Why there is no single number
A bathroom with the same footprint can cost very little or a lot, depending on whether fixtures move. Replacing a toilet, vanity and tub in their current spots is mostly connection work. Moving the toilet across the room, adding a second sink or switching to a walk-in shower means new drains, new vents and new supply lines.
That is why we explain the factors and give a clear price after seeing the room. Any online figure ignores the pipes in your walls.
The main cost drivers
Read a quote against this table. Anything left out can reappear as an extra.
| Factor | Lower cost | Higher cost |
|---|---|---|
| Fixture locations | Fixtures stay in place. | Toilet, tub or vanity moves. |
| Shower or tub valve | Replace the trim only. | New valve body in the wall. |
| Drains and vents | Existing drains reused. | New drains cut into floors. |
| Access | Open walls and floors during remodel. | Finished ceilings below, slab, tile. |
| Pipe condition | Sound copper or PEX. | Corroded galvanized or leaking joints. |
| Fixture choice | Standard faucets and toilet. | Specialty shower systems, wall-hung toilets. |
| Permit and inspection | Straightforward job. | Code upgrades discovered. |
The shower valve decision
A shower valve sits in the wall, so replacing it is cheapest while the wall is open. Putting in a new valve during a remodel avoids opening finished tile later. If your valve is old or the trim is obsolete, replace it now.
Ask whether the quote includes the valve body, the trim and a pressure-balancing or thermostatic valve, which protects against scalding. Our faucet and fixture repair page covers smaller valve fixes that do not need a remodel.
A realistic remodel sequence
Plumbing happens in two visits. Rough-in comes first, after demolition and before walls close. The finish visit comes last, after tile and paint, when fixtures are set and connected. Between the two, the inspector signs off on the rough work.
Delays often happen because fixtures are not on site when the plumber arrives. Order faucets, valves and the toilet early and keep the specification sheets, so the plumber can check rough-in dimensions.
Tell the plumber about any plans for a heated floor, a bidet or a second shower head, because each affects the supply and drain layout. Changes after the walls close cost more.
Want a real bathroom number?
Call and describe the project. We will explain the likely work and give a clear price before it starts.
Permits and licensed plumbers in Vernon Hills
The Village of Vernon Hills building department, at 290 Evergreen, handles permits and inspections. Its published permit guide covers water heater and sewer work in detail. For a bathroom remodel, call 847-367-3700 to confirm what your project needs before you hire.
Plumbers in Illinois are licensed through IDPH, which offers a plumbing license verification lookup. Check any contractor you are considering, and ask who pulls the permit.
Source type: Village of Vernon Hills building department and IDPH plumbing license verificationWhat can go wrong behind the wall
Old galvanized supply lines clog with rust and can break when disturbed. Cast iron drains crack. A leaking joint can hide under a tub for years. Opening a wall may uncover rot or mold that needs fixing before the new work goes in.
That is why we recommend a contingency in the budget. If the supply pipes are in bad shape, our repiping page explains the options. If you suspect a hidden leak, leak detection can find it before the tile goes up.
Ways to keep the price in check
Keep fixtures where they are if the layout works. Pick standard sizes and common finishes. Supply the fixtures yourself if you have a good source, and confirm that the plumber will install customer-supplied items.
Combine the project with other plumbing work in the same visit, such as replacing old shutoff valves, to avoid a second trip. Ask for a written scope and keep a small reserve for surprises in the wall.
How to compare bathroom plumbing quotes
Ask each plumber to list the same scope: fixtures supplied by whom, valve type, drain changes, venting, permit, haul-away and warranty. Ask about the allowance for surprises and how changes are priced.
A good quote is specific and written. We give a clear price before work starts and talk through any change before it happens. For homes in Mundelein or nearby towns, the process is the same.
Rules and guidance note
Moving fixtures or drains is plumbing work that usually needs a permit under local rules based on the Illinois State Plumbing Code. Ask the Village of Vernon Hills building department at 847-367-3700 about your project.
We do not give dollar figures we cannot verify, so use written quotes to compare.
Bathroom plumbing cost questions
Whether fixtures move. New drain and vent routes cost far more than swapping fixtures in place.
Usually yes. The wall is open, and a new valve avoids tearing out finished tile later.
Plumbing changes normally do. Call the building department at 847-367-3700 to confirm for your project.
Often yes. Tell the plumber early so they can check that parts fit and that the warranty is clear.
Look for rust-colored water, low pressure and pinhole leaks. A plumber can inspect the supply lines when the wall is open.