The Houston Flood & Insurance Checklist

The flood zones, in plain English

• Zone AE: the 1 percent annual chance floodplain, often called the 100-year floodplain, with a mapped base flood elevation. Federally backed lenders require flood insurance here.
• Floodway: the channel and nearby land that carry moving floodwater. Building and remodeling here face the strictest rules.
• Shaded Zone X: the 0.2 percent annual chance floodplain, often called the 500-year floodplain. Flood insurance is usually optional and often wise.
• Unshaded Zone X: mapped as minimal risk. Many Houston homes in this zone have still flooded from heavy local rain and street drainage.

The maps are changing: MAAPnext

Many of Harris County's effective flood maps rely on older rainfall data. The Harris County Flood Control District, working with FEMA, has been updating them through a multi-year effort called MAAPnext, using newer rainfall estimates, better terrain data and improved modeling. Preliminary maps have been released for review, and new maps take effect only after FEMA's formal process is complete.

In general, the updated maps are expected to show larger floodplains in many areas. For any home you are considering, look at both the current effective map and the preliminary map. If a home is likely to move into a mapped floodplain, it can be worth securing a flood policy before the new map takes effect, since lender requirements and pricing can shift once it does.

Elevation certificates

An elevation certificate is a FEMA form completed by a licensed surveyor or engineer. It records the elevation of the home's lowest floor and the surrounding ground, and compares them to the base flood elevation where one exists. It is the clearest single picture of how a house sits relative to mapped risk.

• Ask the seller first. Homes built or elevated in a floodplain since 2018 usually have one.
• Check with the city or county floodplain office, which may have one on file.
• If none exists and the home is near a floodplain, consider ordering one. Cost varies, commonly a few hundred dollars and sometimes more.
• Under FEMA's current NFIP pricing, a certificate is not always required, but it can still support a better premium and help you compare homes honestly.

NFIP or private flood insurance?

Standard homeowners policies do not cover flood. You buy flood coverage separately, from the National Flood Insurance Program or a private carrier. Since FEMA's Risk Rating 2.0, NFIP premiums are based on property-specific factors like distance to water, elevation, foundation type and rebuilding cost, rather than the zone alone.

What the Seller's Disclosure must tell you

Since 2019, Texas has required the Seller's Disclosure to address flood risk directly. Read these answers closely and ask follow-up questions about anything marked yes. A past claim is not automatically disqualifying, especially if the home was elevated or rebuilt, but you need to know what happened and what changed.

• Is the property in a 100-year floodplain, a 500-year floodplain, a floodway or a reservoir area?
• Has the home flooded, and has water ever entered the structure?
• Has the seller ever filed a flood insurance claim?
• Has the seller received federal disaster assistance for flood damage?
• Does the seller currently carry flood insurance?

One gap to know: a brand-new home that has never been occupied is generally exempt from the standard Seller's Disclosure. On new construction, ask the builder directly for the survey, the drainage plan, the elevation certificate and the finished floor height.

White Oak Bayou: Oak Forest, Timbergrove and the Heights

In the neighborhoods I work in most, White Oak Bayou is the waterway that matters. It runs from northwest Harris County through the Oak Forest and Timbergrove area toward the Heights and downtown. Lower-lying streets near the bayou and its tributaries took water in 2015, 2016 and 2017, while higher ground a few blocks away stayed dry. The Flood Control District has invested in channel improvements and detention along the bayou, and many newer homes in Timbergrove and Oak Forest sit well above the originals they replaced. Today, elevation is one of the clearest price signals between neighboring homes.

Windstorm, hail and your homeowners policy

Inside the Loop and across most of Harris County, wind and hail are covered by your regular homeowners policy rather than the coastal windstorm pool. Many policies carry a separate wind and hail deductible, often written as a percentage of your dwelling coverage, so a 2 percent deductible on a $600,000 dwelling limit is $12,000 out of pocket. Read that line before you sign.

• Roof age drives price and coverage. Some carriers surcharge older roofs or settle them at actual cash value instead of replacement cost.
• Impact-resistant roofing can earn a discount with many carriers. Ask before you replace a roof.
• Claims history follows the address. Ask your insurance agent to check prior claims on the property during the option period.
• Older electrical panels, galvanized plumbing and unpermitted additions can limit which carriers will write a policy.

Budgeting insurance into an offer

Compare homes on total monthly cost, not price alone. Add principal and interest, property taxes, homeowners insurance, flood insurance and any HOA dues, then compare that number across your top choices.

Your 20-item checklist

Handled this way, flood and insurance risk becomes one more piece of information in a good decision. If you are looking at a specific address and want a second opinion on what you are seeing, call or text me. I would much rather you know exactly what you are buying than find out in the first big storm.