By the Lapera Insurance Team · Reviewed by Joe Lapera, Licensed Illinois Insurance Agent (IL Lic #100722394)
You are buying a greystone two-flat, or you just moved out of the owner's unit in your frame three-flat, and nobody can give you a straight answer on what the policy should be. The short version: it depends on whether you live there, how many units there are, and what Chicago does to old buildings with garden units, back porches and century-old wiring.
If you live in one unit of a Chicago two-flat, three-flat or four-flat, it is usually insured on a homeowners-type policy that accounts for the rented units. If you live elsewhere, it goes on a landlord (dwelling) policy such as a DP-3, with loss of rents and landlord liability. At five or more units, most carriers move to a commercial program. In Chicago, also plan for sewer backup and ordinance or law coverage.
Most insurance advice is written for single-family houses. A Chicago multi-flat is different: the owner is often also a neighbor, the building is often older than anyone living in it, and the lowest unit sits partly below a street served by a combined sewer. Each of those facts changes the policy, so we take them one at a time.
What Policy Does a Chicago Two-Flat, Three-Flat or Four-Flat Need?
TL;DR: Living in one unit usually means a homeowners-type policy, renting every unit means a landlord dwelling form like a DP-3, and five or more units usually means a commercial policy.
The question that decides the form is whether you live in the building. If you occupy one unit, it is your home: the policy covers your belongings and your living costs if a fire forces you out, and it must also account for the rented units, because rental income and tenant liability are exposures the carrier underwrites.
If you live elsewhere, the building is an investment property, and it belongs on a landlord or dwelling fire policy, most often a DP-3, covering the structure, your liability as a landlord and the rent you lose during repairs. Our Illinois landlord insurance guide explains the DP-1, DP-2 and DP-3 forms and how loss of rent pays.
| Your situation | Policy that usually fits | What to watch |
|---|---|---|
| You live in one unit of a 2 to 4 unit building | Homeowners-type policy written for an owner-occupied multi-family, or a dwelling form with owner occupancy, depending on the carrier | Confirm the rented units, rental income and tenant liability are all declared |
| You live elsewhere and rent every unit | Landlord dwelling policy such as a DP-3 | Loss of rents, landlord liability and water backup are the pieces people skip |
| Building vacant or under gut rehab | Vacancy or renovation coverage | Standard forms restrict some losses after a stated vacancy period, and Chicago has its own vacant building rules |
| Five or more units | Usually not a personal policy | Most carriers move these to a commercial apartment program |
| Your tenants' belongings | Never on your policy | Tenants need their own renters insurance |
Why the line at four units? Personal insurance tends to follow the same boundary that federal housing programs draw. Fannie Mae buys mortgages on residential properties of one to four units (Fannie Mae Selling Guide B2-3-01, September 2025). FEMA's flood program classifies a 2-4 family building separately from an "other residential" building designed for five or more families (FloodSmart glossary). Carriers vary, so treat the table as the usual pattern, not a rule.
Lapera Insurance Agency is a Farmers Insurance agency at 530 Barron Blvd in Grayslake, Illinois. Our team has insured Illinois homes and rental property since 1993, with over 40 years of combined experience. Our office is in Lake County, not the city, so we work with Chicago building owners by phone and email. Every guide on this site is reviewed by a licensed Illinois agent before it publishes.
Why Are Chicago Two-Flats and Three-Flats Different to Insure?
TL;DR: They are old, they are everywhere, and their construction details, like garden units, wood back porches and shared boilers, are exactly what carriers ask about.
Two-to-four unit buildings are the backbone of Chicago housing. DePaul University's Institute for Housing Studies found that units in 2 to 4 unit properties made up 26 percent of Chicago's housing stock as of 2020, and that roughly 54 percent of those buildings carried a homeowner exemption in tax year 2019, meaning they were presumed owner-occupied (Institute for Housing Studies, May 2021). The same institute reports these buildings held just over 32 percent of the city's rental units in 2021 (IHS State of Rental Housing, June 2023).
A century-old building has been rewired, re-plumbed and re-roofed at different times by different owners, and carriers price and accept it based on those updates.
Greystone and brick
Masonry fronts are durable, but the interior systems behind them may date from several eras. Carriers want the years for the roof, electrical, plumbing and heating updates.
Frame two-flats
Construction type is a core rating factor. A wood-frame building is rated differently from masonry, and replacement cost has to reflect Chicago labor and material prices.
Garden units
A partly below-grade unit is the first place water shows up. It changes how sewer backup and flood coverage respond, covered in its own section below.
Wood back porches
The classic rear porch is a liability exposure and a City inspection item. Its condition matters to carriers and to anyone who could be hurt on it.
