How Much Is a Commercial Property Void Period Really Costing You?

When a commercial property becomes vacant, most landlords focus on the most visible number: the rent they are no longer receiving. The true cost of a commercial void is considerably higher — and when you add up every component, the financial incentive to fill the space quickly becomes much sharper than the rent alone suggests.

This guide breaks down every element of commercial void period cost in the current UK market, with figures you can apply to your own property.

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Component 1: Lost rent

The headline number. A property with a rateable value capable of commanding £30,000 per year in rent generates zero income during a void. Across a 6-month void, that is £15,000 of lost income. Across a 12-month void, £30,000. This is the figure most landlords focus on — but it is only the beginning.

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Component 2: Empty property business rates

This is frequently the most damaging cost of a commercial void, and the one that catches landlords off guard.

<cite index="18-1">When a property becomes vacant, the owner (landlord) becomes liable after a short empty property relief — typically three months for most uses or six months for industrial and warehouse. After that, full rates usually resume until the space is re-occupied.</cite>

The scale of this liability is significant. <cite index="19-1">A landlord's office unit with a rateable value of £40,000 faces a full empty-property charge of £40,000 × 0.432 (the 2026/27 small business multiplier) = £17,280 a year for as long as it stays empty.</cite>

In other words, a vacant office with a rateable value of £40,000 generates an empty rates liability of approximately £1,440 per month once the initial relief period expires. Add the lost rent and the monthly cost of vacancy is over £3,900.

The 13-week rule: <cite index="16-1">From 2025, the rules have tightened. Landlords must now show 13 weeks of continuous occupation before a new period of relief can begin. Previously, six weeks of temporary occupation was enough to restart the relief clock. This change reduces flexibility and increases the risk of paying full rates on long-term voids.</cite>

The practical implication: the short-term occupation strategy that some landlords previously used to manage rates liability — placing a friend or related company in the property briefly to reset the clock — is significantly less effective than it was. Finding a genuine tenant, on genuine terms, is now more important than rate mitigation workarounds.

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Component 3: Void building insurance

Your standard commercial property landlord insurance typically requires the property to be occupied. When it becomes vacant, most policies require you to notify your insurer and switch to void (unoccupied) property insurance — which is more expensive, has more exclusions, and may require specific conditions to be met (heating maintained, regular inspections, letterbox sealed and post removed).

Typical void property insurance for a commercial unit runs to hundreds of pounds per month depending on property size and value. Budget approximately 0.1–0.2% of the property's rebuilding cost per month as a rough guide.

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Component 4: Maintenance and security costs

An unoccupied commercial building deteriorates faster than an occupied one. Without occupier maintenance, minor defects become major ones. Without daily footfall providing informal security, vacant properties attract vandalism, fly-tipping, and sometimes squatters.

Additional costs during a void may include:

• Security patrols or CCTV monitoring — for larger or higher-risk properties
• Heating maintenance — maintaining minimum temperatures to prevent frost damage and void the risk of burst pipes
• Grounds maintenance — unattended external areas deteriorate quickly and create a poor impression on prospective tenants
• Minor repairs — addressing leaks, broken guttering, or other defects that would normally be picked up immediately by an occupier
• Utilities standing charges — even with services disconnected, standing charges continue on many tariffs

For a medium-sized commercial unit, these costs may total £500–£2,000 per month depending on the property type and the level of security and maintenance employed.

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Component 5: Agent marketing costs

Advertising on commercial portals costs money. CoStar, Rightmove Commercial, and other platforms charge subscription or per-listing fees. Professional photography, floor plans, and brochure preparation add further costs. For a property that remains vacant for 12 months, marketing costs can accumulate to several thousand pounds.

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Component 6: Deterioration and dilapidations risk

Commercial buildings in good condition deteriorate meaningfully over a 12-month void. Roofs develop leaks, drainage becomes blocked, decorations become dated, M&E plant sits idle. A building handed over to a new tenant after a 12-month void will typically need more incentives (a longer rent-free period, a higher landlord fit-out contribution) to let than the same building let immediately after the previous tenant vacated.

The longer the void, the more you may need to spend to make the building attractive to the next tenant. This cost is speculative but real — a building that would have let with a 3-month rent-free in month one may need 6 months rent-free and £30,000 of redecoration in month 12.

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The total cost: an example calculation

A commercial office unit with a rateable value of £40,000, capable of generating £30,000 per year in rent, has been vacant for 12 months.

The true cost of this void is not £30,000 of lost rent — it is over £52,000 when all components are included. Each additional month the property remains vacant costs approximately £4,400.

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What this means for how quickly you need to act

These numbers change the calculation about incentives. A landlord considering whether to offer a 3-month rent-free period to attract a good tenant should compare that cost (£7,500 on a £30,000 per year rent) against the alternative: £4,400 per month of void costs while they wait for a better offer. After less than two months of additional vacancy, the incentive has paid for itself.

This is why experienced commercial landlords take a different view of incentives than the headline rent suggests. The question is not "what will I lose by offering a rent-free period?" but "what will I lose if I don't fill this unit quickly?"

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Frequently Asked Questions

When do empty commercial property rates start?

<cite index="18-1">Most commercial uses get three months of empty property relief. Industrial and warehouse properties get six months. After that, the owner pays full rates until the unit is occupied again.</cite> The initial relief period begins on the date the property becomes vacant and the owner notifies the local billing authority.

Can I avoid empty rates by putting someone in the property temporarily?

<cite index="16-1">From 2025, landlords must now show 13 weeks of continuous occupation before a new period of relief can begin.</cite> The previous strategy of brief occupation to reset the relief clock is significantly less effective. HMRC and local authorities are alert to artificial occupation arrangements and can challenge them.

What is the fastest way to fill a commercial void?

The fastest way to fill a commercial void is to put your available property in front of active occupiers who have already described what they need — rather than waiting for portal enquiries from general browsers. RE:match gives you access to businesses that have posted specific requirements matching your location and property type, allowing you to respond directly with your available space.

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RE:match gives landlords and agents direct access to active occupier requirements — businesses that have already described exactly what they need. Browse live requirements and respond directly at rematch.co.uk.