ePrivacy and GPDR Cookie Consent by Cookie Consent What percentage of construction costs do architects charge?

What percentage of construction cost do architects charge?

6 min read
Oct '25 • by Heather

Quick summary

Architects usually charge around 7-10% of your construction costs, which can vary depending on the project size, complexity, and the architect’s reputation. For small jobs like a rear extension, fees might be between £1,500 and £2,500 plus VAT, while bespoke designs could cost upwards of £20,000 plus VAT. These fees are typically a percentage or fixed sum, depending on the agreed approach.

Clients could expect to pay architects around 7-10% of the construction cost from their project.

Architects' fees can be calculated in three ways: a percentage basis, a lump-sum basis, or time charged by agreement. Expenses may be included within the agreed fee or charged separately. The fees charged will range based on the scale of the project, the complexities and also the size of the practice (their overheads) - so don’t get lured in by those fancy offices!

Percentage Basis

The architect will charge a percentage of your construction fees. Before fees can be estimated, the client and architect need to establish the services to be provided, the approximate construction budget and the nature of the work.

Lump-sum Basis

Lump sums are best used where the scope of the work can be clearly defined from the outset. It is important to define the parameters of services - i.e. time, project size and cost - where applicable, so that if these are varied more than an agreed amount, the lump sum itself may be varied.

Time-charged basis

This basis is best used where the scope of work cannot be reasonably foreseen or where services cannot be related to the amount of construction. It may be wise to set an upper limit on fees to be incurred, perhaps on a staged basis. Records of time spent on services will be made available to clients on reasonable request.

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