Markham area · 19th and early 20th century
Plumbers in Unionville
Unionville runs from 19th-century houses on Main Street to 1970s and 80s streets near Toogood Pond, and under those floors you find everything from cast iron stacks and clay laterals to copper and ABS.
- Crews familiar with how this neighbourhood was piped
- Main shut-off and pipe material checked on every call
- Price before work, tested before we leave



Homes and pipes in Unionville
The heritage core along Main Street Unionville has houses that were built long before indoor plumbing was standard. Over the decades, owners added bathrooms in old pantries and upstairs bedrooms, and the pipes show it: cast iron stacks, galvanized supply runs, sections of copper and the odd stretch of newer plastic, all in one house. Work in these homes needs patience and respect for plaster walls and original trim.
Away from the old village, much of Unionville was built from the 1970s into the 1990s. Those houses typically have copper supply, ABS or cast iron drains, and in some cases Poly-B, which is worth checking if you have not already. See Poly-B replacement for details.
Calls this corner of town makes
- Slow main drains caused by roots in clay or cast iron sewer laterals under mature trees.
- Pinhole leaks in aging copper, especially near the water heater.
- Seized main shut-off valves in older basements.
- Bathroom updates in heritage homes where vents and drains must be rerouted.
Root intrusion is the one we see most. The maples and oaks that make Unionville's streets shade those streets send roots looking for moisture, and older sewer joints are an easy target. A camera inspection tells you exactly what is going on before anyone digs.
Through the seasons here
Spring melt raises groundwater near the Rouge River and Toogood Pond, and older basements may see seepage or floor drain backups. A backwater valve deserves thought once the basement is finished. In winter, outside walls in older houses are thinly insulated, so pipes running along them can freeze during cold snaps. Keeping cabinet doors open and a trickle running on the coldest nights helps.
Local landmarks we know
We know the side streets off Main Street Unionville, the homes around Toogood Pond, and the quiet crescents near Unionville High School and Bill Crothers. Parking on Main Street can be tight on weekends and festival days, so we plan visits around that and keep our van out of the way. If your home is on a heritage register, tell us when you call. Exterior changes, for example a fresh wall vent, may need a heritage review, and we would rather plan around that from the start than surprise you halfway through a job.
Inside, we lay down drop cloths, work from the shortest path to the pipes, and clear up before leaving. Older homes deserve that much.
Getting hold of a plumber
Our Unionville calls run from Kennedy Road east to the Rouge and from Highway 7 north toward 16th Avenue. Phone (365) 334-6254 and describe the trouble; we'll explain what we think the problem is and what the fix looks like before we start any work.
The maples and oaks that make Unionville's streets shade those streets send roots looking for moisture, and older sewer joints are an easy target.
From the job notes of Plumbers in Markham
Local file · Unionville
Under the floors in Unionville
| Item | What we usually find |
|---|---|
| Main era | 19th and early 20th century |
| Supply pipe | Galvanized steel, patched with copper |
| Drains and sewer | Cast iron stack, clay lateral |
| Watch for | Roots in the lateral, undersized water service, lead or galvanized remnants |
A general picture of the housing stock. Renovations change what is behind any one wall.
First checks on a call here
- Where the main shut-off and meter sit, and whether the valve still turns
- Age and type of the water heater and its venting
- Floor drain, cleanout and any backwater valve
- Supply pipe material visible in the basement ceiling