How long does a bathroom remodel take?

HomeGuide gives 3 to 8 weeks for a bathroom remodel (retrieved August 23, 2026). Design, permit review and fixture lead times come before that. The timeline planner adds them up.

What does moving a toilet add?

Only a bid can say. The drain has to fall to the stack with a vent, which can mean cutting a slab or joists. Ask for the move as its own line and type it in the layout box.

Do I need a permit to remodel a bathroom?

Tile and a vanity cabinet are finish work the IRC exempts. Replacing or moving fixtures, drains, vents or circuits is plumbing or electrical work that can need a permit. Your building department decides.

What does code say about a bathroom fan?

IRC R303.3 asks for a window of 3 sq ft, half openable, or a fan of 50 cfm intermittent or 20 cfm continuous, discharging outdoors. Your city adopts and can amend the code.

Does a pre-1978 house change the job?

Yes. Paid work that disturbs more than 6 sq ft of paint per room needs an EPA Lead-Safe Certified firm. Tearing out a bathroom passes that quickly, so ask each bidder for the certificate.

Should I add a contingency?

That is your call, and the box starts at 0. It is money you hold outside the contract for what demolition finds under the floor or behind the walls.

HyreRemodel tools

Bathroom remodel cost calculator

Type the floor area, pick a HomeGuide scope band, then add the two lines a bid prices on its own: moving the toilet or a wet wall, and separate waterproofing.

$100–$500 per square foot, from a minor refresh to a full remodel HomeGuide, “How Much Does a Bathroom Remodel Cost?”, retrieved August 23, 2026: minor $100–$150, partial $150–$300, full $250–$500 per square foot.

Bathroom remodel cost = floor area × a price per square foot for the scope, plus moving the toilet or a wet wall, plus any waterproofing priced on its own. A 40 sq ft full remodel at HomeGuide’s $250 to $500 per square foot is $10,000 to $20,000 before those lines.

Work out your bathroom

Arithmetic on your figures. Nothing is stored or emailed.

— Budget on your figures

— Per square foot

— Layout

— Waterproofing

What this assumed —

A check on a bid, not a quote. What demolition finds pushes a real price up.

Settle these before the old bathroom comes out

Built before 1978? Paid work that disturbs more than 6 sq ft of paint per room needs an EPA Lead-Safe Certified firm (40 CFR Part 745, Subpart E). Tearing out a bathroom passes that quickly.

Old floor tile, mastic or ceiling texture. These can contain asbestos. Have them tested before demolition, not after.

Joists and walls. Recessing a floor for a curbless shower or cutting joists for a new drain is structural work. It needs a permit, and your building department can require an engineer.

Water and wiring. New circuits, a heated floor or a moved fan are licensed electrical work under a permit.

Worked examples

Two bathrooms run through the calculator

A full remodel, layout kept

40 sq ft at HomeGuide’s full-remodel band of $250 to $500 per square foot, with no extra lines: $10,000 to $20,000.

A partial remodel that moves the toilet

40 sq ft at the partial band ($150 to $300) is $6,000 to $12,000. Add $2,500 from a bid to move the toilet and 15% contingency: $9,775 to $16,675.

Budget = area × the scope’s $/sq ft + layout + waterproofing, then contingency. The bands are HomeGuide’s, retrieved August 23, 2026. The $2,500 is an example; type your bid’s figure.

The work you will not see once the tile is on

Each row is covered up before the job ends. Ask about it while it can still be seen.

Item	What to ask	Why it matters
Waterproofing	Which system, by name, and whether its corners, seams and pipe collars come from the same maker	A leak behind tile is found late, and fixing it means removing the tile.
Backer behind the tile	What board goes behind tile in the wet areas	Plain drywall in a shower is a question to raise before it is covered.
Ventilation (IRC R303.3)	A window of 3 sq ft, half of it openable, or a fan of 50 cfm intermittent or 20 cfm continuous	The fan must discharge outdoors, not into the attic or a crawl space.
Drains and vents	Whether new fixture positions reach the stack with enough fall and venting	This is where a moved toilet gets expensive.
Blocking	Wood blocking behind any future grab bar, seat or wall-hung sink	It goes in during framing. Later, the wall has to be opened.
Curbless shower floor	How the floor is recessed or built up to make the slope	That is framing, decided before any tile is chosen.

