BUILDING PROJECT INFORMATION
Preparing Drawings and a Project Brief
Organise a clear building brief and drawing set, distinguish design stages, record revisions and give contractors consistent information for quotations.
Give the project information a clear purpose
A useful brief explains what you want to achieve, while drawings describe aspects of the proposal. They should work together rather than compete. If the written brief asks for a utility room but the latest layout omits it, a contractor may price a different project from the one you expect. Resolve that inconsistency before comparing offers.
This guide helps organise information; it does not produce a design or certify that documents are sufficient for construction. Ask the appropriate professionals what your project requires. You can make an initial enquiry without a finished drawing package, but the information needed for a developed construction quotation will be more specific than an early description of the idea.
Start with outcomes and priorities
Write a short account of the problem in the house and the result you need. List essential rooms or functions separately from preferences. Explain relevant practical requirements, such as storage, household access or a place to work, so the proposal can be assessed against actual use rather than only appearance.
Keep the brief concise enough to remain current. A long document that mixes outdated ideas with final instructions can create confusion. If a preference changes, update the current version and record which decision replaced it. You do not need elaborate software; a clearly labelled document is more useful than several informal notes without an agreed status.
A contractor can discuss an early idea even if the drawings are still being developed.
Distinguish drawing stages
A concept layout, planning application drawing and developed construction information have different purposes. Ask the person producing a document what it is intended to establish and what it does not cover. Do not describe an early sketch as construction-ready simply because its presentation looks professional.
A planning decision also relates to a particular submitted proposal and does not replace every other design or building-control requirement. Keep the relevant decisions and drawings together. If the proposal changes, ask whether earlier advice or approvals need review. This guide does not decide which revised application or assessment is required.
What each drawing is for
| Drawing stage | Common purpose | What to check before relying on it |
|---|---|---|
| Concept or early layout | Explore room arrangements and the general proposal. | Dimensions, feasibility and technical information may still be incomplete. |
| Planning submission | Describe the proposal for the relevant planning process. | A planning drawing does not automatically provide construction detail. |
| Developed construction information | Coordinate the design and describe work for pricing or construction, as appropriate. | Confirm outstanding structural, specification and approval details with the appointed advisers. |
Identify the appointed professional roles
Record who is responsible for design development, measured information, structural input and relevant applications. A contractor may offer some of these services, or you may appoint advisers separately. The information set should reflect the actual appointments rather than assume one person provides everything.
Ask how questions pass between the designer, engineer and contractor where those roles apply. If information from one party affects another’s work, identify the coordination point. A brief should not attempt to substitute for technical design by specifying a structural solution without assessment. Describe the outcome and obtain the appropriate advice for how it can be achieved.
The appointments may be separate. Check who is providing each part of the information.
Develops the proposed layout and the documents within their agreed scope.
Provides specialist structural input where required and appointed.
Prices or carries out the agreed work using the identified information.
Use consistent names and revisions
Give each current document a recognisable name, date or revision. Keep a simple register showing its purpose, author and status. Mark old alternatives clearly and avoid sending a folder containing several equally plausible latest plans. The contractor needs to know which version the quotation should use.
When a revision is issued, say what it replaces and ask whether the price or programme changes. Retain the earlier version for the project record, but separate it from the live pricing set. A clear register makes it easier to trace why an offer changed and avoids treating an outdated drawing as an unresolved alternative.
Example document register
FOR ILLUSTRATIONKeep superseded versions in the project record, but send a separate current set when requesting quotations.
When you request prices, identify the drawing revision and any decisions that remain open.
Add a specification at the right level
Drawings may show where something sits without defining the product, finish or responsibility. Record the decisions needed to understand what is being priced. For example, a kitchen outline may not establish cabinetry, appliances, worktops or who supplies and fits them. A window symbol may not identify the particular glazing specification.
Use named products where appropriate, or explain the requirement and ask for clear allowances when selections remain open. Avoid pretending every item is fixed at the initial stage. The useful distinction is between an agreed specification and an undecided selection, with a process for turning the latter into a clear instruction before related work depends on it.
