Replacing a bathroom vanity is one of the best value-per-hour DIY projects in a bathroom renovation. A competent homeowner can swap out a standard freestanding vanity in 3–5 hours with basic tools. The project does involve plumbing — shutting off water, disconnecting drain and supply lines, and reconnecting them on the new unit — but none of that requires a licensed plumber in Ontario for a straight swap in the same location. This guide covers the full process, common problems in older GTA homes, and when to call a plumber.
For the total cost of a bathroom renovation in Ontario, see our bathroom renovation cost guide. If you encounter problems with the existing supply valves during this project, see our Toronto emergency plumber cost guide for what to expect.
2026 GTA Bathroom Vanity Pricing
Vanity prices in the GTA vary significantly by size, mount type, and where you buy. RONA and Home Depot are the most accessible options for entry and mid-range units. Premium floating vanities are available through specialty bath showrooms across the GTA (Ciot, TAPS, local bathroom design centres).
| Vanity Type | Price Range (CAD) | Notes |
|---|---|---|
| Entry freestanding, 24" (RONA/HD) | $200–$500 | Includes cabinet; top and faucet usually separate |
| Mid-range, 36" freestanding | $500–$1,200 | Better finish, often includes top |
| Premium floating, 48"+ (wall-hung) | $1,200–$4,000 | Requires solid wall anchoring; top separate |
| Faucet (separate) | $80–$400 | Delta, Moen at big-box; Grohe at bath showrooms |
| P-trap kit | $20–$40 | PVC adjustable; buy new even if old looks OK |
| Supply lines (pair) | $15–$30 | Braided stainless; always replace during a swap |
| Plumber — connection only | $200–$400 | If you're not comfortable with the plumbing portion |
| Full vanity swap by plumber | $350–$700 | Includes disconnect, set, and reconnect (not supply) |
💡 Always Buy New Supply Lines and a New P-Trap
When replacing a vanity, always install new braided stainless supply lines ($15–$30 for a pair) and a new PVC P-trap kit ($20–$40). Old supply lines can fail — a slow drip under a vanity left unchecked causes serious water damage. A new P-trap ensures you have proper trap depth and no hairline cracks in old plastic. The cost is minimal; the leak prevention is significant.
Tools and Supplies You'll Need
🔧 Tools
- Adjustable wrench or channel-lock pliers
- Utility knife (for caulk removal)
- Putty knife (to pry old vanity away from wall)
- Drill/driver
- Level (2-ft minimum)
- Stud finder
- Bucket (for water in the trap)
- Caulk gun
📦 Materials
- New vanity (with or without top)
- Vanity top (if separate)
- Faucet
- Braided stainless supply lines
- PVC P-trap kit (adjustable)
- Plumber's tape (Teflon tape)
- Silicone caulk (100% for bathroom use)
- Shims
- 3-inch wood screws (for wall anchoring)
Step-by-Step: Installing a Bathroom Vanity
Shut Off the Water Supply
Locate the hot and cold angle stop valves under the existing vanity. Turn them clockwise until fully closed. Turn on the faucet to release pressure and confirm the water is off — the flow should stop within a few seconds. If either valve doesn't fully close (water continues to trickle after several turns), do not proceed. Old angle stops in GTA homes built before 1990 commonly fail when turned for the first time in years. Close the main shutoff for the floor or the house, then call a plumber to replace the angle stop before continuing. A working isolation valve is worth $150–$250 in labour now versus a flooded bathroom later.
Disconnect the Drain and Supply Lines
Place a bucket under the P-trap before disconnecting — there will be standing water in the trap. Unscrew the P-trap slip nuts by hand or with pliers (counterclockwise). Remove the P-trap and set it aside. Disconnect the supply lines from the angle stop valves (counterclockwise). Disconnect the supply lines from the faucet tailpieces above. Check that the supply lines are fully empty before setting them aside.
Remove the Old Vanity
Cut any caulk between the vanity top and the wall using a utility knife. Check if the vanity is screwed to the wall — most are secured with 2–4 screws through the back rail into the wall. Remove those screws. The vanity should pull free from the wall. If it's stuck, work a putty knife behind it to break the caulk seal. Check inside the cabinet for any plumbing that passes through the cabinet bottom or back — disconnect those connections before fully removing the unit. Note the drain stub-out height and position for reference when setting the new unit.
Prepare the Wall and Set the New Vanity Level
Patch any drywall damage from the old vanity. Near the backsplash area, use moisture-resistant drywall (green board). If significant moisture damage is present, inspect for mould before patching. Find studs using a stud finder and mark them. Install the faucet into the vanity top before setting the vanity in place — it's much easier to tighten the faucet mounting nut from below when the top is off the cabinet. Set the new vanity in position, checking level side-to-side and front-to-back. Shim the legs as needed until perfectly level. Mark stud locations on the wall for the mounting screws.
Secure Vanity to the Wall
Drive 3-inch screws through the vanity's back hanging rail into the studs. For floating vanities, the mounting bracket must hit studs — if studs don't land where the bracket requires, install a horizontal 2×6 backer board between two studs before hanging. For freestanding vanities, 2 screws into studs through the back rail is sufficient. Do not over-tighten if the rail is thin wood — you can crack it. Confirm the vanity is still level after tightening.
Connect the Plumbing
Wrap plumber's tape (Teflon tape) clockwise around the threads of the supply line connections before assembling. Hand-tighten, then snug with a wrench — 1/4 turn past hand-tight is sufficient for compression fittings. Do not over-tighten braided stainless lines; the ferrule seals with moderate pressure. Connect the P-trap: the trap arm goes into the wall drain stub-out, and the trap itself connects to the faucet drain tailpiece. PVC slip joints tighten by hand. Turn the angle stop valves back on slowly and watch every connection for drips. Check again 30 minutes later.
Caulk the Base to the Floor
Run a bead of 100% silicone caulk along the base of the vanity where it meets the floor. Smooth with a wet finger. Do not use latex caulk in a bathroom — it will crack and grow mould within a year. Use silicone in a colour that matches the grout or floor. Caulk the vanity top to the wall at the backsplash line as well. Allow caulk to cure for 24 hours before using the sink.
⚠️ Check Every Connection After 30 Minutes — and Again After 24 Hours
Supply line and P-trap leaks often don't appear immediately — they show up after water pressure has been on for 15–30 minutes. After connecting everything and turning the water on, run the faucet for 2 minutes, then check every connection while it's running. Dry off all joints first so a single drop is visible. Check again the next day. A drip from a supply line onto a vanity cabinet floor can go unnoticed for months and cause serious water damage and mould in the wall behind the vanity.
Frequently Asked Questions: Bathroom Vanity Installation
❓ Do I need a plumber to install a bathroom vanity in Ontario?
Not for a straight swap in the same location — disconnecting and reconnecting supply lines and a P-trap is DIY-legal in Ontario. If old supply valves won't close, or if drain lines need relocating, a licensed plumber is required. Budget $200–$400 for plumber connection-only if you're not comfortable with the plumbing portions.
❓ Can I install a vanity on a concrete floor?
Yes. Freestanding vanities work on any flat surface. On concrete, use tapcon screws or concrete anchors if floor anchoring is needed. Many freestanding units on concrete are set in place and caulked at the base. Floating vanities require wall studs or a backer regardless of floor type.
❓ What if the old supply valves won't shut off?
Don't force them. Old angle stop valves in pre-1990 GTA homes often fail when turned after years open. Shut off the main, then call a plumber. A new quarter-turn ball valve runs $150–$250 in labour plus $40–$80 in parts. That's a worthwhile fix before doing any vanity work.
❓ Floating vs freestanding — which is better?
Floating vanities look great and make cleaning easier but require solid stud or backer board anchoring. They start at $1,200–$4,000 for premium 48-inch units. Freestanding vanities ($200–$1,200) are easier to DIY, especially in older GTA homes with plaster walls or unusual stud spacing. Both are valid choices — match the style to your bathroom's existing aesthetic.
❓ How do I fix drywall damage from the old vanity?
Use moisture-resistant drywall (green board) for patches near the backsplash, and cement board for areas within 2 inches of a water source. Fill screw holes and small gaps with pre-mixed joint compound. Prime with a moisture-resistant primer before painting. If tiling the backsplash, wait until the vanity is set and levelled before setting tile.