Ventilation figures from the 2021 International Residential Code. Your city adopts and can amend it.

Does the toilet move?

Fixtures in the same place make the job a replacement. Moving one reroutes pipe.

Why it costs more. A toilet drain is larger than a sink’s and has to fall steadily to the stack, with a vent. On a slab, that means cutting concrete. Over a wood floor, it can mean cutting or doubling joists.

What to ask. Ask each bidder to price the move as its own line, and what happens if the slab or joists are not what they expect. Type that figure in the layout box above.

The permit. Rearranging drains and vents is plumbing work that the model code puts under a permit, inspected before the walls close. Check with the permit checker, then your building department.

What a bathroom bid should state in writing

The waterproofing system by name
Not “waterproof shower”. A maker and a product.
Whether any fixture moves
Toilet, shower, tub, sink: each move as its own line.
The fan, with a cfm rating
At least 50 cfm intermittent or 20 cfm continuous, discharging outdoors.
Tile and fixture allowances in dollars
And whether the tile allowance assumes a simple layout or the pattern you chose.
Fixtures on site before demolition
A bathroom stalled mid-job waiting for a valve is a bathroom you cannot use.
Inspection points in the schedule
Rough plumbing and electrical are inspected before anything is covered.
“Tile over the existing drywall”
In a wet area, ask what goes behind the tile and why.
A large deposit before anything is ordered
Check your state’s deposit limit and tie payments to progress.

What the calculator leaves out

What is under the floor. Rot around the old toilet flange or a slow leak is found at demolition. It pushes a bid up, not down.

Your market. HomeGuide’s bands pool quotes nationally. Type the rate from your own bids when you have them.

Resale. The calculator prices the work. It says nothing about what the bathroom adds to the house: for that, see the remodeling ROI calculator.

Questions this calculator answers

How much does a bathroom remodel cost?: HomeGuide’s bands run from $100 per square foot for a minor refresh to $500 for a full remodel (retrieved August 23, 2026). Multiply by your floor area, then add moving any fixture and separate waterproofing from your bid.
How long does a bathroom remodel take?: HomeGuide gives 3 to 8 weeks for a bathroom remodel (retrieved August 23, 2026). Design, permit review and fixture lead times come before that. The timeline planner adds them up.
What does moving a toilet add?: Only a bid can say. The drain has to fall to the stack with a vent, which can mean cutting a slab or joists. Ask for the move as its own line and type it in the layout box.
Do I need a permit to remodel a bathroom?: Tile and a vanity cabinet are finish work the IRC exempts. Replacing or moving fixtures, drains, vents or circuits is plumbing or electrical work that can need a permit. Your building department decides.
What does code say about a bathroom fan?: IRC R303.3 asks for a window of 3 sq ft, half openable, or a fan of 50 cfm intermittent or 20 cfm continuous, discharging outdoors. Your city adopts and can amend the code.
Does a pre-1978 house change the job?: Yes. Paid work that disturbs more than 6 sq ft of paint per room needs an EPA Lead-Safe Certified firm. Tearing out a bathroom passes that quickly, so ask each bidder for the certificate.
Should I add a contingency?: That is your call, and the box starts at 0. It is money you hold outside the contract for what demolition finds under the floor or behind the walls.

Sources and methodology

Figures dated August 23, 2026. Last reviewed August 16, 2026.

How Much Does a Bathroom Remodel Cost? (HomeGuide, retrieved August 23, 2026). Scope bands per square foot and the 3 to 8 week duration. Member-reported quotes.
Bathroom ventilation, IRC R303.3 (2021 model code) (International Code Council, via Jaspector, retrieved September 5, 2026). Window or fan sizes; exhaust outdoors.
Lead Renovation, Repair and Painting Program (US Environmental Protection Agency, retrieved September 5, 2026). 40 CFR Part 745, Subpart E: the 6 sq ft threshold and certified firms.

Bathroom remodeling Waterproofing, the trades and what goes in the scope.
Kitchen remodel cost calculator Cabinets by the linear foot, plus the bid lines.
Remodeling timeline planner Design, permits and lead times before the 3 to 8 weeks on site.
Permit checker How the model code treats fixture swaps and moves.
Quote comparison worksheet Six written items to check on every bid.
What remodeling costs What moves a remodeling price.

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