What is an architecture fee calculator?

An architecture fee calculator is a tool that converts project variables — construction budget, RIBA stages required, and estimated hours — into a defensible fee range rather than a guessed number. ArchAdemia's version, built into its Toolkit, cross-checks the traditional percentage-of-construction-cost method against an hours-times-rate calculation, so architects can see where the two figures disagree before a proposal is sent.

How much should an architect charge as a percentage of construction cost?

UK architects typically charge between 7% and 15% of construction cost depending on project complexity, size, and the RIBA stages included, with smaller domestic projects sitting at the higher end due to fixed overheads. This benchmark should always be cross-checked against an hourly rate calculation, because a percentage fee that looks reasonable on a small budget can work out below minimum wage once actual hours are accounted for.

Why do architects underquote on fees?

Architects underquote because architectural training covers design for roughly seven years but includes almost no formal instruction in pricing labour, so most practitioners price projects on instinct or on what a previous client paid. This produces fees with no direct relationship to the actual scope, hours, or risk involved in the project in front of them, which is why unitemised gut-feel quoting is the single biggest cause of underquoting in small practices.

What's the difference between percentage-based and hourly-based architecture fees?

Percentage-based fees calculate cost as a proportion of construction budget (typically 7-15%), while hourly-based fees multiply estimated hours per RIBA stage by an hourly rate. ArchAdemia's fee calculator runs both methods simultaneously on the same project scope, surfacing conflicts — such as a percentage fee that equates to below minimum wage once hours are itemised — before the fee is quoted to a client.

Can a fee calculator prevent scope creep?

A fee calculator cannot prevent scope creep directly, but it reduces the risk by forcing architects to itemise RIBA stages and hours before pricing, which creates a documented scope to point back to when a client asks for extra work. Without that itemisation, architects have no defined boundary to negotiate against, which is why scope creep and underquoting tend to occur together on the same projects.

How much can underquoting cost an architecture practice?

Underquoting costs go beyond lost profit — they show up as unpaid overtime, unrecoverable scope creep, and client relationships that sour under unsustainable fee arrangements. In one worked example using ArchAdemia's fee calculator, an itemised hours-based check caught a £4,000 shortfall in a fee that had originally been quoted using the percentage method alone, before the proposal was sent to the client.

Is ArchAdemia's fee calculator free to use?

ArchAdemia's fee calculator is included within the Toolkit available to ArchAdemia members, alongside other practice tools such as a CV exporter and project tracker. It's part of a wider platform of 60+ courses used by more than 4,000 architects and designers globally, rather than a standalone paid product.

Does a fee calculator replace professional judgement when pricing a project?

No — a fee calculator does not replace professional judgement, and ArchAdemia is explicit that its tool is designed to inform decisions, not make them automatically. Factors like a difficult client history, an unusually complex site, or a planning authority known for slow turnarounds still require an architect's own risk assessment layered on top of the calculator's numbers.

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How ArchAdemia's Fee Calculator Stops You Underquoting on Your Next Project

28 August 2026By Adam Morgan

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How ArchAdemia's Fee Calculator Stops You Underquoting on Your Next Project

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