Do You Need a Permit to Build a House in Montgomery County?
If your lot is outside any city's limits, Montgomery County does not issue a building permit for a new house and does not inspect the structure. You will still need several other permits — septic, floodplain, an address, usually a driveway — but nobody from the county is checking your framing.
That is a much bigger deal than it sounds, and most people hear it as good news when it is really a transfer of responsibility onto them. Here is what is actually required, who enforces what, and what fills the gap where a building inspector would be.
Does Montgomery County require a building permit for a new house?
Not in the unincorporated county, and not in the sense people mean. Texas counties have limited regulatory authority compared with cities, and Montgomery County has not adopted a comprehensive residential building code with structural plan review and inspections.
What the county does require for new construction in unincorporated areas is a development permit, handled through the county permit office. That review is about floodplain compliance, site development and address verification. It is not a structural plan review. Nobody reads your framing plan, and no county inspector visits at foundation, framing or final.
The county's residential permitting page is the authoritative source, and requirements change — confirm current ones before you rely on anything written here.
What permits do you actually need?
Four, typically, and none of them is a building permit.
A development permit. From the permit office, for new construction. This is where floodplain status and your address are settled.
An OSSF (septic) permit. If you are not on municipal sewer — and across most of the unincorporated county you are not — Environmental Health permits the on-site sewage facility. The system has to be designed by a licensed professional, sized to the house, and approved before construction. The county's septic permitting page has the process.
Two things about septic that catch people: it is sized to the number of bedrooms, so adding a bedroom late can force a redesign of the system, and the drain field needs real, usable area that cannot have the driveway, the shop or the pool on top of it. That is a site planning decision, not a late one.
Floodplain compliance. If the structure is in or near the Area of Special Flood Hazard, the finished floor has to be elevated above Base Flood Elevation with freeboard, and a licensed surveyor or engineer has to produce an Elevation Certificate. The county revised these rules recently, so get the current required height from the permit office rather than from anyone's blog. Check your lot on the FEMA Flood Map Service Center before you buy it, not after.
A driveway or culvert approval. From your precinct commissioner, where the driveway meets a county road. Sizing the culvert wrong is a cheap mistake to make and an annoying one to fix.
What if the lot is inside a city?
Then essentially all of the above is replaced by a conventional permit process, and it is a different project administratively.
Inside the City of Magnolia, for example, you submit for a building permit and the city reviews structural, mechanical, electrical and plumbing documents before issuing it. Separate trade permits follow, and the city inspects at foundation, framing, rough-in, insulation and final before issuing a Certificate of Occupancy. Conroe, Montgomery, Willis and Shenandoah each run their own versions.
The practical consequence for your drawings is that a city will reject an incomplete set and the county will not. A thin plan set gets caught at a city permit desk. In the unincorporated county, the same thin set goes straight to a framing crew.
Worth knowing: The Woodlands is in Montgomery County but is not a city. It is a township with its own covenants and a design review process that is stricter than many municipalities — do not assume county rules apply there.
If the county is not inspecting, who is?
Four parties, none of them public, and you should know which ones apply to you before you start.
Your deed restrictions and architectural control committee. In most unincorporated subdivisions this is the real governing authority, and it is often stricter than any city code about things a city would not regulate at all: minimum square footage, masonry percentage, roof pitch, where the garage faces, outbuildings, fencing. An ACC can reject a design you have already paid to have drawn. Get the guidelines before design starts, not after.
Your lender. Construction loans normally require draw inspections and an appraisal, which produces a schedule of its own.
Your insurer. Windstorm and homeowner coverage can require documentation that nobody else asked for.
Your builder. With no public inspection, the builder's own quality control is most of the system. This is the honest argument for hiring one with a track record rather than the cheapest bid, and for a third-party inspection you pay for yourself at foundation, framing and pre-drywall. It costs a few hundred dollars per visit and is the only independent set of eyes in the process.
Do you still need engineered plans?
You need an engineer, yes, and that is not a permitting question.
Foundation design is the obvious one. The expansive clay across this part of the Gulf Coast moves enough seasonally to crack a slab that was not designed for the soil under it, which is why a soils report and an engineered foundation are standard practice here regardless of whether anybody requires them on paper. Your lender or insurer may require the engineer's seal even where the county does not.
On the design side, Texas does not require a registered architect for a single-family home at any size — that exemption is written into Texas Occupations Code §1051.606. But the absence of a requirement is not the absence of a need, and in a county that does not check the drawings, the drawings matter more rather than less.
What does this mean for your plan set?
It means the plan set is the specification. There is no second check.
Inside a city, a plan reviewer catches a missing header schedule and a framing inspector catches a wall built wrong. Outside one, both of those become questions a framer answers on a Tuesday morning by doing whatever seems reasonable. Every sheet you did not buy becomes a decision someone else makes for you, quickly, under time pressure, without knowing what you wanted.
So the sheets that are optional elsewhere are not optional here: a forming plan, building sections cut through your actual house, a detail sheet, and door, window, header and lintel schedules. Interior and cabinet elevations matter for the same reason — not because a code official wants them, but because nobody else is going to decide what your kitchen looks like correctly by accident. Our breakdown of what's actually in a set of house plans is the list to check yours against.
The order to do this in
- Check floodplain status on the FEMA map and get the deed restrictions and ACC guidelines — before you close on the lot
- Confirm whether the lot is inside a city, and which one
- Get a boundary survey, plus a topographic survey if the lot has any slope
- Soils report, then an engineered foundation design
- Design the house inside the real constraints — setbacks, drain field area, ACC rules, flood elevation
- Septic design and OSSF permit
- Development permit, address, driveway approval
- Arrange your own third-party inspections at foundation, framing and pre-drywall
The short version
- Unincorporated Montgomery County issues no residential building permit and performs no structural inspection
- You do need a development permit, an OSSF septic permit, floodplain compliance and usually a driveway approval
- Inside a city, expect full plan review, trade permits and inspections through to a Certificate of Occupancy
- Deed restrictions and the ACC are usually the strictest authority you will deal with
- An engineered foundation is standard practice here whether or not anyone requires it
- Hire your own third-party inspector — it is the only independent check that exists
- With no public plan review, the completeness of your drawings is the whole quality control system
People hear "no permit required" and think they have been handed freedom. What they have actually been handed is the inspector's job.