Sofia House 19 Conduit Street London W1S 2BH Data via plota.co.uk

26/02841/FULL - Full Planning Permission Application Approved

Proposal

Erection of five storey rear extension including extension of lower ground floor, roof level alterations including a new terrace, new dormers and extension to rear, installation of plant and alterations to the shopfront. Data via plota.co.uk

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View original council record ↗Last checked 24 Aug 2026, 09:20

Application progress

✓

Received

29 Apr 2026

✓

Consultation

11 May 2026

✓

Approved

31 Jul 2026

Approved on 31 Jul 2026 · Delegated Decision · Last checked 4 Aug 2026

Documents 80

Decision & officer reports 2

PDF GRANT OF FULL PP [PE] Decision Notice · 31 Jul 2026 View ↗ PDF DELEGATED REPORT Report · 31 Jul 2026 View ↗

Statements & assessments 11

Plans & drawings 33

Application forms 1

PDF APPLICATIONFORMREDACTED Application Form · 29 Apr 2026 View ↗

Consultation & comments 4

PDF THAMES WATER COMMENT Consultee Comment · 4 Jun 2026 View ↗ PDF HISTORIC ENGLAND Consultee Comment · 18 May 2026 View ↗ PDF CNSLT-CONSULTEE CLOUD STD Background Papers · 11 May 2026 View ↗ PDF NEIGHBOUR NOTIFICATION LETTER (21D) Background Papers · 11 May 2026 View ↗

Associated applications 2

FullApproved31 Jul 202626/02841/FULLThis application
Erection of five storey rear extension including extension of lower ground floor, roof level alterations including a new…
Conditions 12 awaiting decision
- ConditionsDetails of the pre-demolition audit in accordance with section 4.6 of the GLA's adopted…19 Aug 202626/05695/ADFULL

Site constraints 8

Grade II listed: 20, Conduit Street W1

List entry 1066974 · 7 m from the pin · 38 more listed buildings within 150 m (1 Grade I, 3 Grade II*, 34 Grade II)

Listed building consent is needed for work that affects the special interest of a listed building, inside or out, on top of planning permission. Setting can be a consideration for buildings nearby; there is no fixed radius.

Show the other 38 with distances

31 m32 St George StreetGrade II
42 m30 St George StreetGrade II
45 m48, Conduit Street W1Grade II
46 m47, Conduit Street W1Grade II
48 m46, Conduit Street W1Grade II
52 m42 and 43, Conduit Street W1Grade II
55 mChurch of St George, Vestry and ObelisksGrade I
62 m6 and 7 St George StreetGrade II
62 m4 St George StreetGrade II
64 m3 St George StreetGrade II
67 m8 to 10 St George StreetGrade II
79 m9, Conduit Street W1Grade II*
102 m12a and 12b St George Street and 46a Maddox StreetGrade II
108 m13 St George StreetGrade II
108 m47, Maddox Street, including workshops to rearGrade II
108 mSotheby'sGrade II
110 m36, New Bond Street W1Grade II
110 m22 and 23, Old Burlington Street W1Grade II
112 m26, New Bond Street W1Grade II
113 m49, Maddox Street W1Grade II
114 m14 St George StreetGrade II
119 m39-42, New Bond StreetGrade II
124 m15 St George StreetGrade II*
126 m4, Clifford Street W1Grade II
127 m5, Clifford Street W1Grade II
131 mTriumph HouseGrade II
132 m8, Clifford Street W1Grade II*
138 m144-146 New Bond Street (Formerly Colnaghi)Grade II
138 m1 and 2, New Burlington Street W1Grade II
139 m143, New Bond Street W1Grade II
139 m9, Clifford Street W1Grade II
140 m16 and 17, St George StreetGrade II
141 m140, New Bond Street W1Grade II
145 mThe Fine Art SocietyGrade II
145 m4, Pollen Street W1Grade II
145 m203-221, Regent Street W1Grade II
146 m47 and 48, New Bond Street W1Grade II
148 m135-137, New Bond Street W1Grade II

Historic England ↗

Mayfair conservation area

Demolition needs planning permission and permitted development is restricted.

The council must give weight to preserving or enhancing the area's character and appearance. Not every council has published its boundaries as open data.

Council document ↗

2 Article 4 directions

Article 4 Basement Development Permitted Rights Removed · Article 4 Direction Class E To C3 In Central Activities Zone. Named permitted development rights are withdrawn here.

An Article 4 direction withdraws particular permitted development rights, so work that would normally need no application needs one here. Not every council has published its directions.

Archaeological priority area: City of Westminster APA 2.5

An assessment or field evaluation may be asked for before ground works.

The council or Historic England considers archaeology likely here. A desk-based assessment, and sometimes trial trenching, can be asked for with the application.

Air quality management area: Westminster AQMA

The council has declared the area as failing an air quality objective.

Schemes that add traffic, parking or combustion plant are assessed against the area's action plan and may need an air quality assessment.

Council record ↗

Town centre: West End

A designated centre in the London Plan.

Shops, services and active frontages are protected in centres, and main town centre uses are steered here first.

Central activities zone

The core of central London in the London Plan.

Offices, culture and the other strategic functions of the centre take priority over new housing here.

