Town of Castle Rock · tankless review is not optional
Plumber Castle Rock CO
In Castle Rock a storage-tank water heater and a tankless heater are not the same permit. The Town also describes a water-line split that is not Aurora's sewer tap. Use this page only when the house is inside the Town and on Town water.
Tank versus tankless at the counter
The Town's residential permits page says some residential types may not need plan review, and it names a residential water heater in that group, then adds the exception in the same breath: if the heater is tankless, a review is added for gas piping load calculations. A later note is blunt. Tankless water heaters require a plan review. Provide the manufacturer's specification sheet and the gas piping load calculations. The building phone on that page is 720-733-3527. Building codes adopted by the Town took effect June 30, 2026. Do not recycle an older metro code list.
That is why an Aurora tankless page is not enough for a Castle Rock install. The Aurora page can tell you the conversion is a different machine. This page tells you the Town wants the gas-load math in the submittal. A tank replacement that stays a tank may avoid that review. Ask the counter. Do not promise the homeowner a same-day Aurora-style inspection. Aurora's sentence does not apply, and even Aurora does not guarantee the day.
Water lines, if Castle Rock Water serves the house
The Town's meter FAQ says the Town owns and maintains water service lines to the connection at the property line. The meter pit or curb stop is the Town's, even if the meter sits on the property. Lines from that valve into the home, and the lines in the home, including sewer, are described as the owner's. The FAQ cites Municipal Code 13.12.050. It also says not to close the street valve. For a curb shutoff, the published number is 720-733-6000. Those numbers are the Town's. They are not links on this site.
Read that sewer clause narrowly. It is attached to a water-meter answer. It is not a full map of who repairs a sewer lateral under a Town street. Ask the Town before you open the road. It is still a different picture from Aurora, where the owner keeps the service line through the tap. Parker is unresolved on purpose. Do not mix the three in one quote.
Questions to settle first
Does a tankless heater in Castle Rock need plan review?
Yes, according to the Town's residential permit page. Submit the manufacturer's specification sheet and gas piping load calculations. A storage-tank water heater is listed among types that may not require plan review, with tankless called out as the exception. Confirm the current application. Do not use an Aurora checklist in place of that sheet.
Who owns the water line?
For Castle Rock Water, the Town's FAQ says the Town maintains the service to the property-line connection and owns the curb stop or meter pit. Piping from that valve into the house is the owner's. Do not operate the street valve. Call 720-733-6000 if you need the Town to shut the curb. Confirm the house is on Town water first.
Does the Town also own the sewer in the street?
Do not treat the meter FAQ as a complete sewer map. It says lines in the home, including sewer, are the owner's, in the same answer as the water valve. It does not walk the lateral to the main. Ask the Town before a street cut. Aurora's tap rule and Parker's unsettled boundary are other cities' questions.
