The short answer
For a typical UK home extension, an architect usually needs around 2 to 6 weeks to produce planning drawings once they have surveyed the property and agreed the design with you. The sequence is fairly fixed: a measured survey and existing drawings first, then concept design options (often 1–2 weeks), then the planning application drawings once you have signed off a layout. A separate building regulations and technical package — the detailed set the builder works from — typically adds another 3 to 8 weeks after planning is granted. Bigger or more complex projects take proportionally longer, and the single biggest variable is how quickly you make decisions. The drawing time itself is only part of the story: design sign-off and survey access usually set the real pace.
"How long to draw the plans?" usually means "when can I submit for planning?". The honest answer depends on the survey, the number of design rounds and how fast decisions get made — not just the architect's drawing speed.
Typical drawing stages
- Measured survey + existing plans~1–2 weeks
- Concept / design options~1–2 weeks
- Planning application drawings~1–3 weeks
- Building regs / technical set~3–8 weeks
- Decision time (your sign-offs)Often the real bottleneck
The drawing sequence, stage by stage
An architect does not draw planning plans on day one. The work follows the order of the RIBA Plan of Work, and each stage feeds the next:
- Survey and existing drawings: the property is measured and drawn up as it is now. This usually takes a few days to draw once the survey is done, and everything else relies on it being accurate.
- Concept design (RIBA Stage 2): the architect produces one or more layout options for you to react to. Expect one or two rounds of revisions before a scheme is agreed.
- Planning drawings (RIBA Stage 3): once you sign off a layout, the architect prepares the existing and proposed plans, elevations and a site/location plan for the planning application.
- Technical / building regs (RIBA Stage 4): after planning, the detailed construction drawings, sections and specifications are produced for Building Control and the builder.
Each handover waits on your approval. Plans cannot move from concept to planning until you have settled the layout, which is why decision speed matters as much as drawing speed.
Typical timescales by stage
The ranges below assume a standard domestic project — an extension, loft or remodel — and a property the architect can access promptly. Larger houses, listed buildings and complex sites all extend these.
| Stage | What you get | Typical time |
|---|---|---|
| Measured survey | Existing plans of the property | 1–2 weeks |
| Concept design | Layout options + revisions | 1–2 weeks |
| Planning drawings | Plans, elevations, site plan | 1–3 weeks |
| Planning determination | Council decision (separate) | 8 weeks+ |
| Building regs drawings | Technical/construction set | 3–8 weeks |
| Tender / construction info | Builder-ready package | Project dependent |
Indicative ranges only; vary widely by project size, firm workload and decision speed. Sources: RIBA Plan of Work 2020; Planning Portal.
What actually slows it down
Most overruns have little to do with how fast the architect can draw. The common causes are:
- Survey access: the architect can only start the existing drawings once the property has been measured. Booking the survey late delays everything after it.
- Indecision: requesting extra design options, or changing your mind on the layout after planning drawings have begun, is the most expensive delay of all because work is redone.
- Workload and season: spring and summer are peak extension season, so a busy practice may have a queue before they can start.
- Consultants: a structural engineer, drainage survey or arboriculturist may be needed before some drawings can be finalised.
- Listed or conservation status: these add documentation and care that lengthen the drawing stages.
How to get plans drawn faster
You cannot rush a careful design, but you can remove almost every avoidable delay. The biggest lever is making decisions promptly and giving a clear brief up front.
- Book the survey early: get the measured survey in the diary at the point of instruction so the existing drawings can start straight away.
- Bring a clear brief: a written list of what you want, your budget and any must-haves lets the architect aim the first concept close to the mark, cutting revision rounds.
- Limit design rounds: agree up front how many concept options you want, and try to settle a layout rather than reopening it.
- Instruct consultants in parallel: where a structural engineer or other specialist is needed, engage them alongside the architect so their input is ready when the drawings need it.
- Sign off promptly: the architect cannot move to the next stage until you approve the current one, so quick responses keep the programme moving.
It also helps to be realistic about the whole timeline. From first meeting to a planning-ready set is commonly a couple of months for a domestic project, and the full journey to builder-ready technical drawings is longer again. Engaging the architect early in your project, rather than when you are ready to build, is the simplest way to avoid feeling rushed at the end.
Frequently asked questions
Can an architect draw plans in a week?
For a very small, simple project where the property is already surveyed and the layout is agreed, basic planning drawings can sometimes be produced in around a week. A full extension with concept design, planning and technical drawings realistically takes several weeks across the stages.
Why do building regs drawings take longer than planning drawings?
Building regulations drawings are far more detailed. They show construction build-ups, insulation, structure, drainage and specifications the builder works from, whereas planning drawings mainly show the form, scale and appearance of the proposal.
Do I get the plans before or after planning permission?
You get the planning drawings first and submit them to the council for a decision. The detailed building regulations and construction drawings are usually produced after planning is granted, so you are not paying to detail a scheme that might change.
Sources & further reading
- RIBA — the RIBA Plan of Work and design stages
- Planning Portal — planning application timescales
- GOV.UK — planning permission for home improvements
Figures on this page are typical UK ranges drawn from published sources and depend on your specific project. They are guidance, not a quotation.