If you are planning an extension or a loft conversion, one of the first questions is simple: how much does an architect cost to draw plans? The honest answer is that it depends on what you are building and how much of the job you want handled for you — but the ranges are well established, and you should never be left guessing.
This guide sets out what drawings actually cost in the UK in 2026, the three ways architects charge, the council fees that sit on top, and how to tell a fair quote from a vague one.
How much does an architect cost to draw plans? The short answer
For most UK homes, architectural drawings cost between £1,000 and £5,000+, depending on scope.
- £1,000–£2,500 — planning drawings only for a single-storey extension. Existing and proposed plans, elevations and a site plan: enough to make a planning or permitted development application.
- £2,500–£5,000 — a complete set, adding building regulations drawings so a builder can price and build from them.
Larger, two-storey or structurally awkward projects push towards the upper end and beyond. A straightforward garden room or porch sits at the bottom.
The gap between those two bands is the single biggest source of confusion in quotes. A £1,200 quote and a £3,200 quote are often not the same job at all — one stops at planning, the other carries you through to something you can build from. Always ask which you are being quoted for.
What drives the price of architectural drawings
Size and structural complexity
A rear extension on a standard 1930s semi is well-trodden ground. Removing a chunk of load-bearing wall, working around a sloping site, or wrapping around a corner all add drawing time and coordination.
Planning drawings or the full technical set
Planning drawings show what the building will look like. Building regulations drawings show how it goes together — insulation, foundations, structure, drainage, ventilation. Most people need both eventually, so it is usually cheaper to buy them together than to come back for the second half later.
Specialists you may also need
A structural engineer’s calculations typically cost £700–£2,000 where steel beams or new openings are involved. Some projects also need a drainage survey, a soil test or thermal calculations.
How much of the process is handled for you
Drawings alone are cheaper than drawings plus submitting the application, chasing the case officer and answering the council’s queries. That admin is real work, and whether it is included changes the number significantly.
The three ways architects charge
1. A percentage of build cost
Traditional practices often charge 7–15% of the total build cost. On a £50,000 extension that is £3,500–£7,500. The awkward part is that the fee rises as the build cost rises, so the person designing your project is paid more when it gets more expensive.
2. An hourly rate
Typically £50–£100 per hour. Fine for small pieces of advice, harder to budget for across a whole project — you find out the total at the end.
3. A fixed price
One agreed figure, confirmed before work starts. You know what you are paying on day one, and a change of mind about the layout does not quietly become an invoice.
For a typical home extension or loft conversion, a fixed price is almost always the easier thing to budget around. It is the reason we only quote that way.
Council fees you also need to budget for
Your drawings fee is separate from the council’s application fee. These are set nationally, so nobody can shop around on them.
- England: the householder planning application fee is £548 from 1 April 2026 (the annual inflation uplift applied by the Planning Portal). Under draft regulations, applications made on or after 8 December 2026 are expected to rise to around £575.
- Wales: the householder fee is £585, set on 1 December 2025 and unchanged through 2026.
Building control is charged separately again by your local authority or an approved inspector. If your project falls under permitted development, you may not need a planning application at all — though a lawful development certificate is well worth having as proof.
Do you need a chartered architect to draw plans?
For a house extension or a loft conversion, usually not. “Architect” is a protected title, but the work most homeowners need — measured drawings, a planning application, building regulations details — is done every day by experienced architectural designers and technologists, generally at a lower fee.
A chartered architect earns their fee on one-off new builds, listed buildings and unusual design problems. For a rear extension on a suburban street, what actually matters is whether the person doing it knows your council, gets applications approved, and produces drawings a builder can price accurately.
What Arkiplan charges, and what you get
We are a remote-first residential practice working with homeowners across England and Wales. In 18 years we have helped more than 2,000 homes get permission, with a 94% planning and lawful development approval rate. Our clients pay on average £2,284 less than they would with a traditional architect.
Our prices are fixed and confirmed in writing before any drawing work begins. There are three packages on our pricing page:
- Essentials — for small and permitted development projects such as a garden room or a simple porch. Includes the 3D Home Scan, your planning or permitted development drawings, a build cost estimate, one video call with your designer, one round of changes, and submission plus council chasing.
- Standard — everything for a typical extension or loft conversion. Adds building regulations drawings, structural engineer’s calculations, a build-ready specification, three rounds of changes, a detailed build cost breakdown, council reply handling, party wall notice letters and an introduction to our Trusted Builder Network. Seven in ten clients choose this.
- Premium — end-to-end for complex or high-spec work: listed buildings, build-over-sewer applications and new builds. Adds an on-site soil test, CCTV drainage survey, tree survey, photorealistic 3D exterior renders, SAP and thermal calculations, a party wall notice pack and unlimited redraws.
You can see what this looks like in practice on our completed projects and in our client reviews — 4.7 stars from more than 570 reviews.
How the process works and when you pay
A £499 payment books your 3D Home Scan and your remote design meeting, and it is fully refundable right up until the scan takes place. A technician scans your home in about an hour, then your designer sketches your proposal live on a 60-minute video call and confirms the planning route and build cost range.
You only decide whether to go ahead with the full project once you have seen your ideas. At that point you can pay up front or spread the balance over three monthly instalments, with no interest and no credit checks. After the survey and initial design consultation, if the proposal is not right for you, you can cancel — you are charged only for that survey and initial design work, and any remaining balance is refunded.
Drawings are typically complete in three to six weeks. The full sequence is on our how it works page.
How to compare quotes fairly
Before you compare two numbers, check they cover the same thing:
- Does it include building regulations drawings, or planning drawings only?
- Are structural engineer’s calculations included, or a separate bill later?
- Who submits the application and handles the council’s questions?
- How many rounds of changes are included before extra charges start?
- What happens if the application is refused — is a redraft included?
- Is the survey included, and how accurate is it?
A quote that answers all six is comparable. One that answers two is a starting price.
Frequently asked questions
How much does an architect cost to draw plans for a single-storey extension?
Expect £1,000–£2,500 for planning drawings and £2,500–£5,000 for a full set including building regulations drawings. See our house extension drawings and ground floor extension plans pages for what is included.
How much does it cost to have plans drawn for a loft conversion?
Similar ranges apply. Lofts are usually structurally busier than a ground-floor extension, so engineer’s calculations are almost always needed — our loft conversion drawings page covers the detail.
Is the council fee included in an architect’s quote?
Normally no. The planning application fee is paid to the council and is set nationally — £548 in England from 1 April 2026 and £585 in Wales. Check whether your quote includes submitting the application, which is a different thing from paying for it.
Can I get a price before committing?
Yes. You can book a free remote design meeting with our founder, Dave, and your fixed price is confirmed in writing afterwards — speak to an expert to arrange it.