Houston is a high-volume, high-variance multifamily market. The same Texas property tax dynamics that make DFW underwriting tricky apply here, plus Houston has the most consequential floodplain exposure of any major US multifamily metro (Harvey 2017, Imelda 2019, Tax Day 2016, multiple smaller events), plus a deed-restriction system that does the work zoning does in other cities, plus a heavy MUD presence in the suburbs.
If you're buying multifamily in Houston, four things matter more than the standard checklist.
HCAD reassesses annually, no cap on investment property
Harris County Appraisal District (HCAD) revalues every parcel every year. There's no cap on investment property growth. The 10% homestead cap doesn't apply.
When you close on a Houston property, HCAD pulls the sale price from public records and uses it as their primary comp for next year's assessment. The catch-up is typically year 1 or year 2, not gradual.
Combined millage in Harris County multifamily commonly lands at 2.4-2.8% (county + city of Houston + HISD or another ISD + MUD if applicable). Practical math: model your year-1 tax at purchase price × 2.6% as a placeholder, then refine with the actual jurisdictions on the parcel.
Floodplain matters more here than anywhere else
Houston sits in a flood-prone alluvial plain with poor natural drainage. The FEMA flood maps were redrawn after Harvey and again after Imelda, and the new maps put a significantly larger share of Harris County into Special Flood Hazard Areas than the old ones did.
Three rules for Houston flood underwriting:
Pull the current FEMA map for every address. Properties that were Zone X under the old maps may now be in AE or shaded X. The old maps are not a defense.
Check Harvey water levels, not just FEMA zone. Many properties technically outside the 100-year floodplain still took 2-4 feet of water in Harvey. The Harris County Flood Control District has watershed maps and historical event data. If a property is downstream of an undersized bayou or in a known flooded neighborhood (Meyerland, parts of Bellaire, Greenspoint, parts of Kingwood), it's a higher risk than FEMA alone suggests.
Insurance premiums in AE/AH/AO zones routinely run $5,000-$15,000/year for small multifamily. This is post-Risk Rating 2.0 reality. Get a real quote before bidding. Full guide to FEMA flood zone checks.
MUDs and deed restrictions
Houston has no zoning. Land use is governed by deed restrictions, which can be highly restrictive in some subdivisions and totally absent in others.
Practical effect on multifamily: a parcel might be zoned-equivalent to single-family-only by deed restriction even though the city says you can build anything. Before underwriting any redevelopment angle, check the deed restrictions filed with Harris County Clerk.
For the suburbs (Cinco Ranch, The Woodlands, Sienna, Bridgeland, Cross Creek Ranch, many others), MUDs are nearly universal. A MUD in Houston can add 0.5-1.5% to the combined tax rate. Always check whether the parcel sits in a MUD before underwriting. The Texas Comptroller lists every MUD with its rate.
The Houston Permitting Center
Houston consolidates permits through the Houston Permitting Center. You can look up project status, plan review history, and inspection records by address. Older permits (pre-2011) are sometimes only available on microfilm at the records department.
Cross-reference broker renovation claims against permit records. Houston is a permit-aggressive market (the city has enforced strongly in the post-Harvey rebuilding era), so unpermitted major work is more legally exposed here than in some Texas markets. See the full guide to checking permit history.
Energy market employment cycles
Houston's economy is structurally exposed to oil and gas. Rents, occupancy, and absorption track the energy cycle more than in other Sun Belt markets. When oil prices drop, layoffs in the upstream segment ripple through Class B and C multifamily within 6-12 months.
Two checks worth doing for Houston specifically:
- Tenant employer mix at the property (if available from the seller). Concentrated in energy services or major upstream operators? More cyclical risk.
- Rent direction in the local submarket over the last 5 years. Steady is great. Volatile (up sharply, then down) signals energy-exposure beta.
This doesn't change whether you should buy. It changes how you price the deal.
The standard checklist still applies
The Houston-specific items above sit on top of the general pre-offer due diligence checklist. Permit history, code violations, demographics, debt service stress test, the standard rent roll review all still matter.
Floodplain risk and the deed restriction system are the two items unique enough to Houston that they're worth dedicated time. Everything else is the standard playbook with HCAD's annual reassessment baked in. Full tax modeling guide.
Or get the Houston research done for you
DealBrief pulls HCAD assessment, current millage including MUDs, FEMA flood zone, sale history, permit records, and the full debt service scenario grid for any Houston multifamily address. Tax projection at purchase price built in. Your first report is free.