Renovating a bathroom costs an average of $4,000 to $9,500 if you do it yourself, and $9,500 to $24,000 if you hire a contractor. The difference lies entirely in labor — and that is substantial for a bathroom. In this guide, you will learn exactly how to renovate your bathroom step by step, what the costs are per component, and which mistakes you absolutely must avoid. Whether you are planning a complete renovation or just want to freshen up a small bathroom: this is the complete guide.
What Does a Bathroom Renovation Cost? DIY vs. Contractor
Costs per Component
| Component | DIY (materials) | Contractor (materials + labor) |
|---|---|---|
| Demolition | $0 – $120 (dumpster) | $480 – $960 |
| Plumbing (water + drain) | $240 – $600 | $960 – $1,800 |
| Electrical | $120 – $360 | $480 – $960 |
| Waterproofing | $180 – $360 | $480 – $840 |
| Underfloor heating | $240 – $600 | $600 – $1,200 |
| Tiling (floor + walls) | $720 – $1,800 | $1,800 – $4,200 |
| Fixtures (toilet, vanity, shower/tub) | $960 – $3,600 | $1,440 – $4,800 |
| Ceiling | $120 – $360 | $300 – $720 |
| Finishing (caulk, trim, accessories) | $120 – $300 | $240 – $600 |
Total Costs by Bathroom Type
| Bathroom Type | DIY | Contractor |
|---|---|---|
| Small bathroom (< 45 sq ft) | $3,000 – $6,000 | $7,200 – $14,400 |
| Average bathroom (45–65 sq ft) | $4,000 – $9,500 | $9,500 – $21,600 |
| Large bathroom (> 65 sq ft) | $6,000 – $14,400 | $14,400 – $30,000 |
| Luxury bathroom (fully loaded) | $9,600 – $21,600 | $21,600 – $42,000 |
When Is DIY Worth It?
Doing it yourself saves you 40–60% of the total cost. The biggest savings are in tiling ($45–$70/hour labor costs for a tile setter) and demolition (pure sweat equity). But there are limits. Plumbing should be done by a licensed plumber in most jurisdictions. Electrical work in wet areas must meet strict code requirements and needs to be inspected. The rest — demolition, waterproofing, tiling, installing fixtures, finishing — you can do yourself.
Realistic scenario: You handle demolition, waterproofing, tiling, fixture installation, and finishing yourself. You hire out plumbing and electrical. That still saves you $3,500 to $9,500 compared to hiring everything out.
Timeline: How Long Does a Bathroom Renovation Take?
Do not underestimate the duration. A bathroom renovation takes longer than most people think, mainly because of drying times in between.
| Phase | Duration (DIY) | Duration (contractor) |
|---|---|---|
| Demolition | 1–2 days | 1 day |
| Plumbing + electrical | 1–2 days (professional) | 1–2 days |
| Waterproofing (application + drying) | 2–3 days | 1–2 days |
| Underfloor heating installation | 1 day | 0.5 day |
| Screed pouring + drying | 1 day work + 3–7 days drying time | Same |
| Tiling floor + walls | 3–5 days | 2–3 days |
| Grouting | 1 day + 1 day drying time | 1 day |
| Fixture installation | 1–2 days | 1 day |
| Finishing | 1 day | 0.5 day |
| Total | 3–5 weeks | 2–3 weeks |
Important: Plan the renovation so that you have an alternative shower or washing facility. Think of neighbors, a gym, or a temporary outdoor shower. A bathroom is unusable for 3–5 weeks during renovation.
Preparation: What Do You Need?
Materials List (Average Bathroom, 55 sq ft)
| Material | Quantity | Estimated Price |
|---|---|---|
| Floor tiles (13×13 or 24×24 in) | 65–75 sq ft (incl. 10% waste) | $180 – $480 |
| Wall tiles (12×24 or 24×24 in) | 160–215 sq ft | $360 – $960 |
| Tile adhesive (flex adhesive) | 4–5 bags of 55 lbs | $72 – $120 |
| Grout | 2–3 bags of 11 lbs | $24 – $48 |
| Liquid waterproofing membrane | 22–33 lbs | $96 – $180 |
| Sealing tape | 33–50 ft | $24 – $48 |
| Primer | 1.3 gallons | $30 – $48 |
| Electric underfloor heating mat | 45–55 sq ft | $240 – $480 |
| Self-leveling compound | 5–8 bags of 55 lbs | $60 – $120 |
| Silicone caulk (mold-resistant) | 3–5 tubes | $18 – $36 |
| PVC pipe + fittings | As needed | $36 – $96 |
| Fixtures (toilet, vanity, shower set) | 1 set | $720 – $3,000 |
Total materials: $1,860 – $5,620
Tools
| Tool | Buy/Rent | Estimated Price |
|---|---|---|
| Manual tile cutter (24 in) | Buy | $36 – $96 |
| Angle grinder with diamond blade | Buy or rent | $48 – $96 (buy) / $24/day (rent) |
| Drill with mixing paddle | Buy | $48 – $96 |
| Notched trowel (1/4″ or 5/16″) | Buy | $6 – $12 |
| Level (24 in + 48 in) | Buy | $18 – $36 |
| Tile spacers (1/16″ or 1/8″) | Buy | $6 – $12 |
| Caulk gun + caulk tool | Buy | $12 – $24 |
| Sponge and bucket | Buy | $6 – $12 |
| Pry bar + mini sledge (demolition) | Buy or rent | $24 – $48 |
| Shop vacuum (construction dust) | Rent | $30 – $48/day |
Step-by-Step Guide: Renovate a Bathroom in 10 Steps
Step 1: Plan and Design Your Bathroom
Before you demolish anything: create a detailed plan.
