The honest answer to "how much does an architect cost" is that nobody can tell you until they have seen the building. Anyone who gives you a figure over the phone, before they know whether your house is listed, whether the ground falls away at the back, or whether the last owner already used up your permitted development rights, is guessing — and a guess that turns out to be low is not a kindness.
What we can do is tell you exactly how the number is arrived at, what makes it move, and — the part almost nobody publishes — which costs on your project are not in the architect's fee at all. That last list is where people feel misled, and it is the most useful thing on this page.
The three ways architects charge
There are three common fee models in the UK. They are not interchangeable, because each one puts the architect's interests in a different place relative to yours.
A percentage of construction cost. The traditional model. The fee is set as a proportion of what the build ends up costing. It is simple to quote and it scales with complexity, which is a genuine argument in its favour. The problem is the incentive it creates: the architect is paid more when the building costs more. Most architects working this way are entirely straight about it and will still design to your budget. But you should at least notice that the mechanism exists, and you should ask what happens to the fee if the tender comes back over.
Hourly rates. Excellent for advice — a couple of hours on whether a site is worth pursuing, a review of someone else's drawings, a conversation with a conservation officer. Poor as a way to buy a whole project, because you cannot budget for it and you have no way of knowing in advance whether you are buying forty hours or four hundred.
A fixed fee per stage. This is what we do, and it is worth explaining why.
Why we price a fixed fee for each stage
Many architectural firms lure customers in with low starting fees, which they then make up by increasing costs towards the end of the project. That is a well-known pattern in this sector and it is the reason we price the way we do.
Every Archidite project runs through the six RIBA Design Stages: Preparation and Brief, Concept Design, Spatial Coordination, Technical Design, Manufacturing and Construction, and Handover. We quote a fixed fee against each of those stages, agreed before that stage begins.
Two things follow from that, and both of them favour you.
First, you know the cost of the work in front of you before it starts. Not an estimate that drifts.
Second, and more importantly, you can stop at the end of any stage. Plenty of clients do, entirely sensibly. Some take a scheme through to planning consent and then pause for a year while they arrange finance. Some get consent and hand the technical package to a contractor they already trust. Because the fee is stage by stage rather than one lump sum for an unbroken run to completion, stopping is a normal decision rather than a renegotiation.
The trade-off, in fairness: a fixed fee has to be based on a defined scope. If you change the brief substantially halfway through Stage 2 — a different building footprint, a second storey you had not mentioned, a change of use — that is new work and it is priced as new work. We will tell you at the time rather than at the end.
The detailed quote for architectural services comes at Stage 1, once we have been to the property and agreed what the project actually is. We do not quote before we have seen it, because the site is what determines the number.
What actually moves the fee
Two extensions of identical size can carry very different fees. These are the factors that do most of the work.
| Factor | Why it changes the fee |
|---|---|
| Listed status | Listed building consent is a separate application from planning permission, with its own evidence requirements. The design has to justify itself against the significance of the building, which means more survey, more drawing, more written argument. |
| Conservation area or designated landscape | Permitted development rights are usually restricted, materials come under scrutiny, and the scheme has to be argued rather than simply submitted. |
| The planning authority | Norfolk is not one planning environment. The Broads Authority is its own planning authority with its own local plan, and a scheme there needs work that the same scheme in a Norwich suburb would not. |
| The site itself | Sloping ground, restricted access, trees, drainage, proximity to a watercourse, an awkward relationship with next door. All of it has to be resolved on paper before it is resolved in brick. |
| How far you want to go | A scheme taken to planning consent is a different piece of work from one taken through technical design, tender and construction administration. |
| Level of visualisation | Photo-realistic images and 360-degree VR views are within our normal service. A physical 3D printed model is priced separately, according to size. |
A porch in Thorpe End and a two-storey rear extension at Stoke Holy Cross are both householder projects in South Norfolk. They are not the same job, and they should not carry the same fee.
The costs that are not in the architect's fee
This is the section to read twice. A residential project has a set of costs that sit outside architectural fees entirely, and clients who have not been warned about them experience each one as an unpleasant surprise. Which of these your project needs is settled early, at the feasibility meeting, so you can budget for the whole picture rather than a slice of it.
The planning application fee. Paid by you, directly to the local planning authority. It is a statutory fee, set nationally, and it is not something an architect marks up or absorbs. Your application is not validated — and the clock on your determination period does not start — until it has been paid.
Surveys. If an accurate measured survey of the existing building does not exist, one has to be produced. On a site where levels matter, a topographical survey is needed too. We procure these where they are not already available. You cannot design accurately from a tape measure and an old estate agent's floorplan, and errors found at Stage 4 are far more expensive than a survey at Stage 1.
Structural engineer. Any project that removes a wall, opens a rear elevation, or adds load to an existing structure needs structural design and calculations. This is a separate professional appointment.
Mechanical and electrical (M&E) engineer. Not needed on every domestic project, but needed on many — heating strategy, ventilation, and anything where servicing is more complicated than extending the existing system.
Specialist reports. Depending on the site: ecology and protected species surveys, arboricultural reports, flood risk assessment, heritage statements, energy and sustainability statements. Some of these are required to validate the application, which means they are not optional and they are not last-minute.
Quantity surveyor. We usually recommend one. A QS prices the project properly, tests it against your budget before you commit, and manages the tender process. On a project of any size the QS tends to save more than the appointment costs, largely by finding the problem while it is still a drawing.
Building control. Separate from planning permission and separately charged, whether you use the local authority or an approved inspector.
Other consultants where the project needs them. Landscape architects, interior designers, party wall surveyors.
And then the build itself, which is by a wide margin the largest number on the page and the one a quantity surveyor exists to help you control.
None of this is unusual and none of it is hidden. It is simply that most published guidance on architects' fees stops at the architect's fee, which gives a misleading impression of what a project costs to get from an idea to a finished building.
When you pay
Fees are tied to the stages, so payment follows the work rather than running ahead of it. In outline:
- Stage 1, Preparation and Brief. The feasibility meeting on site comes first, and it is free. The detailed fee quote follows it. This is the stage at which surveys and existing drawings are put in place.
- Stage 2, Concept Design. Options, site analysis, the sustainability approach, and 3D reviews of the emerging design.
- Stage 3, Spatial Coordination. The planning submission and its supporting documents. For smaller applications planning approval may take eight to ten weeks; for larger applications this could be thirteen to fifteen weeks, and it is sometimes delayed. That period starts when the authority validates the application, not when you press send.
- Stage 4, Technical Design. The information a contractor can build and price from, coordinated with the engineers and, where appointed, the quantity surveyor.
- Stage 5, Manufacturing and Construction. Site involvement, design queries, and the administration of the build.
- Stage 6, Handover. As-built information and completion.
If you want the full picture of what happens inside each of those, our companion article on the RIBA stages sets out what you receive, what you decide and what happens if you stop, stage by stage. The architectural design service page covers the same ground in summary.
How to get a number for your project
Use our fee calculator and fee guidance for a budget figure, or book the free initial consultation and get an answer based on your actual building rather than a category.
The consultation is on site, it costs nothing, and it exists precisely so that the quote which follows it is a real quote. We will review the site constraints, talk through what you want the building to do, flag the planning or technical challenges we can see, and set out next steps and indicative timelines. If we think the project is a poor idea, we will say so then rather than after you have paid for a design.
Call +44 (0) 1508 830 310, email info@archidite.com, or book a free initial consultation. You can also see the range of what we do on our architectural design service page and across our completed work.