Shared boilers
One heating plant serving every unit means one failure can freeze pipes in all of them, and the City's heat ordinance puts the duty to keep units warm on the landlord.
Detached garages
A garage on the alley counts as an other structure. The default limit on many policies is a small percentage of the dwelling limit, which may not rebuild it.
Market value and rebuild cost on a 1910 greystone can be far apart in either direction, which our replacement cost vs. market value guide explains.
Does the Chicago Landlord and Tenant Ordinance Apply to Your Building?
TL;DR: Not while you live there, because the RLTO excludes owner-occupied buildings of six units or fewer, but the day you move out it applies, including tenant rights after a fire that directly affect your rent.
Chicago's Residential Landlord and Tenant Ordinance (RLTO) sets the rules for most rental housing in the city. Section 5-12-020 of the Municipal Code excludes "dwelling units in owner-occupied premises containing six units or fewer," although its lockout protections and its notice rules for ending or not renewing a lease still apply (Chicago Municipal Code 5-12-020). So an owner living in a two-flat, three-flat or four-flat is outside most of the RLTO. Move out, and the same building falls under it.
That matters for insurance because of what the RLTO says about fire and casualty. Under Section 5-12-110(g), if fire or another casualty damages a unit badly enough, the tenant may immediately move out and give written notice within 14 days, in which case the lease ends as of the date of the fire. A tenant who can lawfully stay in part of the unit may do so, with rent reduced in proportion to the lost rental value. Those remedies are not available if the tenant or their guests caused the damage deliberately or negligently (Chicago Municipal Code 5-12-110; City of Chicago RLTO summary, December 2023).
In plain terms: after a kitchen fire in a non-owner-occupied three-flat, the rent from that unit can stop the same day, and you may be re-leasing it after repairs. That is the income loss of rents coverage replaces, which is why we treat it as essential on a Chicago rental.
The day you move out and rent your old unit, the building likely needs a different policy form, and the RLTO starts to apply. Call your agent before the new lease starts, and read the City's RLTO page, since covered landlords must give tenants the City's ordinance summary and follow its security deposit rules. This guide is general information, not legal advice.
What Happens When Water Gets Into the Garden Unit?
TL;DR: Water backing up through a floor drain is sewer backup, which needs its own endorsement, while outside water rising into the unit is flood, which needs a flood policy with limited basement coverage.
The City's Department of Water Management explains that during intense storms, "sewer mains fill up, and additional water pushes into basements," across a system with roughly 4,400 miles of sewer main (Chicago Department of Water Management). The Metropolitan Water Reclamation District notes that most sewers in the Chicago area are combined, carrying sanitary sewage and rainwater in the same pipes (MWRD). When the pipes surcharge, the lowest drain in the building is where the water comes out, and in a two-flat or three-flat that is often the garden unit.
It is not hypothetical. The National Weather Service Chicago office documented the July 2, 2023 storm, which dropped an estimated 9.1 inches near the border of Chicago, Cicero and Oak Park, left more than 10,000 homes in Chicago, Cicero and Oak Park with flood-related damage, with most flooding confined to roadways and basements, and filled the deep tunnel and McCook Reservoir (NWS Chicago event summary, November 2023). Statewide, the Illinois Department of Natural Resources found 85.2 percent of urban flooding payouts from 2007 to 2014 were in the six-county Chicago metro area, and over 90 percent of urban flooding damage claims were outside the mapped floodplain (IDNR Urban Flooding Awareness Act report, 2015).
- Sewer or drain backup: water coming up through a floor drain, toilet or failed sump. Most policies offer limited or no coverage unless you add a backup endorsement (NAIC consumer guide, 2022). Size it to what the garden unit costs to rebuild.
- Flood: surface water entering from outside. Standard homeowners and landlord policies exclude flood. FEMA's flood program insures a 2-4 family building for up to $250,000 of building coverage (NFIP guide, November 2022).
- Many garden units count as basements for flood. FEMA defines a basement as any area with its floor below ground level on all sides, and NFIP coverage there excludes finished walls, finished flooring and most belongings, while covering items like furnaces and water heaters and, under contents coverage, washers, dryers and food freezers (FEMA basement fact sheet, January 2022).
- Tenant belongings are never yours to insure. The garden-unit tenant's furniture is covered only by their own renters policy, and only if it includes backup coverage.
An owner lives on the second floor of a frame three-flat and rents the other two units. An overnight storm pushes sewer water up the garden unit's floor drain. Illustrative figures: drywall, flooring, cabinets and the water heater come to about $32,000. With a $10,000 water backup endorsement, the owner pays roughly $22,000 plus the deductible out of pocket; with a backup limit sized to the build-out, the endorsement pays the repair after the deductible. Whether three months of lost garden-unit rent is paid depends on how the endorsement is written, and the tenant's $12,000 of belongings is covered only by the tenant's renters policy. Figures are illustrative, not a quote or a coverage determination.
