rough 2026 ranges from industry guides, not quotes. Get three quotes for your plans.

Move or improve?

The money you don't get back either way, for the same extra space in Queen's Park Gardens.

Your home is worthExtra space you need (m²)Homes here sell for, per m²Building cost per m²Share of that an extension adds (%)

Move to a home 20 m² bigger (about £1,138,000)

Stamp duty on the new home	£57,550
Estate agent on yours 1.2% + VAT	£13,248
Solicitors, buying and selling	£3,000
Survey	£600
Removals	£1,500
Money gone	£75,898

Extend by 20 m²

Building, plus 15% for design, planning and contingency	£57,500
Less what it adds to your home's value 60% of the local price	−£130,800
Money gone	−£73,300

On these figures, extending loses about £149,198 less. Moving also changes the area, the schools and the commute; extending means months of building work and depends on planning.

Building costs vary a lot (a single-storey rear extension is often £2,000–£3,000 per m², more in London). How much space adds depends on the home and street: what extensions added to resale prices. A guide, not advice; nothing you type leaves this page.

Getting started

Look at what neighbours did. Open applications above to see drawings that were approved on similar houses, and who designed them.
Check the route: permitted development (with a lawful development certificate), prior approval for larger rear extensions, or full householder planning permission.
Get a measured survey and a designer: an architect, an architectural technologist or a designer who handles planning drawings.
Apply (householder permission is about £258 in England; councils aim to decide within 8 weeks).
Building regulations through the council's building control or an approved inspector, and party wall notices to neighbours if you build on or near the boundary.
Choose a builder: written quotes, a contract, staged payments, and check their insurance and references.

Find help: RIBA Find an Architect ↗ · CIAT architectural technologists ↗ · TrustMark tradespeople ↗ · Federation of Master Builders ↗ · Planning Portal guides ↗

General guidance, not planning or legal advice. Fees and rules as checked in October 2026; confirm with the council.

Energy certificates: MHCLG (OGL). Planning applications: GLA Planning London Datahub. Conservation areas and Article 4: planning.data.gov.uk (OGL).

Go deeper

Looking along the street…