Underwriting

How to underwrite a property with unusually high utility bills

Unusually high utility bills on a property can signal hidden issues like poor insulation, leaky plumbing, or outdated systems. Factor these potential problems into your underwriting to accurately assess the true cost of ownership and necessary repairs.

October 31, 2026 · 3 min read

What high utility bills can indicate about a property

When a property has unusually high utility bills, it is often a symptom of underlying problems that will affect its value and your repair budget. Common culprits include an inefficient HVAC system, poor insulation in the attic or walls, drafty windows and doors, or even plumbing leaks that are constantly running water.

These issues represent deferred maintenance or outdated components that you will likely need to address. Ignoring them means the next owner will face the same high costs, making the property less desirable for a retail buyer or a renter.

Asking the seller about utility history

During your initial conversations, politely ask the seller about the property's utility costs. You can frame it as, "Could you give me an idea of what the average monthly utility bills typically run? I am trying to get a complete picture of the property's operational costs."

His or her response can be very telling. If the seller is evasive or dismissive, it might be a red flag. If he or she provides specifics, it gives you a starting point for your investigation. Remember this is not legal or financial advice; consult with professionals for your specific situation.

Reviewing past utility bills for patterns

If the seller is willing, ask to see copies of the last 12-24 months of utility bills. This provides an objective look at usage patterns and costs. Look for spikes that do not align with seasonal changes or consistently high consumption that suggests a systemic issue.

A steady high bill, even in mild weather, points to a constant drain on resources, like a running toilet or a perpetually leaky faucet. Compare the property's square footage to average utility usage for similar homes in the area to spot outliers.

Estimating the cost of potential upgrades and repairs

Based on your assessment of the utility bills and your walkthrough, estimate the cost to remediate the most likely causes. This might include budgeting for new insulation, sealing air leaks, upgrading an old HVAC system, or replacing inefficient windows. These are all expenses that will eat into your profit.

Get quotes from contractors for these specific repairs. Do not just guess. A new HVAC system, for example, can be a significant cost, and you need to factor that accurately into your offer. Always overestimate slightly to build in a buffer for unforeseen issues.

Adjusting your offer to account for unknowns

High utility bills introduce an element of risk and uncertainty. Your cash offer should reflect this. If you cannot get clear answers or detailed bills, you might need to build in a larger contingency for potential repairs or reduce your offer to compensate for the unknown costs.

It is better to be conservative in your offer than to inherit a money pit. Explain to the seller that your offer reflects the need to address these potential inefficiencies to make the home marketable and comfortable for a new owner.

Considering a deeper inspection for specific systems

For properties with suspiciously high utility bills, consider bringing in specialists during your due diligence period. An HVAC technician can inspect the heating and cooling system, an energy auditor can pinpoint insulation and air leakage issues, and a plumber can check for hidden leaks.

These specialized inspections cost money, but they can save you from a much larger expense down the road. They provide concrete data to support your repair estimates and give you peace of mind before you commit to the purchase.

Questions people ask

Is it common for sellers to provide utility bills?

It varies. Some sellers are transparent and readily provide them, especially if they are motivated. Others might be hesitant or simply not have them organized. It is always worth asking politely.

What if the seller claims the bills are normal for the area?

Verify this claim. Research average utility costs for similar homes in that specific area. If the seller's bills are significantly higher than the average, press for more details or plan for a more thorough inspection.

Can I get utility records directly from the city or utility company?

Generally, utility companies require the account holder's permission to release past billing information. You usually cannot obtain these records directly without the seller's explicit consent, often in writing.