For a Chicago multi-flat, the practical order is a water backup endorsement sized to the garden unit first, then a flood conversation if the building sits low or has flooded before. Our Illinois flood insurance guide covers the rest.
Will Your Policy Pay to Bring a 100-Year-Old Building Up to Code?
TL;DR: Not unless you carry ordinance or law coverage, which pays the extra cost of rebuilding to current code after a covered loss.
A standard property policy pays to repair what you had. It does not automatically pay the extra cost when the City requires the repair to meet today's code. The NAIC describes an ordinance or law endorsement as paying "for the extra expense to rebuild your home in compliance with building codes and other ordinances or laws that didn't exist when your home was originally built" (NAIC Consumer's Guide to Home Insurance, 2022).
In Chicago that gap is real. The City modernized its construction codes on the International Code Council model codes, with the new Chicago Building Code mandatory for permit applications started on or after August 1, 2020 (City of Chicago Department of Buildings). Under the Chicago Building Rehabilitation Code, as the Department of Buildings summarized it in 2022 training materials, where load-carrying elements suffer substantial structural damage, the structure must be upgraded to meet current loading requirements (Chicago DOB, 2022). On a 1910s building, a serious fire can trigger upgrades the repair estimate never included.
- Ask for ordinance or law coverage by name, and ask what limit applies. It is often a percentage of the dwelling limit.
- Check the three parts: loss to the undamaged portion that must be torn down, demolition cost, and the increased cost of construction.
- Tell your carrier what has been updated. Electrical service, plumbing, roof and heating updates affect both eligibility and price.
How Much Liability Does a Chicago Multi-Flat Owner Need?
TL;DR: More than the default, because tenants and their guests use your stairs, porches and common areas every day, and an umbrella above the building policy is the efficient way to get there.
The Insurance Information Institute notes that a landlord policy's liability coverage responds if "a tenant or one of their guests gets hurt on the property" (III). In a multi-flat, the classic Chicago exposures are shared: the back stairs, the rear porch, the gangway, the basement laundry and the sidewalk out front.
- Back porches. The City's Department of Buildings says porch and deck structures must support 100 pounds per square foot of live load, and structural repairs need a permit with plans from an architect or engineer (Chicago DOB porch and deck safety). The Department has also reminded owners that they "are required by law to make necessary repairs and maintain their property in a safe condition" (DOB, May 2014).
- Heat. Where tenants do not control their own heat, Chicago requires landlords to keep units at least 68 degrees from 8:30 a.m. to 10:30 p.m. and 66 degrees overnight from September 15 through June 1, with fines up to $1,000 per day per violation (Chicago Heat Ordinance). A January boiler failure is a tenant, frozen-pipe and code problem at once, so ask whether equipment breakdown coverage is available.
- Lead paint disclosure. Landlords of pre-1978 housing, which describes most Chicago multi-flats, must disclose known lead-based paint hazards, give tenants the EPA pamphlet and keep signed disclosures for three years (U.S. EPA).
- Umbrella coverage. A personal umbrella can sit above your building policy and your auto policy together. Confirm it schedules the rental units. Our Illinois personal umbrella guide walks through how that works.
Your tenants should carry their own coverage too. The III notes that many landlords require tenants to buy renters insurance before signing a lease, to avoid disputes over damage to the tenant's belongings (III). Point prospective tenants to our Illinois renters insurance guide, and have your attorney confirm the lease language fits the RLTO if it applies to your building.
What Changes When the Building Is Vacant, Under Rehab or Adding a Unit?
TL;DR: A fully vacant Chicago building triggers City registration and a liability insurance minimum, and adding a garden or attic unit can change which policy the building qualifies for.
If you buy a multi-flat to rehab and the whole building sits empty, Chicago's vacant building ordinance applies. Owners must register within 30 days after the building becomes vacant or after taking ownership, whichever is later, and must carry liability insurance of not less than $300,000 per occurrence for a residential building (Chicago Municipal Code 13-12-125). The Department of Buildings adds that registration must be renewed every six months until the building is deregistered (DOB vacant building owner requirements, revised December 2021).
Most property policies also restrict some losses, such as vandalism, after a stated vacancy period, and a gut rehab needs coverage written for renovation. Tell your agent before the last tenant leaves.
