Four rules of thumb, a worked example for a $250,000 rental, and how to turn them into a monthly number.
A common starting point is to budget about 1% of the home's value per year for maintenance, or roughly $1 per square foot, then add a separate reserve for big replacements like the roof, water heater and HVAC. For a $250,000 rental, that often lands near $3,000–$4,000 a year. These are rules of thumb, so adjust for age and condition.
Underbudgeting is how a good rental turns into a bad month: the water heater fails, the cash isn't there and the decision gets made under pressure. A rough number set in advance is better than an exact number you never calculate. Here are the common rules and how they fit together.
| Rule | How it works | Best for |
|---|---|---|
| 1% rule | Set aside about 1% of the property's value each year for maintenance and repairs | Quick estimate on a typical home |
| $1 per square foot | About $1 per square foot of living space per year | Sanity check; easy to compute |
| 50% rule | Operating expenses (taxes, insurance, maintenance, vacancy and more, but not the mortgage) tend to run about half of rent | Judging a deal as a whole, not maintenance alone |
| Capital reserve | For each major item, divide replacement cost by typical life and set that amount aside each year | Older homes and big-ticket items |
Take a 1,500 square foot house worth $250,000. All numbers here are illustrative; swap in your own quotes and ages.
The two rules bracket a range of $1,500 to $2,500. An older home or one with deferred maintenance belongs at the top or beyond.
Now add the big items. Using commonly cited life spans (a range, so the midpoint is used):
| Item | Replacement cost (illustrative) | Typical life | Set aside per year |
|---|---|---|---|
| Water heater | $1,500 | 10 years | $150 |
| Furnace | $6,000 | 15–20 years (17.5) | $343 |
| Central air | $5,500 | 10–15 years (12.5) | $440 |
| Refrigerator | $1,200 | 10–15 years (12.5) | $96 |
| Dishwasher | $700 | 10 years | $70 |
| Total | about $1,099 |
Add that to the $2,500 routine figure and you land near $3,600 a year, or about $300 a month, as a conservative budget. Those capital funds are meant to accumulate in an account until needed, not be spent each year. Roofs, flooring, exterior paint and plumbing can be added the same way.
Use the 1% rule as a ceiling for routine costs, then add the capital reserve. If you are buying, factor the age of the systems into the price and the reserve.
Set up a transfer into a separate savings account, such as $300 a month in the example. It makes the big repair a withdrawal, not a crisis.
Record each repair against the property. After a year, compare to the budget and adjust. Real history beats any rule.
Decide in advance how much a vendor may spend before checking with you. See What a Good Maintenance Action Plan Looks Like.
When a quote comes in, the repair or replace calculator and the decision framework help you decide whether to spend reserve money on a fix or a new unit.
Many managers charge a percentage of rent plus fees for coordinating repairs, and the maintenance costs themselves are separate. If you're comparing options, how much a property manager costs for one rental property breaks down the typical fees.
Guardian Landlord won't set your budget, but it helps you see where the money actually goes. Each request stays in the property's history, and expense reporting tracks costs, so you can see the real total spent on an aging item and compare it with your reserve. The AI action plan gives you suggested vendors from your own list and a pre-drafted message, which you review and approve. Plans start at $9 a month for one property, with a free 3-month trial.
A common starting point is about 1% of the property's value per year, or around $1 per square foot, plus a separate reserve for major replacements. Older homes need more. Adjust after you see a year of real expenses.
It is a rule of thumb that operating expenses, such as taxes, insurance, maintenance and vacancy but not the mortgage, run about half of rental income. It is a way to evaluate a deal, not a maintenance budget.
For each major system, divide its replacement cost by its expected life in years and add up the results. For example, a $1,500 water heater with a 10-year life needs $150 a year. Actual lifespans vary, so treat the number as an estimate.
Guardian Landlord keeps a request history for every property and tracks expenses, so your budget can be based on real numbers. Try it free for 3 months.
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