Estiquote

Local costs · South East · September 2026

How much does an extension cost in Folkestone and Hythe?

A mid-range 25 m² single-storey extension in Folkestone and Hythe costs about £72,500 to £89,500 including VAT, or £2,900 to £3,600 per m² at South East prices. Folkestone and Hythe charges £942 for building control on a 10 to 40 m² extension (full plans, including VAT): 12% above the typical council (£840). With design, a structural engineer, building control and a 15% contingency, budget £89,500 to £115,000.

By Estiquote · Prices reviewed · Council fees from Folkestone and Hythe's published schedule · How we calculate

Work out your project in Folkestone and Hythe

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Typical prices in Folkestone and Hythe

Mid-range finish, South East prices, including VAT. The budget adds design and engineering fees, Folkestone and Hythe's building control charge and a 15% contingency.
ProjectBuilding workBudget to plan for
Single-storey extension, 25 m²£72,500 to £89,500£89,500 to £115,000
Double-storey extension, 40 m²£105,000 to £132,000£128,000 to £167,000
Dormer loft conversion, 30 m²£65,000 to £80,000£80,000 to £102,000
Kitchen, medium£9,700 to £17,200£11,100 to £19,800
Bathroom refit£6,500 to £9,800£7,500 to £11,300

Building prices in South East run about 15% above the UK average outside London. Kitchens and bathrooms vary less from place to place than extensions and lofts.

Building control fees in Folkestone and Hythe

Folkestone and Hythe council charges including VAT (plan and inspection combined)
WorkCharge
Extension up to 10 m² (full plans)£753
Extension 10 to 40 m² (full plans)£942
Larger extension, 40-100 m² (full plans)£1,130
Extension 10 to 40 m² (building notice)Not published
Loft conversion up to 40 m²£942
Garage conversion£471

Folkestone and Hythe charges £942 for building control on a 10 to 40 m² extension (full plans, including VAT): 12% above the typical council (£840). Source: Folkestone and Hythe's building control charges, Not stated (page dated 28 March 2025). Inc VAT column.

Private approved inspectors set their own prices and are often competitive, so it is worth asking one or two for a quote as well. See how Folkestone and Hythe compares with every council we checked.

Notes on Folkestone and Hythe's schedule

Own page (full plans submission charges). Lofts share the extension rows. Building-notice figures not captured.

Planning

If your extension needs planning permission, a householder application in England costs £548. Many single-storey rear extensions are permitted development and need no application, and a lawful development certificate (£274) confirms it.

Other councils in South East

Building control for a 10 to 40 m² extension:

Questions people ask

How much does an extension cost in Folkestone and Hythe?

A mid-range 25 m² single-storey extension in Folkestone and Hythe costs about £72,500 to £89,500 including VAT for the building work, or £2,900 to £3,600 per m², based on South East prices reviewed in September 2026. With fees and a 15% contingency, budget £89,500 to £115,000.

How much is building control in Folkestone and Hythe?

Folkestone and Hythe charges £942 (including VAT) for a 10 to 40 m² extension (full plans), according to its published schedule (Not stated (page dated 28 March 2025)).

How much does a loft conversion cost in Folkestone and Hythe?

A mid-range 30 m² dormer loft conversion in Folkestone and Hythe costs about £65,000 to £80,000 including VAT for the building work, and about £80,000 to £102,000 with fees and a 15% contingency.

Before you get quotes