Two Denver duplexes can sit three blocks apart, carry the same purchase price, collect the same rent, and still hand their owners cash flow that differs by more than a thousand dollars a year. One of the biggest reasons is the insurance line, and most pro formas still carry a placeholder somebody typed in years ago and never revisited.
By the end of this post you will know what the State of Colorado’s own data says about why Denver rental property insurance costs what it does, how to build the insurance line in a pro forma instead of guessing at it, and exactly what a realistic premium does to cash-on-cash return on a deal that otherwise pencils.
Why Denver rental property insurance costs what it does
In February 2026 the Colorado Division of Insurance published an analysis built from data it collected from 20 homeowners insurers representing about 80 percent of the state’s market premium, broken out across 11 counties. It is the clearest public look at what Colorado homeowners are actually paying for, and it is not what most investors assume.
For Denver, the Division reported an average annual premium of $3,040. Of that, $1,547 was attributed to hail risk and about $30 to wildfire risk. Statewide, the Division found hail accounts for 26 to 54 percent of total homeowners premium depending on the county, while wildfire accounts for 0.9 to 24.6 percent.
Read that again. In Denver, roughly half the premium is hail. Wildfire, the risk that gets the headlines and the legislative attention, is about one percent of a Denver premium. If you have been underwriting Denver deals with a wildfire story in your head and a flat insurance number in your spreadsheet, you have the risk backwards and the cost understated.
One honest caveat. The Division’s figures cover owner-occupied homeowners policies, not landlord dwelling policies, which price differently. But the hail that lands on the roof does not care who sleeps under it. Treat the county figure as an anchor, not as your quote.
How to model the insurance line instead of guessing
The insurance line in a rental pro forma is not one number. It is four, and collapsing them into a single placeholder is how deals get mispriced.
Modeled Annual Insurance = Base Dwelling Premium + Loss of Rents Coverage + Liability Umbrella Share + Deductible Reserve Allocation
Base dwelling premium. What the carrier charges to cover the structure at replacement cost. This is the number a broker quotes you, and it is the only one most investors model.
Loss of rents coverage. Pays the rent while a damaged unit is uninhabitable. On a Denver property with a hail-exposed roof this is not optional coverage, it is the coverage that keeps a claim from also being a vacancy event.
Liability umbrella share. If you carry an umbrella across a portfolio, allocate a per-property share of it rather than leaving it off the property pro forma and out of your returns.
Deductible reserve allocation. Ask whether your wind and hail deductible is a flat dollar amount or a percentage of dwelling coverage, and whether the roof settles at replacement cost or actual cash value. On a $450,000 dwelling limit, a two percent hail deductible is $9,000 out of your pocket before the carrier pays anything. That is a reserve line, and it belongs in the model.
Worked example: a Denver duplex at two insurance assumptions
Same property, same rent, same loan. The only thing that changes is the insurance number. Property taxes, rate, and reserve percentages below are assumptions for illustration; use your own quote and your own assessor figure.
- Purchase price: $560,000
- Down payment, 30 percent: $168,000
- Loan: $392,000 at 6.75 percent over 30 years
- Closing costs, 2 percent: $11,200
- Initial repairs: $6,000
- Total cash invested: $185,200
- Rent: two units at $2,050, so $4,100 per month, or $49,200 per year
- Vacancy, 5 percent: $2,460
- Effective gross income: $46,740
- Property taxes: $3,100
- Maintenance, 7 percent of gross rent: $3,444
- Capital reserves, 5 percent of gross rent: $2,460
- Self-managed, so no management fee
- Annual debt service: $30,510
Scenario A uses a $1,900 insurance placeholder, the kind of number that still shows up in template spreadsheets. Operating expenses total $10,904. Net operating income is $46,740 minus $10,904, or $35,836. Cash flow is $35,836 minus $30,510, or $5,326 per year. Cash-on-cash return is $5,326 divided by $185,200, or 2.88 percent. Cap rate is 6.40 percent.
Scenario B uses $3,040, the Denver average from the Division of Insurance. Operating expenses total $12,044. Net operating income is $46,740 minus $12,044, or $34,696. Cash flow is $34,696 minus $30,510, or $4,186 per year. Cash-on-cash return is $4,186 divided by $185,200, or 2.26 percent.
