Commercial lease viability check
Check whether a commercial site can carry the rent before you sign.
YieldLens UK helps founders, operators, and small business tenants pressure-test rent burden, break-even customers, operating costs, fit-out risk, and downside trading assumptions before committing to a lease.
Indicative decision-support only. Not a formal valuation, legal advice, or financial advice.
The problem
A bad lease can quietly wreck a good business idea.
Commercial property risk is not just about whether the location looks busy. The site has to generate enough reliable revenue to survive rent, staff, rates, utilities, insurance, fit-out, and quieter months.
Rent is fixed, revenue is not
Once the lease is signed, rent becomes a fixed obligation. Revenue, customer volume, and average spend are still uncertain.
Fit-out spend increases the bet
A site can look viable monthly but still be unattractive once upfront fit-out, deposits, fees, and opening costs are included.
Optimism hides weak sites
If the site only works with perfect footfall, strong average spend, and low costs, it is not resilient. It is fragile.
What YieldLens checks
A structured site viability screen, not generic AI commentary.
The check turns a lease decision into practical numbers: rent burden, monthly cost base, break-even customers, and downside pressure.
Monthly revenue
Estimate revenue from average spend, expected customers, and opening days.
Rent burden
Compare monthly rent against estimated monthly revenue.
Break-even customers
Estimate the customers per day needed to cover rent and known costs.
Downside scenario
Test what happens if customers, spend, or costs move against the plan.
Who it is for
Built for people considering real commercial premises.
Use the check before you commit to viewings, heads of terms, legal work, fit-out planning, or a lease negotiation.
Risk flags
The risks that matter before signing.
The free check is designed to expose weak assumptions early, before they turn into expensive obligations.
Rent burden is too high
The site may need unrealistic turnover just to make the rent acceptable.
Break-even customers are unrealistic
The daily customer target may exceed likely footfall, especially outside peak trading hours.
Fit-out risk is ignored
Large upfront fit-out spend can make a site fragile even if the monthly numbers appear workable.
Costs are incomplete
Business rates, utilities, licensing, insurance, maintenance, staffing, or stock costs may be missing.
Trading assumptions are optimistic
Small reductions in customers or average spend can destroy the margin.
Lease terms create hidden pressure
Rent reviews, break clauses, permitted use, repairing obligations, and deposits can change the real risk.
Before you commit
Questions the site should answer before you sign.
These are the questions a commercial viability file should force into the open.
- What is the annual rent and monthly equivalent?
- What revenue is needed to make the rent burden acceptable?
- How many customers per day are needed to cover rent and known costs?
- What happens if customers are 20% lower than expected?
- What happens if average spend is 10% lower than expected?
- What happens if staff, rates, utilities, or insurance costs rise?
- How much fit-out spend is required before trading starts?
- What lease length, break clause, deposit, and repairing obligations apply?
- Are licensing, permitted use, planning, extraction, and trading hours suitable?
- Is there enough local demand to support the target customer count?
Example pressure test
The key question is not “is the rent expensive?”
The better question is whether the site can still survive if customer numbers, average spend, or operating costs are worse than expected.
Base margin
£10,860
Downside margin
£3,871
Stress case
Fragile
Example only. Actual outputs depend on the rent, costs, average spend, expected customers, and opening days entered by the user.
FAQ
Commercial lease viability questions
What is a commercial lease viability check?
A commercial lease viability check is an indicative pressure test of whether a site can support its rent and operating costs. It looks at rent burden, expected revenue, break-even customers, known costs, and downside assumptions.
Is this a formal valuation?
No. YieldLens UK provides indicative decision-support only. It is not a formal valuation, financial advice, legal advice, tax advice, or a substitute for professional due diligence.
Why does rent burden matter?
Rent burden shows how much of expected revenue is absorbed by rent. If rent takes too much of revenue, the business has less room for staff, rates, utilities, insurance, stock, tax, and quieter trading periods.
Why calculate break-even customers per day?
Break-even customers per day translates fixed costs into a practical trading target. It helps show whether the site needs realistic footfall or heroic assumptions just to cover rent and known costs.
Can this be used before heads of terms?
Yes. The check is most useful before you commit time, legal fees, fit-out planning, or lease negotiations. It can help decide whether the site deserves deeper investigation.
Start with the numbers
Run the free commercial check before you sign the lease.
Enter the rent, trading assumptions, and known costs. YieldLens UK will return the headline viability score, rent burden, break-even customers, risk flags, and downside scenario.
Run free commercial check