House plans in the UK: what a full drawing set contains

What are the four stages of house plans?

Almost every disagreement about the price of house plans comes from two people meaning different stages. The four are sequential, each builds on the one before, and each has a different audience.

• Feasibility or concept plans — sketch layouts testing whether an idea works at all. No survey behind them, no scale guaranteed, and no use to a council. Useful for a conversation with a partner or an agent; useless as evidence.
• Planning plans — the scaled set the local authority requires to decide an application. Existing and proposed floor plans, existing and proposed elevations, a section where levels change, a 1:1250 location plan and a 1:500 block plan.
• Building regulations plans — the technical set the building control body checks. General arrangement plans, construction sections, structural layouts coordinated with an engineer, drainage, insulation build-ups and a specification against each Approved Document.
• Construction or working plans — the set the builder prices and builds from. Dimensioned setting-out, junction details, joinery and services coordination. Overlaps heavily with the building regulations set on domestic work.

What does a UK planning drawing set actually contain?

A compliant householder set is seven drawings. Each answers a question the case officer is required to ask, and the scales are prescribed because officers measure off them.

Every sheet needs a stated scale and a drawn scale bar, a north point on plans, a drawing number and a revision letter. The scale bar matters more than the ratio: a drawing issued at 1:100 on A1 and printed to A3 by the council is no longer at 1:100, but a bar rescales with the sheet and stays true.

Beyond the drawings, most councils publish a local validation list adding requirements to the national ones — a Design and Access Statement, a Heritage Statement where the property is designated, a Community Infrastructure Levy form, an arboricultural report where protected trees are within influencing distance.

How do building regulations plans differ from planning plans?

Planning plans describe what the building will look like and how it affects neighbours. Building regulations plans describe how it is put together and whether it is safe. They are separate consents with separate submissions, and work built under permitted development with no planning application at all still needs building control approval.

• Construction sections showing every layer of the floor, wall and roof build-up with U-values, membranes and cavity closers.
• Structural layouts naming each beam and lintel, coordinated so the sizes on the drawing match the engineer’s calculations rather than contradicting them.
• Foundation design against the ground conditions and any nearby trees — on shrinkable clay with mature trees, depths of 2.5 metres or more are routine.
• Drainage layout including any build-over agreement where the work crosses or comes within 3 metres of a public sewer.
• Fire strategy — escape routes, protected stair enclosures, fire-resisting construction and interlinked alarm positions.
• Compliance schedule setting out how the design satisfies each relevant Approved Document, which is what makes a plan check quick rather than iterative.

Who is allowed to produce house plans in the UK?

Anyone. There is no statutory restriction on who may prepare drawings or submit a planning application — you can draw and submit your own. What is protected is the title ‘architect’, which under the Architects Act 1997 may only be used by someone on the Architects Registration Board register.

In practice, three groups do the work. Registered architects, regulated by the ARB and often members of RIBA, whose training is weighted toward design. Chartered architectural technologists, chartered through CIAT, whose training is weighted toward technical design, construction detail and building regulations. And unregulated draughting services, which vary enormously and are the reason the professional indemnity question matters.

For a typical domestic project — an extension, a loft conversion, a remodel — the difficulty is technical and regulatory rather than aesthetic, which is why a chartered technologist is usually the better fit and roughly 30% cheaper. For a listed building or a scheme where the design outcome is itself the deliverable, a registered architect earns the premium.

How much do house plans cost in the UK?

Those are fixed fees against a defined scope, including the measured survey, the drawing set, the submission and the case management. The alternatives price differently: a registered architect on percentage terms typically charges 2% to 4% of build cost for the planning stage and 6% to 12% for full services, and hourly rates in London run £70 to £150.

Separate from the drawings are the statutory costs, which are national and identical wherever you are in England.

The cheapest house plans on the market — typically £300 to £600 online — are cheap because they exclude the measured survey and the council case management. Both are avoidable costs right up until they are not: a set drawn without a survey disagrees with the building, and an unanswered officer query becomes a refusal.

House plan questions answered