Commercial property void periods: what they cost and how to manage them

A void period is the stretch of time a commercial property, or a unit within it, stands empty between one tenant leaving and the next moving in. During a void the owner collects no rent but keeps paying the bills the property generates, so a void is not a neutral pause; it is an active drain. For an industrial investor, the length and frequency of voids across a holding is one of the biggest single determinants of whether the actual return matches the headline yield, because a yield quoted on full occupancy quietly assumes the voids away.

This guide explains what a void period is, the three costs it imposes, how long industrial voids typically run and what the current vacancy data shows, how to model a realistic void allowance into an appraisal, the practical steps that shorten voids, and the part that matters most to our clients: how lenders treat void risk when they size a loan. We arrange finance for industrial investors as a broker and introducer, not a lender, and nothing here is financial, tax or legal advice.

What is a void period in property?

A void period is simply any period during which a lettable space is vacant and producing no income. It begins when a lease ends or a tenant leaves and runs until a new tenant takes occupation and starts paying rent. On a single-let unit the void is all-or-nothing: the building is either let and earning or empty and costing. On a multi-let estate the picture is more granular, because individual units fall vacant and re-let at different times, so the estate runs at a fluctuating occupancy rate rather than a binary state.

Voids arise for ordinary reasons, not just bad ones. A lease reaches its natural expiry and the tenant does not renew; a tenant exercises a break clause; a business fails, downsizes or relocates; or a newly built or refurbished unit waits for its first occupier. Some voids are planned and productive, for instance a deliberate vacancy to refurbish a tired unit and re-let it at a higher rent, the refurb-to-relet play. Others are involuntary and pure cost. The investor's job is to keep the involuntary ones short and few.

The reason voids matter so much is that property is priced on net income, and a void cuts straight into it. A unit advertised at a 7 percent yield on full occupancy that sits empty for three months of a year is not really delivering 7 percent; it is delivering that yield on nine months of rent minus three months of holding costs. Understanding void risk is therefore inseparable from understanding the real return on an industrial investment, a theme we develop in our pillar guide on whether industrial property is a good investment.

What does a void period actually cost the owner?

The obvious cost is lost rent, but it is only the first of three. While the unit is empty the owner forgoes every pound of rent the space would have produced, and that lost income never comes back; a void is a permanent dent in the year's return, not a deferral. On a unit let at £100,000 a year, every empty month costs roughly £8,300 in rent alone before anything else is counted.

The second cost is empty business rates. When a commercial unit becomes vacant, rates relief applies for a limited period, generally three months for most commercial property and six months for industrial and warehouse premises, after which the owner becomes liable for the full empty-property business rates on space producing no income. For an empty warehouse that liability can be substantial, and it is the cost that turns a long void from painful into serious. There are legitimate mitigations, but the headline point stands: beyond the relief window, the empty building taxes its owner.

The third cost is everything else the property generates regardless of occupancy: the service charge on common parts that a tenant would normally fund, buildings insurance, security and maintenance to keep an empty unit weathertight and insurable, marketing costs to re-let, and often a rent-free incentive or a contribution to the incoming tenant's fit-out to close the next letting. Together these can make the true cost of a void meaningfully higher than the lost rent alone, which is why a void allowance in an appraisal should capture all three.

How long do industrial void periods last?

There is no single number, because void length depends on the unit, the location and the market, but industrial property has run shorter voids than most commercial sectors for several years, and the vacancy data shows why. UK logistics vacancy stood at 7.08 percent at Q4 2025 on the CBRE series, with 46.6m sq ft of available space, while Knight Frank's series put it at around 7.5 percent at the end of 2025, up from 5.5 percent at the end of 2023 as the recent speculative pipeline was absorbed (CBRE, UK Logistics Q4 2025; Knight Frank, UK Logistics Market Dashboard). Both figures sit below the vacancy rates typical of offices and much of retail, which is part of why industrial has priced so keenly.

Within that average, the spread is wide. A well-specified, well-located unit in a supply-starved market, particularly the small and mid-box space covered in our guide to multi-let industrial estates, can re-let in weeks because occupier demand outstrips new supply. A tired, poorly located or functionally obsolete unit, the wrong size, low eaves, weak power, a poor EPC, can sit empty for many months or longer until it is refurbished or its rent is cut to clear. The building's quality, in other words, is the main driver of how long its voids run.

