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It’s difficult to give specific quotes without understanding the scope and detail of a client’s brief. Though, we do understand that costs are in the forefront of everyone’s minds when building an extension or a new home.

With this in mind, and with certain assumptions made, I have listed some ballpark fees to give you a better idea of budgeting costs.

My fees will include*:

    • Dimensional site & property survey and land topography 

    • Complete a desktop study of the site (risk assessment, site history, planning policy etc.)

    • Produce accurate plans of the existing site and buildings
    • Create an initial design, according to the client’s brief
    • Design revisions and refinements, with eventual sign off
    • Produce, submit and monitor planning application or lawful development certificate
    • Produce and submit a Building Regulations application
    • Address any final conditions or requests from Building Control

*I am currently not registered for VAT


​Assuming an extension is made to an existing 2 or 3 bedroom property, using one of these options as an example:

    • One en-suite double-bedroom with dressing room or
    • An open plan kitchen day-room or
    • An office study and adjoining bathroom

      Up to 25m2 floor area: between £3,000 and £5,000

    • Two en-suite double bedrooms with dressing rooms or
    • An open-plan kitchen day-room, with adjoining study and small bathroom or
    • An en-suite granny-annexe with a small studio kitchen 


      Up to 50m2 floor area: between £6,000 and £8,000


A 2 or 3 bedroom detached house with kitchen, dining, living, bathroom and 1 or 2 en-suites:

Up to 120m2 floor area: between £15,000 and £20,000

A large 4 or 5 bedroom detached house with kitchen, dining, living, 2 bathrooms and 2 or 3 en-suites:

Up to 200m2 floor area: between £25,000 and £30,000


Some examples of additional services and fees would include:

  • Working with listed buildings and conservation projects

  • Working with complex, difficult sites or unusual builds

  • Designing and building to Passive House standard

  • Significantly larger builds (over 200m2)

  • Extensive and frequent changes to the brief

  • Party wall agreements, planning appeals and negotiating with utilities

About my fees: FAQ
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