Summary

Lead time disputes are one of the most common sources of friction between tradespeople and customers, and they're almost always avoidable — not because delays don't happen, but because the original lead time given was optimistic, undocumented, or driven by wanting to win the job rather than by the real constraints (bespoke item lead times, current job book, permitting or notification periods). A customer who books a kitchen fit "in a few weeks" and is still waiting three months later feels misled, even if every individual delay along the way was genuinely unavoidable.

The fix isn't promising faster lead times — it's being specific and honest about what the lead time is actually built from, putting it in writing, and communicating proactively the moment anything changes it. This matters most for jobs with a long tail of dependencies outside the tradesperson's direct control: bespoke joinery, kitchens, windows, boilers on backorder, or any job requiring building control notification or a specialist subcontractor's availability.

This article covers how to build an honest lead time estimate, what to put in writing before a deposit is taken, how to communicate a change without it feeling like an excuse, and where the legal position sits if a lead time slips badly.

Key Facts

Quick Reference Table

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Job Type Typical Lead Time Driver Realistic Lead Time Range
Standard call-out / repair Job book availability only Days to 1-2 weeks
Bathroom refit (stock sanitaryware/tiles) Job book + trade coordination 2-4 weeks
Fitted kitchen Bespoke unit manufacture/delivery 4-10 weeks
Made-to-measure windows/doors Frame manufacture, glazing spec 3-8 weeks
Bespoke joinery / staircase Design sign-off + manufacture 4-8 weeks
Extension / structural work Planning/building control + subcontractor coordination 8-16+ weeks from design to start
Boiler/heating replacement Usually stock, but check specific model availability Days to 2 weeks (longer if model on backorder)

Ranges are indicative — always confirm actual current lead times with named suppliers rather than relying on typical figures, as they shift with demand and supply conditions.

Detailed Guidance

Build the Lead Time From Its Actual Components

The most reliable way to avoid a lead-time dispute is to stop quoting a single intuitive number and instead add up what the lead time is actually made of: how soon the job can be slotted into the current job book, how long the slowest material or product in the job takes to arrive (this is very often the binding constraint, not the tradesperson's own availability), any statutory notice period for notifiable work, and a sensible buffer for the unexpected. State this breakdown to the customer rather than a single unexplained number — "we could start in a week, but the kitchen units are a 6-week order, so realistically week commencing [date]" is both more accurate and more credible than "about 6 weeks."

Confirm Supplier Lead Times in Writing Before Quoting a Date

A verbal lead time from a supplier or manufacturer is not a commitment — it's an estimate that can and does slip, especially for imported materials or high-demand product lines. Get a written confirmation (email, order acknowledgement, or supplier portal screenshot) of the expected delivery window before passing a start date to the customer, and build in a margin rather than quoting the supplier's most optimistic figure directly. If a supplier's lead time later slips, having the original written estimate protects the tradesperson's position when explaining the delay to the customer.

Put the Lead Time in Writing Before Taking a Deposit

The point at which a lead-time dispute is most likely to escalate is when a customer has paid a deposit against an expectation that then isn't met. State clearly, in writing, before any deposit is taken: what the lead time is, what it's based on, what could change it, and what the deposit actually secures (typically the job slot and/or a material order) as distinct from a guaranteed start date if the lead time is still provisional on supplier confirmation. This single piece of documentation resolves the large majority of lead-time disputes before they start, because it sets out clearly what was actually promised.

Communicate Changes as Soon as They're Known

If a lead time is going to slip — a supplier delay, a permitting hold-up, a prior job overrunning — tell the customer as soon as it's known, not close to or after the originally promised date. A proactive message ("just heard from the kitchen supplier — their delivery has slipped by two weeks, so our new start date is X, sorry for the change, I'll keep you posted") is received completely differently from the same delay only surfacing when the customer chases for an update. This is the single biggest driver of whether a slipped lead time damages the relationship or is accepted as a normal part of the process.

Quote a Window, Confirm a Date Later

For any job with genuine lead-time uncertainty (bespoke items, dependent trades, notification periods), avoid committing to a single fixed date at quoting stage. Instead, quote a start window ("week commencing" rather than a specific day) and confirm the firm date once the binding constraint — materials in stock, notification period elapsed, dependent trade booked — is actually resolved. This avoids the awkward position of having promised a specific date that then has to be walked back.

Frequently Asked Questions

The customer is pressuring me for a fixed date before I have supplier confirmation — what should I do?

Explain honestly that the binding constraint is the supplier's lead time, which hasn't been confirmed yet, and that committing to a specific date before that confirmation risks having to move it. Offer a window instead ("I expect to confirm an exact date within the next week, once I hear back from the supplier") — this is more professional than guessing a date under pressure and having to revise it later.

Can I charge the customer if a lead-time delay is caused entirely by my supplier?

Generally the tradesperson absorbs the reputational and scheduling cost of a supplier delay rather than passing on an additional charge, since the customer's contract is with the tradesperson, not the supplier. Whether the tradesperson has any recourse against the supplier for their own losses (e.g. under the supplier's own terms) is a separate commercial question, but it shouldn't change what's communicated to the customer — be honest that it's a supplier delay, but don't use it to justify extra charges to the customer unless specifically agreed in the original terms.

How long a delay before the customer has a legal right to cancel?

The Consumer Rights Act 2015 states that, if no specific time was agreed, the service must be completed within a "reasonable time" — what counts as reasonable depends on the nature of the job, but a substantial and unexplained delay well beyond the originally communicated range can give the customer grounds to treat the contract as at an end and seek a refund of deposits paid for work not yet delivered. Clear, proactive communication throughout a delay is the best protection against this escalating, since it demonstrates the delay was managed reasonably rather than ignored.

Should I quote longer lead times than I expect, to build in a safety margin?

A modest, honestly-labelled buffer is reasonable practice (e.g. quoting "4-6 weeks" rather than a single optimistic "4 weeks" figure), but deliberately padding lead times to avoid ever having to explain a delay risks losing jobs to competitors quoting realistic figures, and doesn't address the underlying problem if the true constraint (supplier lead time, job book) genuinely changes. Transparency about what the lead time is based on serves the relationship better than an arbitrarily inflated number.

Regulations & Standards