A difference of $1,140 on one expense line erased 21 percent of the annual cash flow and took 62 basis points off the cash-on-cash return. The property did not change. The accuracy of one assumption did. This is the same arithmetic we walk through in our guide to calculating cash-on-cash return, and the insurance line is the one that most often makes the published number wrong.
What counts as a reasonable Denver insurance assumption
There is no single correct number, and anyone who hands you one without asking about your roof is guessing. What the premium actually turns on:
Roof age, material, and impact rating. This is the dominant variable in a hail market. The Division’s analysis estimated that hail mitigation, including fortified roofs, was worth between $82 and $387 per year in average premium savings across the counties it studied. That is real money, but it is not the whole story. A newer impact-rated roof also changes whether a carrier will write the risk at all.
Settlement basis. Replacement cost on the roof costs more in premium and pays more at claim time. Actual cash value looks cheaper every month and can leave you funding most of a roof yourself.
Deductible structure. A higher or percentage-based hail deductible buys down the premium and raises the reserve you need to hold. One is an income statement item and the other is a balance sheet item. Model both.
Unit count and policy form. A two to four unit property, a single family rental, and a short-term rental are three different underwriting conversations with three different price points.
Practically, for a Denver long-term rental in 2026, build the model at the county anchor or above it, then replace that anchor with a real quote before you go hard on earnest money. Do not model below it and hope.
6 mistakes Denver landlords make on the insurance line
- Using the seller’s current premium. Their policy reflects their claims history, their deductible, and sometimes a legacy rate the carrier will not offer you. Fix: get your own quote using the actual roof age and dwelling limit before closing.
- Modeling the premium flat for ten years. A static insurance line in a ten-year projection is a modeling error, not a forecast. Fix: escalate insurance at a higher rate than your other operating expenses, and run a sensitivity case at one and a half times your quote.
- Leaving loss of rents out. A hail claim that takes a unit offline for two months is a repair cost and a revenue hole. Fix: confirm the loss of rents limit and the waiting period, and carry the coverage in the premium you model.
- Ignoring the deductible in the reserve plan. A percentage-of-coverage hail deductible can run five figures on a Denver duplex. Fix: hold the full deductible in cash as a named reserve, separate from your maintenance reserve.
- Treating insurance as a fixed cost you cannot influence. You can, through roof decisions, deductible structure, and bundling. Fix: price out an impact-rated roof as a capital expenditure with a premium savings return, not just as a repair.
- Underwriting insurance without underwriting property taxes in the same pass. These are the two Denver expense lines that move independently of your rent, and they move together in a bad year. Fix: build both from local data at the same time. We walk through the local tax side in how Denver rental property tax math works.
Your insurance underwriting checklist
- Pull the roof’s installation year and material from the seller’s disclosure or the county records.
- Get a written landlord policy quote at your intended dwelling limit, not a lender estimate.
- Confirm in writing whether the roof settles at replacement cost or actual cash value.
- Write down the wind and hail deductible in dollars, not as a percentage, and fund it as a reserve.
- Add loss of rents coverage and note the limit and waiting period.
- Allocate a share of your umbrella policy to this property.
- Rerun your cash-on-cash return and your debt service coverage ratio at the quoted premium and at one and a half times the quoted premium. If the deal only works at the lower number, it is not a deal.
Where this fits in the rest of the underwriting
Insurance is one expense line, and fixing it alone will not fix a pro forma that is loose everywhere else. For the full sequence, start with our complete guide to rental property analysis, then confirm you are tracking the seven numbers every rental analysis needs. When you compare Denver deals against out-of-state ones, the cap rate math is where the insurance difference shows up first, because it hits net operating income directly.
Our free calculators will get you a first pass in about ten minutes. If you want someone to pressure test a specific Denver deal or your whole portfolio model, that is what our Denver fractional CFO work is for. You can book a free 20-minute consult and bring the spreadsheet you are already using.
A thousand dollars a year is not a rounding error on a duplex. It is the difference between a property that funds its own reserves and one that quietly asks you for money every January. The number is knowable. Go get it.
Sources: Colorado Division of Insurance, hail and wildfire premium analysis, and the Division’s February 2026 announcement of those findings.
Simply Spreadsheets helps real estate investors and small business owners make confident decisions with clean, reliable numbers. Founded by Erin Onsager, a fractional CFO with more than 20 years of finance experience, the firm builds custom spreadsheets, financial models, and analysis that turn raw data into clear answers.
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