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Local costs · South East · September 2026

How much does an extension cost in Waverley?

A mid-range 25 m² single-storey extension in Waverley costs about £73,000 to £89,500 including VAT, or £2,900 to £3,600 per m² at South East prices. Waverley’s own published charge for building control on a 10 to 40 m² extension is £1,280 (full plans, including VAT): the 5th dearest of the 91 councils we checked, 52% above the typical council (£840). With a measured survey, building regulations drawings, a structural engineer, Waverley’s own building control charge and a 15% contingency, plan for £89,500 to £113,000.

By Estiquote · Prices reviewed · Council fees from Waverley’s published schedule · How we calculate · Updated

Work out your project in Waverley

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Typical prices in Waverley

Mid-range finish, South East prices, including VAT. For the extensions and the loft, the budget to plan for adds a measured survey, design and engineering fees, Waverley’s own building control charge and a 15% contingency; for the kitchen and bathroom, a 15% contingency.
ProjectBuilding workBudget to plan for
Single-storey extension, 25 m²£73,000 to £89,500£89,500 to £113,000
Double-storey extension, 40 m²£105,000 to £132,000£127,000 to £164,000
Dormer loft conversion, 30 m²£54,000 to £66,500£67,000 to £86,500
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 the 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 Waverley

Waverley’s own charges, including VAT (plan and inspection combined)
WorkCharge
Extension up to 10 m² (full plans)£800
Extension 10 to 40 m² (full plans)£1,280
Larger extension, 41 to 100 m² (full plans)£1,610
Extension 10 to 40 m² (building notice)£1,280
Loft conversion up to 40 m²£1,385
Garage conversion£640

Waverley’s own published charge for building control on a 10 to 40 m² extension is £1,280 (full plans, including VAT): the 5th dearest of the 91 councils we checked, 52% above the typical council (£840). Source: Waverley’s building control charges. The charges apply from 1 April 2026. The charges include VAT.

Private building control firms (registered building control approvers) set their own prices and are often competitive, so it is worth asking one or two for a quote as well. See how Waverley compares with every council we checked.

Notes on Waverley’s schedule

Waverley publishes its own schedule.

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 in writing.

Other councils in the South East

Building control for a 10 to 40 m² extension:

Questions people ask

How much does an extension cost in Waverley?

A mid-range 25 m² single-storey extension in Waverley costs about £73,000 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 a measured survey, design, a structural engineer, Waverley’s own building control charge and a 15% contingency, plan for £89,500 to £113,000.

How much is building control in Waverley?

Waverley’s own published charge for full plans approval of a 10 to 40 m² extension is £1,280 (including VAT). The charges apply from 1 April 2026.

How much does a loft conversion cost in Waverley?

A mid-range 30 m² dormer loft conversion in Waverley costs about £54,000 to £66,500 including VAT for the building work, and about £67,000 to £86,500 with fees, Waverley’s own building control charge and a 15% contingency.

Before you get quotes

Work in Waverley? Firm listings on Estiquote’s map of checked local firms open soon: see what you’ll need. Listing will be free while we build the map, with at least 30 days’ notice before any charge.