Adding a unit is the other big change. Chicago's Additional Dwelling Unit ordinance, approved by City Council in December 2020, allows new conversion units in basements and attics and coach houses in rear yards, with owner-occupancy rules in some zones (Chicago Department of Housing), and the City approved a citywide expansion in September 2025 (City of Chicago). On a four-flat, a fifth unit can move the building out of personal lines entirely, so talk to us before construction starts.
Lenders want proof of insurance before closing, and older Chicago buildings get more underwriting questions. Get the inspection report, system ages and current leases early, so the quote reflects the real building.
What Do You Need to Get a Quote on a Chicago Two-to-Four Flat?
TL;DR: The address, the number of units and who lives in them, the building's system updates, the rents and leases, and your current declarations page if the building is already insured.
Our office is in Grayslake, so we quote and service Chicago buildings by phone and email. Most of what we need fits on one page:
- Address, year built and construction type (masonry, frame or mixed), plus square footage if you have it.
- Units and occupancy: how many units, which one you live in if any, and whether any unit is vacant.
- Updates: the years for the roof, electrical service, plumbing and heating, and whether the rear porch has been rebuilt.
- Water history: any past backup or flooding, and whether there is a backflow device or sump.
- Rents and leases: monthly rent per unit, so loss of rents is sized correctly.
- Your current declarations page, so we can see what form and limits you have today.
We place Chicago multi-flats with Farmers and the Farmers family of carriers, plus additional markets. Farmers, for example, lists loss of rents, landlord liability and personal injury coverage for claims such as wrongful eviction among its landlord options, with availability varying by property (Farmers landlord insurance). If you live in the building, ask about combining the building with your auto policy. Our guides to bundling home and auto in Illinois and Illinois home insurance discounts explain what carriers commonly offer. You can start on our landlord insurance page or request a quote directly.
The Bottom Line
A Chicago two-flat, three-flat or four-flat is insured based on one question first: do you live there? If you do, it is usually a homeowners-type policy that also accounts for the rented units. If you do not, it is a landlord dwelling policy with loss of rents and landlord liability. Five or more units usually means a commercial program. Then the Chicago details decide whether it works: a backup limit sized to the garden unit, ordinance or law coverage for a century-old building, and liability limits that reflect how many people use your stairs and porches.
If you are buying a multi-flat, just moved out of the owner's unit, or have never had anyone review the policy on an older Chicago building, send us the address and your current declarations page. Our Grayslake team will tell you which form you are on, what it would pay after a storm or fire, and what it would take to close the gaps.
Related Questions
Can I get homeowners insurance on a two-flat I live in?
Usually, yes. When you live in one unit of a two-to-four unit building, many carriers write it on a homeowners-type policy that covers the building, your belongings, your living costs after a covered loss and your liability, while accounting for the rented units. Some carriers use a dwelling form with owner occupancy instead, so underwriting varies. Always declare the rented units.
Does the Chicago RLTO apply to owner-occupied two-flats?
No, for most purposes. Chicago Municipal Code 5-12-020 excludes dwelling units in owner-occupied buildings with six units or fewer from the Residential Landlord and Tenant Ordinance, although its lockout protections and its notice rules for ending or not renewing a lease still apply. If you move out and rent every unit, the RLTO applies, including its security deposit rules and tenant remedies after fire or casualty damage.
Does landlord insurance cover a flooded garden unit in Chicago?
Only partly, and it depends on the water. Sewer or drain backup is covered only with a water backup endorsement. Standard landlord and homeowners policies exclude flood, so surface flooding needs flood insurance, and FEMA treats a unit with its floor below ground on all sides as a basement, where NFIP coverage for finished walls, floors and most belongings is excluded.
Is a four-flat insured differently than a two-flat?
Often, yes. Both fall within the one-to-four unit range that most personal property programs cover, but three- and four-unit buildings typically get more underwriting questions about updates, occupancy and liability. At five or more units, most carriers move the building to a commercial apartment program, and FEMA classifies it as an other residential building for flood.
What insurance does a vacant building in Chicago need?
If the whole building is vacant more than 30 days, Chicago requires the owner to register it with the Department of Buildings and carry liability insurance of at least $300,000 per occurrence for a residential building. Property coverage also needs attention, because most policies restrict some losses after a stated vacancy period, and a rehab needs coverage written for renovation.
Do Chicago multi-flat owners need ordinance or law coverage?
It is strongly worth considering. Ordinance or law coverage pays the extra cost of rebuilding to current code after a covered loss. With Chicago's 2 to 4 unit stock having a median age over 100 years, and City rules requiring upgrades after substantial structural damage, a standard repair payment can fall short without it.
Last reviewed September 2026 by Joe Lapera, Licensed Illinois Insurance Agent (IL Lic #100722394). Figures verified against the sources linked above on that date.