Few rentals are let 52 weeks a year. See how the empty weeks between tenancies reduce your real income and yield, so you can budget honestly rather than assuming the property is never empty.
The let
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weeks
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Even a few weeks empty between tenancies quietly drags your real yield down. Budget for it rather than assuming 52 weeks let.
Income lost to voids
£877
4 weeks empty per year
Rent if fully let£11,400
Lost to voids− £877
Effective rent collected£10,523
Gross yield (fully let)6.33%
Gross yield (with voids)5.85%
Net after costs (with voids)£8,723
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Why voids matter more than people think
A couple of empty weeks each year is normal between tenancies or during repairs, but it comes straight off the top of your return. This tool compares your income and yield assuming the property is fully let against the reality of a few void weeks a year.
Worked example
950/month rent = 11,400 a year if let every week.
Four void weeks costs about 877 - so you actually collect around 10,523.
On a 180,000 property the gross yield slips from 6.33% to about 5.85%.
Build a void allowance into every projection - many investors pencil in two to four weeks a year, more for HMOs or higher-turnover lets.
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Frequently asked questions
How many void weeks should I assume?
Two to four weeks a year is a common allowance for a standard let. Use more for student or HMO properties, short tenancies, or hard-to-let areas.
Do voids affect my mortgage and bills?
Yes - the mortgage, council tax and standing charges usually continue while the property is empty, so a void hurts twice: lost rent and ongoing costs.
Report a bug or ask a question about this calculator
Important: BrickCrunch provides general information and estimates only — this is not financial, tax, mortgage or legal advice. Calculations are simplified and your circumstances may differ. UK tax and rate figures are checked against gov.uk (21 June 2026 (2026/27 tax year)) but rates change and errors are possible. Always confirm figures with gov.uk or a qualified professional before making decisions.