Also on the record

Inside the City of Westminster built-up area.

Not affected

Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 11 September 2026. Historic England, the Environment Agency, Natural England 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.

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Important details

Council: Westminster
Application type: Full Planning Permission Application
Postcode: W1S 2BH
Received: 29 Apr 2026
Validated: 29 Apr 2026
Ward: West End
Case officer: Show
Target decision: 24 Jun 2026
Decision: Application Permitted
Decision date: 31 Jul 2026
Decision level: Delegated Decision
Agent: Jones Lang LaSalle Limited

How this decision compares

Decided in 93 days from validation, 36 days slower than Westminster's median of 57 for commercial premises. Approved, as 89% of commercial premises here are.

This one93d

Council57d

UK56d

48%decided within 8 weeks

89%approved

241decided in the last year

Plota live figures for commercial premises decided by Westminster in the last twelve months, from validation. Westminster decision record →

Public comments

1comment received

1 neutral

97 neighbours consulted · Last counted 4 Aug 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference: PP-14882848
Site or press notice: 11 May 2026
Env. assessment: No

Historical activity at this location

26 previous applications on record - archival context, not part of the live application.

This property

Previous applications at this address

2016 Approved

Amendments to planning permission dated 2 September 2015 (RN: 15/06246/FULL) for the inst…

16/04280/NMA 25 May 2016

Within ~100m

Nearby activity

2025 Approved

20 Conduit Street London W1S 2XW

Installation of replacement ground floor primary office entrance door; Retention of fanli…

25/06305/LBC 28 Oct 2025

2025 Approved

20 Conduit Street London W1S 2XW

Installation of replacement ground floor primary office entrance door; Retention of fanli…

25/06304/FULL 28 Oct 2025

2025

Washington House 40 - 41 Conduit Street London W1S 2YQ

Use of basement and part ground floor as dual alternative restaurant or retail (Class E)…

25/07055/FULL 1 Oct 2025

2025

38 Maddox Street London W1S 1PY

Display of externally illuminated hanging sign measuirng 0.9m X 1.35m, externally illumin…

25/06924/ADV 26 Sep 2025

2025 Approved

31 - 33 Maddox Street London

Installation of new rooflight windows at 5th floor side (south) elevation.

25/04528/FULL 10 Sep 2025

2025

26 - 27 Conduit Street London W1S 2XX

Reinstatement of four windows at fifth floor level on the Conduit Street elevation.

25/06184/FULL 1 Sep 2025

2025

4 Mill Street London W1S 2AX

Erection of a rear roof extension at third floor level with a sedum roof to the rear; rep…

25/05998/FULL 22 Aug 2025

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Basement And Ground Floor And Mezzanine 45 Conduit Street London W1S 2YN

Display for a temporary period of six months of a non-illuminated estate agent board loca…

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20 Conduit Street London W1S 2XW

Rear extension of an existing fifth floor plant room converted into office space (E use)…

25/02292/LBC 3 Apr 2025

2025

20 Conduit Street London W1S 2XW

Rear extension of an existing fifth floor plant room converted into office space (E use)…

25/02291/FULL 3 Apr 2025

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25 - 27 St George Street London W1S 1FS

Alterations to the elevations on St. George St and Masons Arms Mews; removal of the car l…

25/01410/FULL 3 Mar 2025

2025

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25/00788/ADV 5 Feb 2025

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Variation of condition 1 of planning permission dated 27th March 2024 (RN:23/07891/FULL)…

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24/05312/LBC 3 Aug 2024

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Basement To First Floor Savile House 14 Coach And Horses Yard London W1S 2EJ

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Internal alterations to window privacy blinds including replacement and upgrade of existi…

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Westminster

Planning Authority Score

3.5/10

Below average

#221 of 296 councils

Relevant to this application:

Householder decisions

Westminster is slower than most councils at deciding householder applications, ranking #258 out of 296. Only 28% of applications have the time limit extended, well below the 41% national average - the council usually decides on time. Westminster is also one of the strictest councils - it refuses more householder applications than almost any other, with only 81% approved vs 90% nationally.

One of the strictest councils

only 81% approved vs 90% nationally

These figures are council-wide context, not a prediction for this application. View full council performance

Westminster decision statistics

Based on MHCLG data, the year to March 2026

86%

Overall approval rate

Below avg (87%) #201 of 296

81%

Householder approved

Below avg (90%) #277 of 296

44%

Decided in 8 weeks

Below avg (63%) #258 of 296

28%

Extended time limit

Below avg (41%) #46 of 296

83%

Minor dwellings approved

12 decided (1-9 homes)

67%

Major dwellings approved

3 decided (10+ homes)

81%

Change of use approved

133 decided

4,602

Total decisions

648 refused in the year to March 2026

Sofia House 19 Conduit Street London W1S 2BH Data via plota.co.uk

Proposal

Application progress

Documents 80

Decision & officer reports 2

Statements & assessments 11

Plans & drawings 33

Application forms 1

Consultation & comments 4

Other documents 29

Associated applications 2

Site constraints 8

Other new applications on this street

Nearby new applications

Important details

How this decision compares

Public comments

Consultation & key dates

Previous applications at this address

Nearby activity