A drawing may show a kitchen without specifying:
- Who supplies the cabinets and appliances
- Worktop and finish choices
- Allowance for fittings not yet selected
- Whether installation is included in the quote
Make inclusions and exclusions visible
List work within existing rooms as well as the new accommodation. An extension or conversion can involve service routes, openings and making good outside the main area shown on a feature plan. Ask the designer and contractor which connected tasks the scope needs to address.
Record customer-supplied items and separately appointed work. Include fitting, coordination and delivery responsibilities where relevant. A complete-looking drawing set does not automatically settle commercial boundaries. Use the quotation-comparison guide to check that contractors have interpreted the scope consistently and have identified any assumptions or exclusions.
Before sending the pricing set: identify making good in existing rooms, work outside the main extension or conversion area, and any items you will purchase or arrange separately.
Prepare a focused pricing package
Issue the same current information to each contractor whose offer you want to compare. Include a document register, concise brief, relevant drawings and the specification decisions available at that stage. State open questions rather than concealing them in a collection of mixed files.
Ask the contractor to identify the documents used and any further information needed. If a quotation is provisional pending assessment or design development, record that status. Consistent information helps comparison, but it does not force every contractor to reach the same conclusion about price, risk or the tasks required.
What to send for comparable prices
Current brief Outcome, priorities and the scope to be priced
Drawing register Current documents, revisions and their status
Specifications Agreed choices, allowances and open selections
Contractor questions Items to confirm, assumptions and exclusions
Keep the information usable during construction
Agree how instructions and revisions will be issued after appointment. A new drawing should not circulate without clarity about what it changes and whether cost or programme effects have been agreed. Keep the current information aligned with the written variation process.
Retain important clarifications with the relevant document. If a message resolves a specification question, make it easy to find later rather than leave it among unrelated conversations. Ask the contractor and advisers what they need for their own records. The objective is a dependable current description of the work, not a large archive that nobody can interpret quickly.
When something changes: issue the revised document, identify what it replaces and ask about any price or programme consequences before treating the change as agreed.
Share information proportionately
For an initial building enquiry, describe the work, location and available documents. Do not send sensitive personal records or assume every historic document is required. The service or contractor can identify what is useful for the next discussion. Sharing a drawing should have a clear purpose and appropriate recipient.
Any construction design, quotation and agreement remain with the parties you appoint. A clear brief can make the next conversation more productive while leaving property-specific technical decisions with the appropriate professionals.
Your Questions
How do I explain the difference between an idea drawing and construction information?
Identify the purpose and stage of each document when sharing it. A sketch may communicate an intended layout, while more developed information may be prepared for applications, coordination or pricing. Ask the appointed professional what the contractor can rely on and what remains outstanding. A document’s appearance or file name alone should not be treated as confirmation that every construction decision is resolved.
What should accompany drawings in a quotation brief?
Include a concise written scope, relevant specification choices, the intended level of finish and a list of matters still undecided. State supply responsibilities and any separate appointments. Make the work address and document revisions clear. Drawings and written information should support each other so contractors do not have to infer important inclusions from incomplete notes or an earlier conversation.
How can I stop contractors pricing different drawing revisions?
Maintain one clearly identified set for the quotation exercise and issue changes consistently to everyone involved. Record the revision and date, explain what has changed and request confirmation that prices reflect the update. Keep superseded versions distinguishable. A controlled issue process is more useful than assuming the newest attachment in a long email chain has automatically become the agreed basis.
Should I send every property document with my first enquiry?
Start with a focused summary and identify useful documents already available, rather than distributing a large unfiltered archive. Share information for a clear purpose with the relevant recipient, avoiding unnecessary personal material. The next discussion can establish what is needed for assessment or pricing. Organised current information generally helps more than volume without an explanation of its relevance.
Sources and Further Guidance
The official Planning Portal guidance explains how planning requirements vary by project type. It is a starting point for questions to raise with the local authority or appointed adviser.
Project-specific approval information; checked 25 October 2026
Guidance checked 25 October 2026. General information does not determine the requirements for an individual property.
Put the Information Into Practice
When the drawings and brief are ready for discussion, look at the relevant building work and what the next contractor conversation should cover.
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