The Hidden Costs Every Landlord Should Budget For

Ask most landlords what their costs are and they'll mention the mortgage, maybe insurance. Then they're surprised when their "profitable" property barely breaks even.

The gap between what landlords think they earn and what they actually take home can be pretty shocking. It's not because the property is bad. It's because the full cost picture was never properly calculated in the first place.

In this post, we'll walk through every cost you need to budget for, why each one matters, and how much they'll realistically set you back.

The Costs Everyone Knows About

Let's start with the obvious ones. Not because you'll forget them, but because even these are often underestimated.

Mortgage Payments

Your single biggest expense. But the number you see on your mortgage offer isn't the end of the story. Remember:

• Product fees (£500-2,000) are often added to the loan, increasing your balance
• Stress test rates can force you into a higher rate product than you'd otherwise choose
• Rate changes at remortgage can dramatically alter your cash flow

A property that cash flows at 4.5% may not at 6%. Always model your numbers at both current and stressed rates.

Landlord Insurance

Buildings insurance is the minimum, but comprehensive landlord insurance should also cover:

• Landlord liability (if a tenant or visitor is injured)
• Loss of rent (if the property becomes uninhabitable)
• Contents insurance (if you're letting furnished)
• Legal expenses cover (for disputes and eviction proceedings)

Budget £200-500 per year depending on property type and cover level. Don't just default to the cheapest quote. An uncovered claim will cost you far more.

The Costs Landlords Underestimate

This is where things start to bite. These expenses are known in theory but consistently underbudgeted in practice.

Void Periods

No tenant means no rent, but your mortgage, insurance, and council tax bills don't stop. A single month void on a property earning £1,000/month doesn't just cost you £1,000. It costs you £1,000 plus the council tax you now have to pay, plus any utilities you need to keep running.

Realistic budget: Allow for 4-8% of annual rent as void allowance. That's roughly 2-4 weeks per year. If your property is in an area with weaker demand or targets a niche market, budget higher.

Maintenance and Repairs

The "10% rule" (setting aside 10% of rent for maintenance) is a reasonable starting point for modern properties. For older stock, it's not enough.

Here's what the big-ticket items actually cost in 2026: