How to Estimate a Bathroom Remodel (2026 Guide)

Bathrooms are the smallest rooms you'll remodel and some of the easiest to lose money on. Every expensive trade shows up in fifty square feet, and most of the risk hides behind tile. Here's how to estimate one properly.

Published August 2, 2026 · Written for US contractors who estimate their own jobs

Typical bathroom remodel ranges

Start by placing the project in a budget tier so you and the client are talking about the same job. Typical ranges vary by region — labor in major metros runs well above rural markets — but most US bathroom remodels land roughly here:

Per square foot, bathrooms are the most expensive rooms in the house — the room is tiny but it contains a drain system, supply lines, ventilation, waterproofing, tile, an exhaust fan, and GFCI-protected electrical. Use the tiers to catch a mismatch early: if the client describes an upscale scope with a refresh budget, resolve that before you invest hours in a detailed estimate.

Step 1: Scope the job with a checklist

Walk the room and force a decision on every item, the same way you would on a kitchen estimate:

• Demolition: gut to studs or selective? Cast-iron tub removal (heavy, sometimes cut in place)? Mud-set tile floors, which demo slow and heavy? Disposal and dumpster.
• Tub / shower: keep, replace in kind, convert tub-to-shower, or relocate? Prefab unit vs. tiled? Curb or curbless? Glass enclosure — framed, semi-frameless, frameless?
• Plumbing: are the toilet, vanity, and valve staying where they are? Valve replacement, supply line condition (galvanized pipe in older homes), shutoffs, drain condition.
• Electrical: GFCI circuits, exhaust fan (new or upgraded, with proper exterior venting), vanity lighting, heated floor circuit, outlet count to current code.
• Waterproofing: the system you'll use and where it extends — this is a named scope item, not something buried inside "tile."
• Tile: floor and wall areas, tile size and pattern, niches and benches, edge trim, grout and movement joints.
• Vanity & counters: stock, semi-custom, or custom; top material; mirrors and medicine cabinets.
• Flooring, drywall & paint: substrate condition, moisture-resistant board in wet areas, ceiling paint, door and trim work.
• Fixtures & accessories: who supplies the toilet, faucets, and hardware — you or the client? Allowances for anything unselected.

Add the outside-the-room items: permits, venting runs through the attic or roof, and access — a third-floor bathroom with a narrow stair changes your demo and material-handling labor.

Step 2: Measure and take off the quantities

The takeoff is small but unforgiving, because a missed wall of tile is a real percentage of the job:

• Floor area (tile, underlayment, heated-floor mat if specced).
• Wet-wall tile area — measure each shower wall and the tub deck separately, to the specified height, and add niches and benches as their own line.
• Other wall area for drywall and paint.
• Counts: fixtures, valves, outlets, lights, fan, glass panels, accessories (towel bars and grab bars get blocking, which is a framing task).
• Waste factors: tile commonly carries around 10% waste, more for diagonal, herringbone, or large-format layouts with small rooms.

Photograph the plumbing under the vanity, the panel, and the attic space above the bath if you can reach it. If you have plans or even a sketch, this is where software earns its keep: BuildCraft Pro's AI blueprint takeoff reads the drawing and drafts trade-organized line items with quantities, which you then check against your site measurements instead of typing from zero.

Step 3: Price the wet-area work like the specialty it is

What separates bathroom estimates from other rooms is the wet area. Three items deserve their own attention:

Waterproofing

Price a complete system, not a product: backer board or foam board, sheet or liquid-applied membrane, a sloped pan (mud bed or preformed), sealed penetrations and corners, and a flood test where your inspector wants one. It's a modest line next to tile, but it's the line that prevents the callback that costs you a whole bathroom. If a client pushes to cut cost, this is the item you defend.

Tile labor

Tile is priced by the square foot plus complexity. Small mosaics, large-format panels, niches, benches, mitered edges, and pattern layouts all push labor up — sometimes past the cost of the tile itself. Price floor tile, wall tile, and specialty details as separate lines, and include setting materials (thinset, leveling clips, trim profiles, grout, sealant) rather than absorbing them.

Plumbing rough-in moves

The cheapest bathroom keeps every fixture where it stands. Moving a vanity a couple of feet is usually manageable; relocating the shower valve means opening walls; moving the toilet is typically the most expensive single move, because the drain and venting have to be re-run under the floor — and far more so over a slab, where concrete gets cut. Get your plumber's number for any relocation before the estimate goes out, and show the client the cost difference between "keep the layout" and "move the toilet" as options. It wins trust and often saves the budget.

Step 4: A sample line-item structure

Here's a simplified midrange hall-bath example, organized by trade. Numbers are illustrative only — use your local labor rates and current supplier quotes:

Note the glass door carried as a labeled allowance — enclosures are measured and quoted after tile is up, so an allowance keeps the estimate honest without leaving the item out.

Step 5: Split labor and materials

Bathrooms run more labor-heavy than kitchens: there's no $15,000 cabinet package to inflate the materials side, and the hours go into tile setting, waterproofing, and fixture work. Depending on scope and region, labor commonly lands around a third to half of the direct cost of a full bathroom remodel. Price the two sides separately:

• Labor: hours per task at your fully loaded rate — wages plus payroll taxes, workers' comp, and insurance. Tile hours deserve special care; a niche or a herringbone floor can quietly add a day.
• Materials: current supplier quotes with waste factors, including the setting materials and waterproofing components that are easy to leave out.
• Subs: written quotes for plumbing, electrical, and glass — especially any rough-in relocation, which is exactly the number you don't want to guess.

Step 6: Markup and contingency

The math is the same as any remodel: direct costs first, then overhead (commonly 10–20%) and profit (commonly 10–20%) on top, calculated from your own books rather than a rule someone gave you. Carry a 10–15% contingency, and lean high on bathrooms — more than most rooms, their problems are invisible until demo. Rot under a tub, a corroded galvanized supply, an unvented drain from a previous "remodel": none of it shows in a walkthrough. Pair the contingency with a written change-order process so genuine surprises become signed changes, not margin leaks. The full breakdown of markup, margin, and contingency math is in our guide to writing a construction estimate.

Common bathroom estimating mistakes

• Burying waterproofing inside the tile line — then feeling pressure to cut it when the bid needs trimming.
• Pricing tile labor flat regardless of tile size, pattern, or niche count.
• Assuming the subfloor is fine. Around tubs and toilets, assume you'll find something; that's what contingency is for.
• Forgetting ventilation. A new fan often needs a new exterior duct run — attic work that never made the walkthrough notes.
• Vague fixture responsibility. Client-supplied fixtures arrive late, damaged, or missing rough-in valves. Say in writing who supplies what and what happens when it's wrong.
• No allowance discipline. Unselected tile priced as "TBD" becomes an argument; a labeled allowance with a stated unit price becomes a simple adjustment.

Frequently asked questions