Community Infrastructure Levy in Harrow
Residential CIL in Harrow is charged per m² of new gross internal area under the council's charging schedule (effective 2013-10-01). Mayoral CIL 2 Band 2 (£72.73/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 |
|---|---|---|---|
| Borough-wideResidential (Use Class C3); index 224 (2013) -> 400 (2026)Source: Harrow charging schedule · verified 2026-09-18 | £110.00 | £196.43 (2026) | £196.43/m² |
Source: charging schedule · council CIL page · verified 2026-09-18. Charging Schedule approved 4 Jul 2013, effective 1 Oct 2013; single borough-wide residential rate, no zones/map. Other rates: C1 hotels/C2/student/hostels/HMOs £55 (2026: £98.21); A1-A5 retail £100 (2026: £178.57); all other nil. Annual CIL Rate Summary 2026: https://www.harrow.gov.uk/downloads/file/33820/harrow-annual-cil-rate-summary-2026. Instalments policy (in schedule): <£100k no instalments (60 days); £100k-£250k two instalments (£100k at 60 days, balance 120 days); £250k-£500k three (60/120/180 days); >£500k four (60/120/180/240 days). 5% admin retained.
| Scheme | Liability | Exemption | At stake if filed wrong |
|---|---|---|---|
| Rear extension, 120 m², owner-occupier | £32,299 | Form 9 | £32,299 |
| Garden annex, 60 m², for a relative | £16,150 | Form 8 | £16,150 |
| New self-build house, 180 m² | £48,449 | Form 7 | £48,449 |
| Small developer, 3 flats, 240 m² (no exemption) | £64,598 | none | £64,598 |
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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