Common Pricing Mistakes in a Drylining Tender — and How to Avoid Them
Drylining tenders are frequently lost through small omissions rather than one obviously wrong rate. A package can look competitive at first glance and still become unprofitable once access, waste, movement, interfaces and finishing expectations are understood. For a small subcontractor, a disciplined tender review is often more valuable than trying to be the cheapest bidder.
This guide is written for drylining and plastering firms preparing a subcontract price from drawings, specifications and an employer’s pricing document.
**Mistake 1: pricing from the plan without reading the specification
Drawings show locations and dimensions, but the specification controls performance. Fire, acoustic, moisture-resistant and impact requirements can change the board type, framing, insulation, fixings and installation sequence. A standard 12.5mm board rate cannot be used safely where the wall build-up requires multiple layers or tested details.
Before taking off, create a schedule of wall, lining and ceiling types. Record the board build-up, stud depth, gauge, centres, insulation, head detail, deflection allowance and finish. Where the drawing and specification conflict, raise a tender query rather than choosing the cheaper interpretation.
**Mistake 2: measuring only the face area
A square-metre take-off is a starting point, not a complete package. Openings, returns, reveals, shafts, bulkheads, risers, pattresses, service zones and perimeter details all consume labour and material. A wall with many doors can have a lower board area but a higher installation effort than a simple uninterrupted run.
Measure the areas, then separately count corners, T-junctions, jambs, head details, access panels and changes in build-up. For ceilings, record drops, steps, bulkheads, service penetrations and perimeter trims. These items should be visible in the estimate rather than buried inside an optimistic rate.
**Mistake 3: using a generic productivity allowance
Productivity depends on height, access, repetition, congestion, room size and the number of different details. A clear new-build floor is not comparable with a live refurbishment where materials must travel through a finished building and other trades are working around the package.
Split labour into framing, insulation, boarding, jointing and protection. Apply different outputs to open repetitive areas and detailed or congested zones. If the programme requires out-of-hours work, phased handovers or return visits, price the lost productivity rather than assuming the same output as a clear run.
**Mistake 4: ignoring waste and board optimisation
Board waste is not just a percentage added at the end. Sheet size, room dimensions, openings and staggered joints affect how much material can be recovered. Excessive waste may point to poor cutting plans, but an unrealistically low allowance can leave a subcontractor buying material at the worst point in the job.
Use a cutting review for repetitive rooms and allow separately for small pieces, damaged boards, fire stopping and protection. Metal stud and track also need allowances for laps, corners, noggings, deflection heads and damaged lengths. Keep the take-off auditable so a buyer can compare the allowance with the order schedule.
**Mistake 5: missing interfaces and exclusions
Drylining sits between several trades. The tender should identify who provides backing, pattresses, service penetrations, fire stopping, acoustic seals, access panels, trims, movement joints, making good and final decoration. If responsibility is unclear, the lowest tender may carry an unfunded obligation.
List assumptions and exclusions in plain language. Confirm who sets out, who provides access, who protects completed work and who deals with damage by follow-on trades. A clear interface schedule protects the price and gives the main contractor something specific to clarify.
**Mistake 6: leaving preliminaries and attendance until the end
Small packages still need supervision, setting out, handling, storage, waste removal, protection, welfare, access equipment and coordination time. If the site is occupied or phased, these costs can be significant. Include them as identifiable allowances so they are not silently absorbed into labour.
Check the proposed programme, working hours, delivery restrictions, hoist access and security requirements. A tender that includes realistic attendance is easier to defend when the site conditions change.
**Mistake 7: failing to test the number before submission
Before sending the bid, run a short commercial review. Compare the measured quantities with the drawings, test the labour output against the programme, and check that material rates, waste, plant, preliminaries and overhead recovery are included. Review the price against the scope, not only against competitors’ headline rates.
Record the risks that remain open: incomplete details, uncertain access, unresolved fire or acoustic requirements, and provisional work. If the contract is JCT or NEC, check how design responsibility, compensation events, notices and valuation rules may affect the package.
**A practical drylining tender checklist
- Create a build-up schedule for every wall, lining and ceiling type.
- Measure details, openings, returns, bulkheads and interfaces separately.
- Test productivity against access, congestion and the actual programme.
- Review waste, cutting, protection and material handling allowances.
- State assumptions, exclusions and unresolved tender queries.
- Check the commercial total before submitting the bid.
**QS and estimating support for drylining firms
A robust tender is easier to win and easier to deliver when the scope, quantities and risks are visible. Bayo Corp’s QS & Estimating Consultancy supports drylining and plastering firms with drawing take-offs, quantity checks, tender reviews and bid preparation.
Contact Bayocorp to discuss your next drylining estimate...
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