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Pipe Repair & Replacement — PEX, Copper & PVC
Delex Plumbing repairs and replaces pipes of all materials across Mississauga — copper, PEX, PVC, and galvanized steel. From pinhole leak repair to whole-home repiping, our licensed plumbers diagnose the real problem and fix it right the first time.
Pipe Repair — Pinhole Leaks, Burst Pipes & Corrosion
Pipe failures take several forms in Mississauga homes. Pinhole leaks in copper pipe are the most common — caused by a combination of hard water from Peel Region’s calcium-rich water supply and electrochemical corrosion at flux residue left during original installation. Small pinhole leaks often go undetected behind walls for months before a wet patch appears, by which point the adjacent drywall and framing may already need replacement.
Our pipe repair service uses solder patches, compression couplings, or push-to-connect fittings depending on the location and access. For pipes with multiple leaks in the same section, we recommend replacing the affected run rather than patching repeatedly — the material cost difference is small and whole-section replacement eliminates the underlying corrosion problem.
Peel Region’s water supply has a calcium carbonate hardness of 18 to 20 grains per gallon — one of the highest in Ontario — which accelerates the electrochemical corrosion that causes pinhole leaks in copper supply systems. Homes with copper supply pipes installed before 1985, when installation practices sometimes left excess flux residue inside the pipe, are particularly susceptible.
The location of a pinhole leak matters for determining the repair scope. A single pinhole in an accessible straight run warrants a targeted patch or compression coupling repair. Pinholes in inaccessible sections — inside wall cavities, beneath concrete slabs, or in joists — require a more significant access decision. We use thermal imaging to locate the wet zone and acoustic detection to pinpoint the source before recommending any access opening.
Lead service lines — found in some Mississauga properties built before 1955 — qualify for provincial health authority replacement programs. Health Canada designates lead pipe removal as a public health priority, and Peel Region maintains information on eligible funding. We handle the full lead service line replacement, from the city curb stop to the basement entry point, and assist with the provincial rebate application.
Full house repiping from galvanized to PEX typically takes two to three days for a standard Mississauga detached home. We work in phases, restoring water service to one floor at a time to minimize disruption. The finished system includes a PEX manifold with individual fixture shutoffs, dramatically simplifying any future fixture service or emergency isolation.
Galvanized Pipe Replacement — PEX Repiping
Galvanized steel supply pipes were standard in Canadian home construction through the mid-1970s. After 50 years of service, internal corrosion has reduced the bore of most galvanized supply lines from their original 3/4-inch or 1/2-inch diameter to a fraction of that — some sections as narrow as a pencil from 50 years of rust accumulation. The result is permanently low water pressure throughout the house.
Galvanized pipe replacement with PEX is the most transformative residential plumbing upgrade a pre-1975 Mississauga home can receive. PEX (cross-linked polyethylene) is flexible, frost-resistant, carries a multi-decade warranty, and can be run without joints through walls and joists, reducing future leak points. We install PEX with a manifold distribution system, which also allows individual fixture shutoffs for maintenance without disrupting the whole house.
Frozen & Burst Pipe Repair — Emergency Response
Frozen pipes typically occur in Mississauga during January and February cold snaps when temperatures drop below -15°C for consecutive days. Pipes in exterior walls, unheated crawl spaces, and garage wall cavities are most vulnerable. When water freezes inside a supply pipe, the expansion pressure typically bursts the pipe at its weakest point — usually a joint, a thin section, or where the pipe curves.
Our frozen and burst pipe emergency service includes safe thawing of frozen pipes using heat guns (never open flame), repair or replacement of burst sections, and a post-repair assessment to identify other at-risk pipe locations that should be insulated before the next cold snap.
Low Water Pressure — Diagnosis & Repair
Low water pressure has multiple potential causes, and correctly identifying the source before recommending a repair saves both time and money. A partially closed main shutoff valve reduces pressure building-wide. A failing pressure reducing valve (PRV) causes either very low or very high pressure throughout the home. Corroded galvanized pipes narrow the supply bore. A municipal supply issue affects the entire street.
Low water pressure has multiple potential causes, and correctly identifying the source before recommending a repair saves both time and money. A partially closed main shutoff valve reduces pressure building-wide. A failing pressure reducing valve (PRV) causes either very low or very high pressure throughout the home. Corroded galvanized pipes narrow the supply bore. A municipal supply issue affects the entire street.
Water pressure booster pumps are an appropriate solution when the municipal supply pressure to the property is genuinely low — a condition that occurs in some areas of Mississauga’s older distribution grid and in properties at significant elevation above the main. We install constant-pressure booster pump systems that maintain steady pressure at all fixture points regardless of simultaneous demand.
We diagnose low water pressure with a professional pressure gauge at the main supply line, compare it to the pressure at individual fixtures, and test the PRV function to isolate the cause. Galvanized pipe corrosion is the correct diagnosis for pre-1975 homes with uniformly low pressure; PRV failure is the correct diagnosis for post-1985 homes with sudden pressure changes.
Noisy Pipes — Water Hammer & Pipe Support
Water hammer — the loud banging sound when a valve closes quickly — is caused by the kinetic energy of moving water being arrested suddenly. Dishwashers and washing machines with solenoid valves are common sources. We install water hammer arrestors at the affected fixture connections, which absorb the pressure spike and eliminate the noise. For banging pipes that occur during regular use of taps, the issue is usually loose pipe hangers that allow the pipe to move; we add support hangers at the problem sections.
