Ashbridge Design’s published planning stage prices start at £650 for a single storey extension and £850 for a double storey extension. These are starting design fees for projects in England. You receive a fixed quote once the scope has been reviewed. Council planning and building control charges sit outside those design fees. See Ashbridge’s current prices and package details.
Compare What the Planning Quote Covers
Ask for the scope in writing. Ashbridge’s planning stage covers a measured survey, drawings of the existing house, design options, planning drawings, submission and management, and changes the council requests. Check how the quote treats a change of brief after you have agreed a design. Ask whether the location and site plans are included, since Ashbridge lists those as a benefit of booking both stages together.
Be clear about the outcome you are paying for. A quote for producing the plans may leave you to submit the application and respond to the council. A managed package can include those tasks. If an application is refused, check whether a revised proposal and resubmission are included in your particular package. Neither a drawing fee nor an application fee guarantees approval.
Allow Separately for the Application and Technical Design
The local planning authority’s fee depends on the application route. A householder planning application and an application for a Lawful Development Certificate have different fee arrangements. Use the relevant fee schedule for England when you are ready to submit. Ask about any third party reports or map purchases that the planning application needs.
Technical design is a separate stage. Ashbridge’s published starting prices for planning and Building Regulations drawings together are £1,350 for a single storey extension and £1,650 for a double storey extension. The Complete packages, which also include structural calculations, start at £1,695 and £2,195 respectively. If you intend to get a builder’s quote soon, ask how those options affect when the builder can price the work in detail.
What Can Move the Price?
A wraparound layout, work to a listed property, or a design in a conservation area may need a project quote. A complex site can require an additional survey. The published price page also notes that a measured survey outside the in-person area may carry a travel supplement. Get the total for your property before committing and ask which items can be scoped later.
Example: Comparing Two Single Storey Quotes
A homeowner has one quote for planning drawings and a second quote that includes the measured survey and council submission. They ask both suppliers to list the deliverables, the fees payable separately and the treatment of council comments. They also ask each supplier to price the technical stage on the same brief. They can now compare a planning-only purchase with the cost of progressing to drawings their builder can price.
If you know the location, approximate size and number of storeys, ask for a written scope and a fixed fee through Ashbridge’s extension design pricing page.