What to Check in a Colorado Home Plumbing Inspection

Walk a Colorado home with a room-by-room plumbing checklist before writing an offer, and schedule a licensed plumber's full inspection the moment the contract is signed: supply lines, every drain, the water heater, and a sewer scope on anything built before 1985. What you find changes either the offer or the repair-credit conversation that follows it.

Room-by-room: what to check yourself before an inspector even arrives

• Under every sink: look for water stains, soft or swollen cabinet wood, and a shutoff valve that turns freely.
• Around the water heater: check the manufacture date on the rating plate, look for a drip pan and a floor drain, and note any rust streaks down the tank.
• At every toilet: flush and watch how fast the tank refills; a slow refill points to a supply line or fill valve issue.
• In the basement or crawl space: look at exposed pipe material and note any patched sections, hose clamps, or mismatched fittings.
• Outside: find the main shutoff valve and the sewer cleanout, and check whether hose bibs have a frost-free design suited to Colorado winters.
• In the laundry room: check the washing machine hoses for cracking; braided steel replacements cost little and prevent one of the more common sources of home water damage.

Arranging the full inspection

Book a licensed plumber the day the purchase contract is signed, since Front Range plumbers book out further during winter, holidays and spring, and a delayed inspection eats into the negotiated inspection objection window. Ask specifically for a sewer camera scope on any home built before 1985, since that is the single check with the highest odds of turning up an expensive surprise on an older Front Range property. A plumber who already works across Denver, Aurora, Lakewood and Colorado Springs will know the permit and utility inspection process for each jurisdiction, which saves a round of phone calls if the visit turns up something that needs a follow-up repair.

Key areas a licensed plumber inspects

Budgeting for what the inspection finds

Set aside a contingency of at least 1% to 2% of the purchase price for plumbing repairs on any Colorado home built before 1990, since older pipe materials, hard water scale, and expansive soil stress all compound with age. A buyer walking in with that number already budgeted negotiates from a position of information instead of surprise when the inspection report lands.

Permits: verify, don't assume

Ask the seller's agent for permit records on any past water heater replacement, sewer repair, or repiping job; Denver, Aurora and most Front Range counties keep these on file and searchable online. An unpermitted repair is not automatically a dealbreaker, but it does mean treating the work as unverified and budgeting for a professional to confirm it meets code rather than assuming it does. The Kenna Real Estate Group's Denver HOA rules and fees guide covers a related question worth asking early: whether an HOA or metro district requires its own sign-off on plumbing work that touches shared lines.

DIY versus professional: where the line should be

A buyer can check water pressure with a $10 gauge, look for visible leaks, and flush every toilet during a showing. Anything past that, sewer scoping, pressure testing the supply system, or evaluating a water heater's internal condition, needs a licensed plumber with the right equipment. Skipping the professional step to save the inspection fee is the single most common way Colorado buyers end up paying far more after closing than the inspection would have cost. Treat the plumber's fee as part of the purchase budget, not an optional add-on, the same way a buyer already budgets for an appraisal or a survey.

Comparing plumbing repair quotes without getting burned

When a plumbing inspection turns up a repair, get at least two written quotes before negotiating with the seller, and compare scope against scope rather than just the bottom-line number. One quote includes parts and cleanup while another is labor-only; one includes a written warranty while another does not mention one at all. Ask each contractor to itemize what's included, what's excluded, and what condition would trigger a change order, since that level of detail is what keeps a repair from turning into a dispute mid-project. The Kenna Real Estate Group's Colorado closing costs guide breaks down how a negotiated repair credit gets applied at the closing table instead of paid directly by the seller.

Cheap fixes versus expensive fixes

Knowing which category a finding falls into before the negotiation starts keeps expectations realistic on both sides of the table.

Red flags that warrant a second opinion

• Active water stains on a ceiling below a bathroom, which points to a leak that has been running for a while, not a one-time event.
• A strong sewer odor anywhere in the house, especially in a basement.
• Visible corrosion or green staining on copper fittings, a sign of a slow leak at a joint.
• A water heater older than 12 years with no service records on file.
• Multiple slow drains that the seller attributes to normal use rather than a documented fix.

What expansive soil changes about the checklist

Because Front Range clay soil expands and contracts with the seasons, add a specific question for the seller: has the sewer line ever backed up, and has the foundation ever been evaluated for movement? A yes to either question is a reason to scope the line before the inspection objection deadline rather than after closing, when the same finding becomes a full out-of-pocket repair instead of a negotiation point.

Ask for the printable plumbing inspection checklist in the form below and we email it the same day, so you have this room-by-room list on your phone during the next showing.

Where to go next

• The Colorado Home Buyer's Guide
• Making an offer on a Colorado home
• Closing costs for Colorado home buyers
• What clogged drains can reveal about a home before you buy
• Denver plumbing inspection tips for buyers
• Homes for sale in Denver, CO

Talk to the Kenna Real Estate Group

The Kenna Real Estate Group walks Front Range buyers through the checklist before every showing and helps line up a licensed plumber the same week an offer is accepted. Call or text 303-955-4220. A live person answers. Not a robot, not a phone tree. Ready to look at homes now? Search every home for sale in Colorado.