Lead Pipe Removal
Some Mississauga properties built before 1955 have lead service lines connecting the municipal main to the home’s internal supply system. Health Canada classifies lead pipe as a health concern due to lead leaching into drinking water, and provincial programs provide partial funding for replacement. We handle the full lead service line replacement, from the city curb stop to the point of entry in the basement, and assist with the application for available provincial rebates.
Pipe Plumbing Service Area
Delex Plumbing provides pipe repair and replacement services across all Mississauga neighbourhoods and the GTA. Emergency pipe repair available 24/7 at 416-910-2550.
Same-Day Service — Mississauga's Most Responsive Plumbing Team
Same-day plumbing service in Mississauga is available when you call before 10 a.m. on weekdays. We confirm a two-hour arrival window during your call and send a text notification when the plumber is 30 minutes away. If any scheduling change affects your window, our dispatcher calls you proactively — we do not leave clients waiting without information.
Our service vehicles are stocked with the 50 most commonly needed repair parts and materials. For the majority of Mississauga residential plumbing calls, this means the repair is completed on the first visit without a parts run to the supplier. On the rare occasion where a specialized part is required, we have established same-day supplier relationships and can typically complete the repair the same day in most cases.
Evening and weekend appointments are available for non-emergency work by advance booking. We schedule these appointments at the same flat-rate pricing as weekday service — no premium for Saturday or early evening availability. For clients who cannot take time off work for a plumbing appointment, we provide the weekday scheduling flexibility that makes routine service accessible without using vacation time.
Why Mississauga Homeowners Choose Delex Plumbing
Delex Plumbing has built its reputation across Mississauga through 10 years of consistent service — same-day response, flat-rate pricing with no surprise charges, and licensed master plumbers on every job. Our 384 verified five-star Google reviews reflect the cumulative experience of homeowners from Port Credit to Meadowvale who called us once for a routine repair and have called back for every plumbing need since.
The three things our clients most consistently cite in their reviews: we arrived when we said we would, the invoice matched the quote, and the plumber left the work area clean. These are not exceptional standards — they are baseline professional standards that should characterize every service business. We treat them as the floor rather than the ceiling of what our service delivers.
Our flat-rate pricing policy means the quote we provide before touching anything is the amount on your invoice when we leave. No overtime charges for after-hours calls. No travel fees for distances within our service area. No material markups disclosed after the job is done. Transparent pricing is how we have maintained a 5.0-star rating across 384 reviews — clients who receive exactly what they were quoted do not leave one-star reviews.
We back every job with a written labour warranty. If something we installed or repaired fails within the warranty period, we return and fix it at no charge. No runaround, no dispute about scope. The warranty documentation is included with the invoice and specifies the exact duration and scope of coverage. For fixture and material warranties from manufacturers, we register the installation and provide the registration confirmation so warranty claims go smoothly without paperwork obstacles.
Licensed & Insured — Pipe Plumbing by Certified Professionals
Every plumber on the Delex team holds a valid Certificate of Qualification from the Ontario College of Trades. This licence is not a formality — it is the legal prerequisite for performing plumbing work in Ontario, and it represents a minimum of 9,000 hours of apprenticeship training plus a journeyman examination that tests both technical knowledge and code compliance.
Full liability insurance protects your property if any accidental damage occurs during our work. Bonded coverage protects you from any dishonesty by our employees while on your property. WSIB coverage protects you from any liability if a worker is injured on your property. These are not optional additions to our service — they are standard protections that every legitimate plumbing company carries and that unlicensed operators routinely lack.
We pull permits for all work that requires them. Ontario Building Code requires permits for new plumbing installations, changes to drain and vent systems, and water heater replacements. A job done without a required permit leaves you without a legally completed installation — a disclosure obligation in real estate transactions and a potential coverage issue in insurance claims. Our permit fees are included in the project quote rather than added as a surprise at the end.
Frequently Asked Questions About Emergency Plumbing
Q: How much does pipe replacement cost in Mississauga?
A: Spot repair of a single pipe section runs $250 to $600. Whole-home repiping from galvanized to PEX costs $4,000 to $12,000 depending on home size and access. We provide a free on-site estimate after assessing the scope — call 416-910-2550.
Q: Should I repair or replace a leaking copper pipe?
A: A single pinhole leak on a pipe that is otherwise in good condition warrants repair. Multiple leaks in the same area, or leaks on pipes with visible green corrosion (copper sulphate), indicate systemic corrosion that will continue to produce new leaks. In that case, section replacement is more cost-effective than repeated patching.
Q: How long does PEX pipe last compared to copper?
A: PEX carries a 25-year manufacturer warranty and is projected to last 50-plus years in normal residential use. Copper in good condition lasts 70-plus years but is susceptible to pinhole corrosion from hard water chemistry. For Mississauga’s high-calcium water supply, PEX often performs better long-term.
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Or Give Us A Call: 416-910-2550
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100% Quality Work Free Estimates — Call 416-910-2550
Every pipe job starts with a free estimate. Call 416-910-2550, contact us, or request service and we will confirm your appointment within the hour.
