Whole House Repiping in Tustin, CA
PEX and copper. Galvanised out, and slab runs abandoned rather than chased. 92780, 92782 and North Tustin 92705.
A repipe replaces the supply lines in a house rather than repairing them one failure at a time. Single storey typically runs $8,500 to $19,000 in Tustin and two storey $14,000 to $32,000. The usual triggers are galvanised steel corroding inward, or a second or third slab leak in the 1950 to 1975 tracts.
When a repipe is cheaper than repairs
This is arithmetic rather than opinion, and a contractor worth using will do it in front of you.
A first failure on otherwise sound pipe is a repair. The question changes at the second and third, because at that point the failures are telling you about the condition of the whole system rather than about one unlucky joint.
Three spot repairs at $3,000 each is worse than one repipe, and that is before you count the water damage, the drywall, the flooring and the time. The honest test: ask the contractor what they expect the next five years to look like on your specific pipe, and ask for both the repair price and the repipe price side by side.
The clear triggers
- Galvanised steel supply. Standard in Old Town Tustin stock from the 1880s through the 1930s and present as branch lines well into the post war tracts. It rusts from the inside out, so you get brown water on first draw, pressure dropping at the furthest fixtures, then pinholes, then a joint letting go at full pressure. Galvanised is worth replacing wholesale rather than chasing.
- A second or third slab leak. In the 1950 to 1975 tracts along the Red Hill corridor and through Broadmoor, copper sits in or beneath slab on grade. Once pinhole corrosion has started it does not stop at one point.
- Polybutylene. Present in a subset of earlier Tustin Ranch builds. It fails at fittings with little warning, which makes planned replacement considerably more attractive than reactive repair.
- Pressure loss across the whole house. Not one fixture, all of them. Usually scale narrowing old pipe, and no fixture level repair addresses it.
- Recurring pinholes in copper. At 13 to 19 grains per gallon, scale narrows the pipe, which raises velocity, which accelerates erosion corrosion at bends. Recurring pinholes are a system condition.
PEX or copper in this soil and this water
Both are legitimate. There are genuine reasons PEX tends to win here specifically, and genuine reasons some people still choose copper.
The case for PEX in Tustin
Two local factors favour it. First, soil movement: the ground here expands with atmospheric river rain from November to March and contracts hard through Santa Ana wind conditions from September onward. PEX flexes with that cycle rather than resisting it, which is exactly the stress that works rigid joints apart. Second, water chemistry: PEX does not scale internally and does not suffer the pinhole corrosion that takes copper at 13 to 19 grains per gallon.
It is also faster to install with fewer joints, which usually means less demolition and a shorter job.
The case for copper
A long and well understood service life, resistance to physical damage, and some homeowners simply prefer it. It remains a perfectly good choice, particularly where a softener is being fitted at the same time to address the water chemistry that shortens it.
Practical points either way
- PEX is UV sensitive. Any exposed run, in a garage or an attic near a vent, needs protecting or sleeving.
- Insulate attic runs. A repipe frequently routes overhead through the attic, which in a Tustin summer means hot water lines sitting in genuinely hot air and cold lines picking up heat.
- Abandon slab runs, do not chase them. The standard approach on slab on grade is to leave the failed line in the concrete and route the new one overhead. No slab cutting, and that section never troubles you again.
- Replace angle stops at the same time. New pipe feeding twenty year old calcified shutoffs is a false economy for the sake of a small marginal cost.
What the job actually involves
Knowing the sequence lets you spot a quote with something missing, and tells you what to expect to live with.
- Walkthrough and route planning. Where the new lines will run, where access holes go, and how many. Ask to see this marked before work starts.
- Access cutting. Drywall openings at each fixture and at route changes. This is the disruptive part and the extent of it varies substantially with the route chosen.
- New lines run and pressure tested. Nothing gets closed up before the test and the rough inspection.
- Rough inspection. The inspector sees it open.
- Tie in and fixture reconnection. Water off for part of a day, usually not the whole job.
- Patching. Establish clearly whose scope this is. Some contractors patch and texture, some patch only, some do neither and leave it to you. This is the single most common source of repipe disputes, so get it in writing.
- Final inspection.
Ask how many days you will be without full water service, and whether one bathroom stays live throughout. On an occupied house that answer matters more than most people anticipate.
What a repipe costs
| Scope | Typical range | Notes |
|---|---|---|
| Whole house, single storey | $8,500 to $19,000 | Most of Tustin’s affected stock is single storey ranch, which is the easier case. |
| Whole house, two storey | $14,000 to $32,000 | More runs, more drywall, more access work. |
| Partial, one side or one zone | $4,500 to $12,000 | Sensible where failures have been confined to the hot side, which is common because hot lines fail first. |
| Branch repipe during a remodel | $1,500 to $5,000 | Marginal cost while walls are already open. Substantially cheaper than standalone. |
| Drywall patch and texture, if separate | Varies | Establish whether this is included, patch only, or excluded entirely. |
| Angle stops and supply lines throughout | $700 to $1,800 | Worth bundling. Do not feed new pipe through old calcified stops. |
Typical ranges, not a quote. Ask for the patching scope in writing, ask how many access holes are planned, and ask whether a softener is worth fitting at the same time given hardness at 13 to 19 grains per gallon. California caps a home improvement deposit at $1,000 or 10 percent of the contract, whichever is less, and gives you three business days to cancel, five if you are 65 or older. On a job this size, those protections are worth knowing.
