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Building Control fees

Extensions to a single dwelling

Extensions and conversions

Limited to work not more than three storeys above ground level

Code	Extensions	Full Plans application fee	Full Plans inspection fee	Building Notice fee	Regularisation fee
D01	Single storey extension with a floor area less than 10m²	£168	£420	£586.50	£734
D02	Single storey extension with a with floor area between 10m² and 40m²	£252	£586	£838.50	£1,049
D03	Single storey extension with floor area between 40m² and 100m²	£336	£670.50	£1,006.50	£1,258
D04	Multi-storey extension (i.e. some part 2 or 3 storeys in height) and floor area not exceeding 40m²	£336	£670.50	£1,006.50	£1,258
D05	Multi-storey extension (i.e. some part 2 or 3 storeys in height) and floor area 40m² to 100m²	£336	£754.50	£1,090.50	£1,363
D20	Multi-storey extension (ie some part 2 or 3 storeys in height) & floor area 100m² to 150m²	£420	£928.50	£1,348.50	£1,686
D06	Extension comprising solely a garage, carport or store with a floor area less than 60m²	£168	£420	£586	£734
D07	Detached non-habitable domestic building with a floor area less than 60m²	£168	£420	£586	£734
D07A	Detached habitable domestic building with a floor area less than 60m²	£291	£580	£870	£1,089

Conversions

Code	Conversions	Full Plans application fee	Full Plans inspection fee	Building Notice fee	Regularisation fee
D08	Loft conversions with a floor area less than 40m²	£336	£670.50	£1,006.50	£1,258.50
D09	Loft conversions with a floor area between 40m² & 100m²	£346	£754.50	£1,090.50	£1,362
D10	Conversion of a garage to a habitable room	£168	£310.50	£478.50	£597

Figures include VAT

Multiple work reductions

Where more than one extension, or an extension and a loft conversion is proposed and the works are carried out concurrently, the individual fees should be combined and reduced by 30%.
Where domestic alterations up to £15,000 are to be carried out at the same time as work described in codes D01 – D09 above, the charge payable in Table C can be reduced by 30%.

Where Standard Charges are not applicable, please email building.control@sevenoaks.gov.uk, or telephone 01732 227376.