Quick answer
Compare the sales contribution earned during the quiet period with the costs that would genuinely disappear if you closed it. Include preparation, customer habits and effects on other periods. Allocating a share of rent to a quiet hour does not mean closing that hour saves the rent.
Use several comparable periods
Collect sales, transaction counts and staffing for the hours in question across normal weeks. Note local events, seasonal changes, weather and product availability. Separate a consistently weak period from an unusually poor day.
Ask what else happens during those hours. Staff may prepare for dinner, receive goods or complete essential work while the shop is open. If those jobs still need doing after a change, their labour cost does not simply disappear with the customer-facing hours.
Calculate the contribution you would give up
Use sales on a consistent tax basis and subtract the variable product and selling costs associated with those sales. This is a decision calculation, not a complete profit-and-loss statement. State the costs included and ask your accountant for help where the distinction is unclear.
Original example: a quiet period produces £180 sales and £65 variable costs, leaving £115 contribution before the remaining costs. Closing removes that £115 unless some customers move their purchases to another time. Treat any expected transfer of sales as an assumption to test, not a certainty.
Count only genuinely avoidable costs
Suppose closing the period would save £90 of staffing and £15 of other running costs. The £105 saving is less than the £115 contribution lost, so the simplified result is £10 worse. If the staffing cannot actually be reduced because preparation still requires it, the saving is smaller again.
Conversely, a different period might have lower contribution and more avoidable costs. The conclusion depends on your numbers. British Business Bank's financial guidance supports looking beyond sales at the underlying financial position; the example here is independent decision arithmetic, not an industry benchmark.
| Change if closed | Amount |
|---|---|
| Contribution lost | −£115 |
| Staffing genuinely avoided | £90 |
| Other costs genuinely avoided | £15 |
| Simplified net change | −£10 |
Further reading: British Business Bank: Getting your business ready for finance
Consider the operating and customer consequences
Could reduced hours make collection awkward, disrupt supplier access or remove the time regular customers visit? Would a smaller offer or different staffing pattern work better? Do not assume the only choices are full service and complete closure.
Discuss proposed staffing changes properly and check contractual and legal implications before relying on a saving. Include reopening, preparation and closing time in the work plan. An owner replacing paid hours with unpaid personal work has changed the arrangement, not made the workload disappear.
Run a clearly communicated trial
If the case is plausible, choose a defined trial and update the door, website, business listings and ordering channels together. Tell regular customers the practical change and alternatives. Give staff one clear answer about when the business is open and what is available.
Review total weekly contribution, actual payments avoided, customer behaviour and the team's workload. Watch for sales moving into neighbouring hours or being lost altogether. Keep a record of the decision and revisit it when local demand changes; opening hours are an operating choice that needs evidence, not a permanent judgement on whether the business is working.
Unpickle can help you update recurring opening, preparation and closing jobs after an hours decision. Analyse sales and financial effects in your till and accounting systems. Adjust daily routines to the hours you choose.