Extensions to a single dwelling | Building Control fees | Sevenoaks District Council
Website maintenance

From 9pm on Monday 31 March, some of our online payments, forms & features will be unavailable while we carry out maintenance. This will be for a maximum of 4 hours. We apologise for the inconvenience

Building Control fees

Extensions to a single dwelling

Fees up to and including 31 March 2025

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

£173.88

£434.70

£608.58

£760.73

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

  1. 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%.
  2. 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.

 

Fees from 1 April 2025

Extensions and conversions

Limited to work not more than three storeys above ground level.

Fees include VAT where applicable. Regularisation applications are not subject to VAT.

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

£173.88

£434.70

£608.58

£760.73

D02

Single storey extension with a with floor area between 10m² and 40m²

£260.82

£607.03

£867.85

£1,084.82

D03

Single storey extension with floor area between 40m² and 100m²

£347.76

£693.97

£1,041.70

£1,302.17

D04

Multi-storey extension (i.e. some part 2 or 3 storeys in height) and floor area not exceeding 40m²

£347.76

£693.97

£1,041.70

£1,302.17

D05

Multi-storey extension (i.e. some part 2 or 3 storeys in height) and floor area 40m² to 100m²

£347.76

£780.91

£1,128.70

£1,410.84

D20 Multi-storey extension (ie some part 2 or 3 storeys in height) & floor area 100m² to 150m² £434.70 £961 £1,395.70 £1,744.62

D06

Extension comprising solely a garage, carport or store with a floor area less than 60m²

£173.88

£434.70

£608.58

£760.73

D07

Detached non-habitable domestic building with a floor area less than 60m²

£173.88

£434.70

£608.58

£760.73

D07A Detached habitable domestic building with a floor area less than 60m² £301.19 £600.82 £902 £1,127.51

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

£347.76

£693.97

£1,041.70

£1,302.17

D09

Loft conversions with a floor area between 40m² & 100m²

£358.10

£780.91

£1,139

£1,423.77

D10

Conversion of a garage to a habitable room

£173.88

£321.37

£495.25

£619.07

Figures include VAT

Multiple work reductions

  1. 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%.
  2. 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.