Architectural Tender Pack: Contents and Process
Updated: Aug 12
An architectural tender pack is the coordinated set of information issued to contractors so they can price the same defined project. It usually brings together drawings, specifications, scope and tender instructions, with other project information added according to the procurement route and complexity of the work.
For a homeowner, the practical benefit is comparability. A one-line quotation based on planning drawings may look attractive, but it can leave important assumptions hidden. A clearer tender package gives each contractor a more consistent basis for pricing, makes exclusions easier to identify and creates a better record of what has been requested.
It does not guarantee the lowest price or remove every construction risk. It improves the quality of the information used to make a contractor decision.
What is an architectural tender pack?
A tender pack is an invitation to price a defined scope of construction work. The exact documents vary with the project and procurement strategy, but the pack should answer five basic questions:
What is being built or altered?
What quality, materials and performance are expected?
Which parts of the design are complete, and which remain the contractor’s or a specialist’s responsibility?
How should the contractor present the price, programme, assumptions and exclusions?
What information and conditions will be used to assess the tender?
The RIBA Plan of Work describes Stage 4 Technical Design as the stage at which the information required to manufacture and construct the project is completed. The point at which a project is tendered can vary with its procurement strategy, so “tender information” and “fully complete construction information” should not automatically be treated as identical.
When do you need a tender pack?
A structured tender pack is particularly useful when:
more than one contractor will price the work;
the project includes an extension, renovation, loft conversion, new build or significant interior work;
the choice of materials and finishes affects the price materially;
structural or building-services coordination is required;
the client wants to compare exclusions, allowances and programme as well as the total price;
a formal building contract is expected after the contractor is selected.
For very small or exploratory works, a lighter scope may be proportionate. For complex residential work, asking contractors to fill gaps independently can produce prices that look comparable but cover different outcomes.
What should an architectural tender pack include?
Coordinated drawings
The drawing set may include plans, sections, elevations, construction details, demolition information, setting-out dimensions and schedules. The purpose is not to create more sheets for their own sake. It is to make the proposed work and the interfaces between elements clear enough to price.
Before issue, the architectural information should be coordinated with the available structural and building-services design. If a specialist contractor will complete part of the design, that responsibility and the information they must return should be stated rather than assumed.
Specifications and schedules
Specifications describe the required products, workmanship, standards and performance. Schedules can set out doors, windows, finishes, sanitaryware, fittings or other repeated components.
This information is important because a generic allowance for “flooring”, “windows” or “kitchen” can conceal a large range in cost and quality. Where a product has not been selected, the pack should use a clear allowance or performance requirement and explain how later selection will be valued.
Scope and pricing information
The contractor needs a structured way to show what is included. Depending on the project, this may be a schedule of works, pricing document, bill of quantities or another breakdown agreed with the project team.
A useful return should expose:
the base price and VAT treatment;
provisional sums and prime cost allowances where used;
exclusions and qualifications;
proposed programme and lead times;
contractor-designed portions;
alternative proposals;
requested information about the contractor and key team.
The goal is to compare like with like and identify differences before appointment, not after construction has started.
Tender and contract information
The pack may also include the invitation to tender, return deadline, assessment method, site-visit arrangements, proposed contract particulars, insurance requirements and rules for questions or clarifications.
JCT’s current Tendering Practice Note separates the process into preliminary enquiry, invitation/tender, and assessment/award. For a private residential project, the procedure should remain proportionate, but it still benefits from a clear deadline, consistent information and a recorded evaluation.
Pre-construction information
Construction health and safety information is not an optional appendix to ignore. Under CDM 2015, relevant pre-construction information held by the client, or reasonably obtainable, must be provided to designers and contractors bidding for or appointed to the work. This can include existing surveys, known site hazards, structural information and project constraints.
The information should be project-specific and proportionate. A tender pack should make clear where it is included and who is coordinating it.
Is a planning drawing set enough for tendering?
Usually not for a substantial build.
Planning drawings primarily communicate the proposal for planning assessment. They do not necessarily define junctions, build-ups, performance, finishes, services coordination or the allocation of design responsibility at the level needed for reliable construction pricing.
Building regulation information serves a different purpose again: demonstrating how the work will comply with applicable technical requirements. Some documents may support both approval and tendering, but the client should not assume that receiving planning permission means the project is fully described for a contractor.
If you are unsure what has been completed, ask for a deliverables list showing which drawings, specifications, calculations and schedules will be issued and which consultants or specialists are responsible for each item.
How does the tender process work?
1. Confirm the brief and procurement route
Agree the scope, budget priorities, programme constraints and how design responsibility will be divided. Resolve major unknowns or label them clearly.
2. Prepare and coordinate the information
Develop the drawings, specifications, schedules and project information to the level appropriate for the agreed route. Check references and revision numbers before issue.
3. Select suitable tenderers
Assess relevant experience, capacity, financial standing, insurance and the proposed team. A low price is not useful if the contractor is not suitable for the work or cannot meet the programme.
4. Issue one controlled pack
Give tenderers the same documents, return format, deadline and route for questions. Record clarifications and issue the same material information to all tenderers where appropriate.
5. Review returns consistently
Compare scope, exclusions, allowances, programme, qualifications and quality evidence—not only the final number. Investigate unusually low or incomplete pricing before recommending an appointment.
6. Close gaps before contract
Record agreed clarifications, update the contract documents and confirm which tender assumptions survive into the building contract. Avoid relying on scattered emails as the only record of scope.
Common tender-pack problems
Issuing planning drawings without enough technical or specification information.
Leaving consultant and specialist design responsibilities undefined.
Comparing totals without normalising exclusions and allowances.
Allowing different tenderers to price different revisions.
Selecting a contractor before checking programme, team and relevant experience.
Failing to carry tender clarifications into the final contract documents.
A good pack cannot prevent every variation. It can reduce avoidable ambiguity and make the remaining decisions more visible.
Frequently asked questions
How much does an architectural tender pack cost?
The fee depends on project size, complexity, existing information, procurement route and the consultants needed. Ask for a written scope of services and deliverables rather than comparing fees without checking what each appointment includes.
Does a tender pack include structural calculations?
It may include or reference structural information, but this depends on the structural engineer’s appointment and the design stage. The responsibility matrix should identify who prepares, coordinates and completes each element.
Does a tender pack guarantee a fixed construction price?
No. The final commercial position depends on the returned tender, clarifications, contract, allowances, later changes and site conditions. Better information supports a more informed price; it does not eliminate uncertainty.
Can the same drawings be used for construction?
Only if the project team confirms that they are suitable for construction and identifies any outstanding specialist design or approvals. A “tender” issue status should not automatically be treated as a “construction” issue status.
Plan the tender before asking for prices
The most useful tender exercise begins before the documents are issued. Agree what is being priced, what remains undecided and how returns will be compared.
Explore J.LEO’s architectural design and tender work, review the building regulation design service, or talk to J.LEO about your project.
Evidence Sources
The article is general information for projects in England and is not project-specific legal, procurement, planning or building-control advice.
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