A Houston home inspection takes two or three hours and produces a report that runs 40 pages or more. Buyers read it and assume the plumbing was covered. It was, up to a point. The inspector checked what a licensed inspector is required to check, which is everything that can be seen, reached, and operated. The parts of a plumbing system that cost the most to fix, the sewer line and the pipes under the slab, are the parts no general inspection can see.
This guide explains what the standard inspection covers, where its limits are, which add-on inspections are worth buying inside the option period, and what to look for by the age of the house. If you are under contract now and want a plumber’s eyes on the house, the visit is free, and you can call or text (713) 409-7176 to get the sewer camera on the schedule before the option period runs out.
What a Texas Home Inspector Checks on the Plumbing
Licensed inspectors in Texas follow the Texas Real Estate Commission Standards of Practice (22 TAC 535.227 through 535.233) and report on the TREC form REI 7-6. For plumbing, the standards cover the supply and distribution system, fixtures, drains, wastes, vents, and the water heating equipment. The inspector marks each item inspected, not inspected, or not present, and reports conditions the standards define as deficient.
In practice, that means the inspector:
- Runs every faucet, shower, and tub and looks for leaks under sinks and at valves.
- Flushes every toilet and checks that it is secure to the floor and does not run.
- Notes functional flow (does pressure drop badly when two fixtures run) and functional drainage (does the tub drain while the sink runs).
- Looks at visible supply piping in the attic, garage, and under sinks and notes the material.
- Checks the water heater: energy source, capacity, visible condition, venting, the drain pan, and the temperature and pressure relief valve and its discharge pipe, which must exist and terminate correctly.
- Operates accessible shutoff valves by hand and reports ones that fail to operate.
- Reports visible evidence of past leaks, such as stains and soft drywall.
That is useful work. It catches a leaking angle stop, a water heater with no pan in an attic, a toilet that rocks, and a tub that drains slow.
What the Inspection Cannot Tell You
The standards limit the inspector to what is present, visible, and accessible at the time of the inspection. The inspector does not:
- Run a camera through the sewer line.
- Pressure-test the water lines or perform a hydrostatic test on the drains.
- Open walls, lift flooring, or dig.
- See any pipe under the slab, which in Houston is most of the drain system and often the water lines too.
- Confirm that the water heater or any past repair was permitted.
- Measure static water pressure with a gauge in most cases, though some do.
A sewer line full of roots, a cast iron drain that is rusting through under the slab, a copper water line pitting under the kitchen floor, and a polybutylene supply system behind the drywall can all pass a general inspection with no mention, because nothing was visible on inspection day.
Add-On Inspections Worth Buying
| Add-on | What it finds | Who needs it | Cost |
|---|---|---|---|
| Sewer camera inspection | Roots, bellies, offsets, cracked or rusted drain line, missing cleanout | Any home built before 2000, any lot with big trees, any history of backups | $295 to $350 at Hugo, depending on access |
| Hydrostatic test | Leaks in the drain system under the slab | Pre-1980 slab homes, cast iron drains, homes with foundation repair history | Priced on site after the camera |
| Static pressure reading | Pressure over 80 psi, a missing or failed PRV | Every home; takes two minutes with a gauge on a hose bib | Part of a plumbing inspection visit |
| Water heater permit check | Unpermitted replacement, missing pan, bad venting, no expansion tank | Any heater newer than the house | Part of a plumbing inspection visit |
| Leak detection | Water line leak under the slab or in the yard | Meter moves with everything off, soft spots on floors, high bill on the seller’s disclosure | Priced on site |
The sewer camera is the one add-on almost every buyer should order. A sewer camera inspection before buying costs a small fraction of a sewer repair and reveals the single largest plumbing liability on an older Houston lot. If the camera shows corroded cast iron or standing water in the line, a hydrostatic test answers the next question: is it leaking under the slab now?
A full plumbing inspection from a licensed plumber covers the pressure reading, the water heater review, the shutoff valve check, and a look at every accessible supply line and drain, and it comes with a written list of what to fix and roughly what it costs. Pair it with the sewer camera inspection and you have the whole system covered in one visit.
Houston Red Flags by Home Era
| Built | Supply pipe to expect | Drain pipe to expect | What to check |
|---|---|---|---|
| Before 1970 | Galvanized steel, sometimes copper | Cast iron under the slab, clay in the yard | Rust-colored water, low pressure, cast iron rusting through, roots in clay joints |
| 1970 to 1995 | Copper under the slab; polybutylene in many 1978 to 1995 homes | Cast iron early, PVC later | Polybutylene (gray pipe, crimp fittings), copper slab leaks, foundation repair history |
| 1995 to 2010 | Copper or early PEX | PVC | Builder-grade fixtures failing, water heaters at end of life, attic heaters with no pan drain |
| 2010 and newer | PEX | PVC | Unpermitted additions, water softener loops left open, PRV never installed |
| Any flipped home | Whatever was there | Whatever was there | New fixtures over old pipe, paint over stains, no permits on the water heater |
Houston’s clay soil moves with wet and dry seasons, and that movement is why so many homes here have had foundation work. A foundation lift stresses every pipe that passes through the slab. If the seller’s disclosure mentions foundation repair, treat the sewer camera and the hydrostatic test as required, not optional. Cast iron drain lines in older Houston homes are the most common expensive finding; most are past their service life.