Permits
Repiping is permitted work under the 2025 California Plumbing Code, effective 1 January 2026, and it is inspected at rough stage before anything is closed up. Only a licensed contractor can pull the permit.
City of Tustin Building Division
Submittals go through the Citizen Self Service portal. The permit counter is on 714-573-3130. Plan checks not handled at the counter are generally returned within 10 working days on a first submittal and 5 on a resubmittal.
County of Orange
North Tustin, Cowan Heights, Lemon Heights and Panorama Heights are unincorporated, so permits are filed with the County rather than the City. Only a licensed contractor can pull one.
An unpermitted repipe is a serious escrow problem, because it is substantial concealed work with no inspection record. Retroactive permitting on closed walls is considerably harder than permitting it properly the first time.
Verify the licence
This is among the largest residential plumbing contracts there is. Two minutes of checking is proportionate.
- Go to cslb.ca.gov and use the licence lookup. Search by licence number, business name or personal name.
- Confirm the classification is C-36. That is the plumbing contractor classification. A general B licence is not the same thing.
- Check the status is active and the expiration date has not passed.
- Check bond and workers compensation on the same record. Licensed, bonded and insured are three separate protections and a company can hold one without the others.
- Read the complaint and disciplinary history shown on the record.
California requires licensed contractors to publish their licence number in every advertisement soliciting work, under Business and Professions Code section 7030.5. Several plumbing companies ranking for Tustin searches show no licence number anywhere on their websites. Under section 7027.1, advertising for construction work without holding a licence in the classification advertised is a criminal misdemeanor in this state.
Repiping questions
How much does a whole house repipe cost in Tustin?
Single storey typically runs $8,500 to $19,000 and two storey $14,000 to $32,000. A partial repipe of one side or zone runs $4,500 to $12,000. Doing a branch during an existing remodel is far cheaper at $1,500 to $5,000 because the walls are already open. These are published ranges, not quotes.
Is PEX or copper better for a Tustin repipe?
PEX has two specific local advantages: it flexes with the seasonal soil movement that works rigid joints apart here, and it does not scale internally or suffer the pinhole corrosion that takes copper at 13 to 19 grains per gallon. Copper remains a legitimate choice with a long service life. PEX is UV sensitive so exposed runs need protecting.
Do you have to cut the slab to repipe?
Normally no. The standard approach on slab on grade is to abandon the failed line in the concrete and route the new one overhead through the attic and down the walls. That avoids slab cutting entirely and means that section never causes trouble again. It does mean drywall access holes.
When should I repipe instead of repairing?
A first failure on sound pipe is a repair. At the second or third failure on the same system, further ones are a matter of when rather than if, and a repipe costs less over five years than a sequence of repairs plus the water damage. Galvanised steel and polybutylene are worth replacing wholesale rather than chasing.
How long does a repipe take and will I be without water?
Most single storey houses are a few days. You will be without full water service for part of it rather than the whole job. Ask specifically whether one bathroom stays live throughout, because on an occupied house that makes a substantial difference.
Is the drywall repair included?
This varies enormously between companies and it is the most common source of repipe disputes. Some patch and texture, some patch only, some exclude it entirely. Get the patching scope in writing before you sign, and ask how many access holes are planned.
Do I need a permit to repipe?
Yes, and it is inspected at rough stage before walls are closed. Addresses in 92780 and 92782 permit through the City of Tustin Building Division, and unincorporated North Tustin in 92705 through the County of Orange. An unpermitted repipe is a significant escrow problem later.
Should I fit a water softener at the same time?
Worth pricing. At 13 to 19 grains per gallon, hard water is part of what shortened the pipe you are replacing, and softening protects the new system along with the water heater, the fixtures and every shutoff valve. If you are already spending five figures, the marginal cost is proportionately small.
Chasing leaks on the same system?
Ask for the repair price and the repipe price side by side, and ask what the next five years look like on your pipe. Then decide with the numbers in front of you.
Referral service disclosure. Tustin CA Plumber is a local plumbing referral and information service. We are not a licensed plumbing contractor and we do not perform plumbing work ourselves. Nothing on this page is an offer to perform work or a quotation. All plumbing work is carried out by independent contractors licensed by the California Contractors State License Board in classification C-36, operating under their own licence, bond and insurance. Your assigned contractor is responsible for providing their CSLB licence number on your written estimate and invoice, and you should verify it at cslb.ca.gov before work begins.
Code, permit and utility information on this page was last reviewed September 2026 and is general guidance, not legal, insurance or engineering advice, and not a substitute for confirming requirements for your specific property with the City of Tustin Building Division, the County of Orange, your water provider or your insurer. Prices shown are typical ranges drawn from published cost research, not quotes. Every job is priced in writing after inspection.