Community Infrastructure Levy in Westminster
Residential CIL in Westminster is charged per m² of new gross internal area under the council's charging schedule (effective 2016-05-01). Mayoral CIL 2 Band 1 (£96.97/m²) is charged on top by the Greater London Authority. Extensions under 100 m² that create no new dwelling are not liable (reg 42); owner-occupiers can claim the self-build, annex or extension exemption — but only before work starts.
| Zone | Adopted rate | Indexed rate | Applied |
|---|---|---|---|
| PrimeResidential (including all residential 'C' use classes); Ic=271 (2016), Iy(2026)=400Source: Westminster charging schedule · verified 2026-09-18 | £550.00 | £811.80 (2026) | £811.80/m² |
| CoreIc=271, Iy=400Source: Westminster charging schedule · verified 2026-09-18 | £400.00 | £590.40 (2026) | £590.40/m² |
| FringeIc=271, Iy=400Source: Westminster charging schedule · verified 2026-09-18 | £200.00 | £295.20 (2026) | £295.20/m² |
Source: charging schedule · council CIL page · zone map · verified 2026-09-18. Westminster CIL Charging Schedule approved 20 Jan 2016, effective 1 May 2016. Three zones (Prime/Core/Fringe) mapped in Appendix 1 of the schedule PDF; separate zone maps exist per land use. Commercial (offices, hotels, nightclubs/casinos, retail) £200/£150/£50; all other uses nil. 2026 indexed rates from Annual CIL rate summary 2026: https://www.westminster.gov.uk/sites/default/files/media/documents/annual-cil-rate-summary-2026.pdf (2025: £793.54/£577.12/£288.56). Charging schedule also at https://www.westminster.gov.uk/sites/default/files/media/documents/CIL%20charging%20schedule_1.pdf (not fetched). Council CIL calculator: https://pfm.exacom.co.uk/westminster/calccil.php. Instalment policy not stated on fetched pages. Mayoral CIL Band 1 on top.
| Scheme | Liability | Exemption | At stake if filed wrong |
|---|---|---|---|
| Rear extension, 120 m², owner-occupier | £47,060 – £109,052 | Form 9 | £109,052 |
| Garden annex, 60 m², for a relative | £23,530 – £54,526 | Form 8 | £54,526 |
| New self-build house, 180 m² | £70,591 – £163,579 | Form 7 | £163,579 |
| Small developer, 3 flats, 240 m² (no exemption) | £94,121 – £218,105 | none | £218,105 |
Indicative — the council's Liability Notice is definitive. Under 100 m² and no new dwelling is not liable at all (reg 42).
Free liability range and exemption check. The £29 report gives the filing order for Forms 1, 2, 6 and 7/8/9 with dates and the surcharge at each step.
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