On the supply side, galvanized pipe is a repipe waiting to happen, and polybutylene fails at the fittings without warning. Our guide to signs you need to repipe explains how to recognize both so you can price a repipe into your offer instead of discovering it after closing.
The Option Period Timeline
Texas contracts use a negotiated option period, commonly 7 to 10 days, during which you can terminate for any reason. Every inspection has to be done and read inside it.
- Day 1 to 2. General inspection. Read the plumbing section the same day and note any slow drains, water heater deficiencies, or pipe material notes.
- Day 2 to 3. Sewer camera inspection. Book it as soon as the contract is executed, since good inspectors and plumbers fill up. Do not wait for the general report to decide.
- Day 3 to 5. If the camera or the general report raises a slab question, run the hydrostatic test and any leak detection.
- Day 5 to 7. Get written repair estimates for anything significant so your negotiation is based on real numbers.
- Before the option period ends. Submit a repair request, an amendment for a credit, or your termination.
If you are reading this with three days left, call today. The camera inspection usually fits the same or next day.
Using the Findings
What you find becomes a negotiation. The three common paths:
- Seller repairs. Ask for licensed work with permits where the city requires them, such as a permitted water heater replacement or a sewer line repair, and ask for the invoice and permit record before closing.
- Repair credit at closing. You get the money and pick the plumber. Lenders cap credits on some loan types, so check with your lender first.
- Price reduction. Cleanest when the fix is large, such as a repipe or a sewer replacement, and you plan to do it right after closing.
Plumbing condition is one of the biggest swings in a home’s real value, which our guide on how plumbing makes or breaks a home’s value covers from the seller’s side. A reading of 90 psi at the hose bib is worth noting too; high water pressure shortens the life of every fixture and appliance, and a pressure reducing valve is a small fix to request.
When to Call
Call Hugo Plumbing when:
- You are under contract on any home built before 2000 and have not scheduled a sewer camera.
- The general inspection mentions cast iron, galvanized, or polybutylene pipe.
- The seller’s disclosure mentions foundation repair, a past slab leak, or a sewer backup.
- The water heater is in the attic, is newer than the house, or has no record of a permit.
- You want a licensed plumber’s written repair estimate to use in negotiation before the option period ends.
The inspection visit is free, with no trip charge or diagnostic fee, and anything we recommend comes as a flat written price so you know the real number before you negotiate. Sewer camera inspections run $295 to $350 depending on access. Licensed master plumbers (MPL 41319) handle the inspection, and the same team can do the work after closing with financing available on larger jobs like repipes and sewer repairs. Call or text (713) 409-7176.
Frequently Asked Questions
Does a standard Texas home inspection cover the plumbing?
Partly. A TREC-licensed inspector runs the fixtures, checks for visible leaks, notes drainage and flow, and reports on the water heater, including the T&P valve and its discharge pipe. The inspection is limited to what is present, visible, and accessible, so the sewer line, the pipes inside walls, and anything under the slab are outside what the report can tell you.
Should I get a sewer camera inspection before buying a house in Houston?
Yes, on almost any home built before 2000 and on any home with large trees, a history of slow drains, or cast iron drain lines. The general inspector does not scope the sewer. A camera shows bellies, root intrusion, offset joints, and cast iron that is rusting through, which are the most expensive plumbing surprises a buyer can inherit.
What is a hydrostatic test and do I need one when buying a house?
A hydrostatic test plugs the sewer line at the cleanout and fills the drain system to slab level to see if it holds water. A drop means a leak under the slab. It is worth adding on homes built before about 1980 on a slab with cast iron drains, and on any home where the camera shows corrosion or where the seller mentions foundation work.
How long do I have to get plumbing inspections done when buying a house in Texas?
The option period in a standard Texas contract is negotiated, often 7 to 10 days. Every inspection, including the sewer scope and any hydrostatic test, has to be scheduled, completed, and read inside that window if you want to negotiate repairs or walk away without losing your earnest money. Book the sewer camera in the first two or three days.
Can I ask the seller to fix plumbing problems found during inspection?
Yes. You can request repairs, a price reduction, or a repair credit at closing. If the seller agrees to make repairs, ask for licensed work with permits where the city requires them, such as a water heater replacement or a sewer line repair, and ask for the invoice and permit record before closing. A credit lets you choose the plumber yourself.
If the house you want won’t show you its pipes, call Hugo.
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