People move a budget from Dallas to Houston by adding a contingency percentage. It does not work, because the two things that make Houston different are not cost escalations. They are engineering constraints that change what gets built.
Houston Is on the 2021 Codes, and That Date Matters
Houston City Council approved adoption of the 2021 International Codes in October 2023, effective 1 January 2024. The adoption was announced by the International Code Council, and permits are administered through the Houston Permitting Center.
If you have a prototype drawn for an older edition, or drawn for a different Texas city, it is not automatically compliant here. That is a real risk in Texas specifically, because there is no mandatory statewide building code and cities adopt on their own schedules.
Wind Is an Engineering Input, Not a Contingency
Basic wind speed is determined site-specifically under ASCE 7, and Houston's is materially higher than North Texas. This is the part people underestimate, because it does not show up as a bigger number against the same design. It shows up as a different design: heavier frames, different connection detailing, more anchorage, different roof attachment.
You can look up the governing wind speed for a specific parcel yourself using the ASCE 7 Hazard Tool, which is the same source an engineer will use. Do it before you set a budget rather than after, because a structural design driven by a wind speed you did not price is not a change order, it is a redesign.
Note that Houston is inland of the coastal windstorm certification program administered by the Texas Department of Insurance, which applies to the designated coastal tier counties. Being outside that program does not mean wind is not governing. It means the verification path is ordinary plan review rather than TDI certification.
Flood Plain Elevation Is Decided Before the Slab
Finished floor elevation and site drainage are engineering decisions in Houston, driven by the parcel's flood zone designation. You can check a specific address against the current effective mapping through FEMA's Flood Map Service Center.
The reason this belongs in a cost article rather than an engineering one is timing. A slab poured at the wrong elevation cannot be corrected afterwards. Every other mistake on a commercial job has a remedy; this one has a demolition. Resolve elevation and drainage before foundation design, and treat any fill, detention or drainage work the flood zone requires as a site cost line rather than an allowance.
No Zoning, But Deed Restrictions Still Bite
Houston famously has no zoning ordinance. It removes a review step and it does not remove constraint, because private deed restrictions still apply, are enforced privately rather than by the city, and frequently control use, setbacks, parking and signage on a commercial parcel.
The failure mode is specific: a buyer prices a site on the assumption that no zoning means no limits, designs to that, and discovers the restriction from a neighbor rather than from a reviewer. Read the restrictions during due diligence, not during design.
What Actually Moves a Houston Number
In rough order of impact on a commercial project here:
**Structural design driven by site wind speed.** Not a percentage adder. It changes member sizing and connection detail.
**Foundation and site work driven by flood elevation.** Fill, detention, drainage, and elevation of the finished floor.
**Corrosion protection.** Gulf Coast humidity makes coating specification a real decision on exposed steel rather than a default.
**Permit review duration.** Parallel discipline review means an incomplete set stalls on whichever reviewer it shorted. Budget review time separately from construction time.
**Certificate of occupancy.** If the use of a space is changing, this is a separate application from the building permit and cannot issue until every trade inspection clears. It is the most common reason a tenant misses an opening date.
Material Cost Is the Same Everywhere, and It Is Moving
None of the above is about material prices, which do not vary much by metro. They do vary over time, and 2026 has not been quiet. The Bureau of Labor Statistics Producer Price Index is the primary series for this, and steel mill products specifically can be tracked at FRED series WPU1017.
Both are free and both are more useful than any contractor's assurance about where prices are going, ours included.
How We Quote Houston
We are based in Richardson and Houston is roughly four hours away, so Houston work carries a real mobilization cost. We show it as its own line item rather than folding it into the square-foot rate, because a rate with travel baked in is a rate you cannot compare against a local bidder.
Beyond that, the estimate separates construction, site work, permitting and allowances, and states what is still open. On a Houston job the site work line is usually the one that decides whether the budget holds.