Type of letting matters too. Re-letting a unit to a similar occupier on similar terms is usually quicker than a change of use or a re-positioning. And the wider cycle bites: when take-up is strong, big-box take-up reached 25.6m sq ft in 2025, up 22 percent on the year (CBRE, Q4 2025), voids shorten across the board; when demand softens, they lengthen. An investor should plan for the void the worst plausible market would impose, not the best, which is the discipline the next section sets out.

How do you model a void allowance into an appraisal?

A void allowance is the amount of vacancy you deliberately build into your numbers so that the projected return reflects reality rather than the optimistic case of permanent full occupancy. The simplest method is a percentage haircut to gross rent: assume the property runs at, say, 95 percent occupancy rather than 100 percent, which shaves 5 percent off the rent line every year as a standing provision for the rolling reality that, across a holding and over time, some space is always between tenants.

A more honest method models the actual lease events. Take the tenancy schedule, identify when each lease expires or has a break, assume a void of a realistic length at each event, three, six or more months depending on the unit and market, and overlay the holding costs, lost rent, empty rates after relief, service charge and insurance, and a re-letting incentive, across each gap. This event-driven approach shows the lumpy reality that voids cluster around lease ends, which a flat percentage smooths away, and it is the version a lender's analysis will resemble.

Whichever method you use, the point is to stop a void being a nasty surprise. An appraisal that assumes uninterrupted full occupancy is not conservative, it is wrong, because no real holding stays fully let forever. Building a sensible void allowance in from the start protects the projected return and, just as importantly, makes the numbers credible to a lender, who will apply their own void assumption whether or not you have applied one. Our rental yield calculator helps you see how a void haircut moves the net yield.

How do you reduce and manage void periods?

The most effective defence is built before a void ever happens, in the choice of asset. Units that are well located, well specified and in scarce supply re-let fastest, so buying quality, and keeping it well maintained with a sound EPC, is itself void management. A tired unit with a poor energy rating not only takes longer to re-let, it may be unlettable until upgraded, so proactive refurbishment between tenants is often cheaper than a long enforced void, a calculation we explore in our guide to refurbishing industrial units.

Active asset management shortens the voids that do occur. Engaging tenants well before lease expiry to negotiate a renewal, rather than waiting for them to leave, prevents many voids outright. Where a void is unavoidable, instructing letting agents early, presenting the unit well, being realistic on rent, and offering sensible incentives, a short rent-free period or a fit-out contribution, all close the next letting faster. On a multi-let estate, staggering lease expiries so they do not all fall together stops a cluster of simultaneous voids from hitting income at once.

Diversification is the structural answer. A single-let unit concentrates all void risk on one tenant decision: when it leaves, income goes to zero. A multi-let estate spreads that risk across many tenants, so one vacancy dents income rather than ending it, which is a large part of why multi-let estates and broader industrial portfolios are valued for the resilience of their income as much as its level. Voids cannot be eliminated, but they can be diluted.

How do lenders treat void risk when sizing a loan?

Lenders never lend against the full rent roll as if it were guaranteed forever; they lend against income they expect to survive a void. The interest cover ratio, the rent divided by the interest bill, is tested not just on the passing rent but with a haircut for vacancy, so a loan that covers comfortably at 100 percent occupancy must still cover at the lender's assumed void level. That is why an investor's own void allowance and the lender's tend to converge: both are asking the same question, which is whether the income services the debt when, not if, a unit falls empty.

The structure of the income shapes the terms. A single-let asset, where a void takes income to zero, is underwritten more cautiously than a multi-let estate of similar value, because the estate's diversified income keeps servicing the loan even with a unit or two empty. Lease length, tenant covenant and the re-lettability of the space all feed the lender's void assumption: a strong covenant on a long lease in a low-vacancy market attracts a smaller void haircut and so supports more debt than a short lease on a hard-to-let unit. This is the same income-quality logic that drives industrial property yields, seen from the debt side.

We model this for clients before an offer goes in, sizing the debt against a stressed, void-adjusted income across our lender panel through our portfolio finance for multi-asset holdings and our refinance service when rents and occupancy have improved enough to release equity. The right facility and the right void buffer differ by asset, and getting that buffer right at the outset is what stops a vacancy from becoming a covenant breach. Most lending of this kind is unregulated; where security touches a home it is not, and we identify that early. Lending figures are indicative until terms are issued. Investors comparing markets can also browse our locations hub for where occupier demand, and so void risk, runs lightest.