- Measure the room precisely. Length, width, height, position of window, door, existing plumbing. Draw everything to scale (1:20).
- Determine the layout. Where will the shower, toilet, and vanity go? Account for existing connection points — relocating plumbing is expensive.
- Choose your materials. Tiles, fixtures, faucets, shower system. Order everything well in advance — lead times of 2–6 weeks are normal.
- Plan the sequence and coordinate with plumber/electrician. Schedule appointments before you start demolition.
Tip for small bathrooms (< 45 sq ft): Use large-format tiles (24×24 inches or larger) with thin grout lines. Large tiles make a small space look bigger. Choose light colors for the same effect. A walk-in shower with a glass panel saves space compared to an enclosed shower stall.
Step 2: Strip the Bathroom
Now it gets dusty and loud. Protect the rest of your home.
- Shut off water and electricity to the bathroom. Mark which pipes and wires go where before you start.
- Remove fixtures. Toilet, vanity, tub, or shower enclosure. Temporarily plug the drain pipes to prevent sewer gas.
- Remove the tiles. Use a pry bar and mini sledge, or a rotary hammer with chisel for larger areas. Start at the top of the wall and work downward.
- Remove the old floor down to the concrete subfloor. If the floor is in good condition and level, you can lay the underfloor heating directly on it.
- Clear away the debris and dispose of it. Rent a dumpster ($180–$300 per load) — tile waste cannot go in regular trash.
Common mistake: Damaging pipes during demolition. Work carefully around existing pipes. Mark them with tape or paint before you start chipping.
Step 3: Plumbing and Electrical
This is the moment for the plumber and electrician.
- Have the water lines adjusted to the new layout. Hot and cold supply, drains for shower, vanity, and toilet.
- Have the electrical adjusted. Think about: GFCI outlets, recessed lighting, exhaust fan, underfloor heating connection.
- Test all connections before closing things up. Have the plumber perform a pressure test on the water lines.
Electrical zones in the bathroom: The bathroom is divided into zones (0, 1, 2) with strict requirements about what may be installed where. In zone 0 (inside the shower/tub) almost nothing is permitted. In zone 1 (directly above shower/tub, to 7.5 ft high) only low-voltage equipment. In zone 2 (24 inches around zone 1) GFCI-protected outlets. Have a licensed electrician assess this.
Step 4: Install Underfloor Heating
Underfloor heating in the bathroom is pure luxury that costs relatively little. Electric heating mats are the easiest option for a renovation.
- Check that the subfloor is level. Maximum 1/8″ height difference per 3 feet. Not level? Level first with self-leveling compound.
- Roll out the heating mat according to the manufacturer’s instructions. Not under the toilet and not under cabinets — only on open floor areas.
- Connect the thermostat (or have the electrician do this). The thermostat goes outside the bathroom or in zone 2.
- Test the mat with a multimeter before pouring the screed over it. A defect after tiling is a disaster.
- Pour a thin layer of self-leveling compound (1/4″–5/16″) over the heating mat. Let dry for at least 24 hours.
Underfloor heating costs: An electric heating mat of 45 sq ft costs $240–$480 including thermostat. Electricity consumption is about $3–$5 per month with normal use (1–2 hours daily). For hydronic underfloor heating (more expensive to install, cheaper to run) you need a professional installer.
Step 5: Waterproofing
This is the most important step of the entire renovation. A leak due to poor waterproofing causes thousands of dollars in damage to the structure and the floor below.
- Apply primer to all surfaces that need waterproofing: shower floor, shower walls (full height), around the vanity (at least 12 inches above the vanity), and the first 4–6 inches of all walls above the floor.
- Apply sealing tape in all corners and joints: floor-wall transitions, corners of shower walls, around pipe penetrations. Sealing tape reinforces the membrane at vulnerable points.
- Apply the first coat of liquid waterproofing membrane with a roller or brush. Work the sealing tape into the wet membrane.
- Let dry for 4–6 hours (depending on temperature and ventilation).
- Apply the second coat, perpendicular to the first. Total layer thickness must be at least 40 mils (check product specifications).
- Let cure for 24 hours before tiling.
Common mistake: Only waterproofing the shower floor. The entire wet zone must be waterproofed: floor, walls in the shower up to the ceiling, and the first 4–6 inches of all other walls. Do not skip the vanity area — splash water causes more moisture damage than you would think.
Step 6: Tile the Walls
Always start with the walls before tiling the floor. This way the floor tiles butt against the base of the wall tiles, which gives a neater joint and is better waterproofed.
- Determine your starting point. Measure the wall height and plan the tile layout so you do not end up with a narrow strip at the top or bottom. Start with the second row from the bottom — you will cut the first row to fit later.
- Screw a straight batten (aluminum profile or wood strip) horizontally to the wall as support for the second row of tiles. Check with a level.
- Mix the flex adhesive according to the instructions. Always use flex adhesive in the bathroom — standard tile adhesive is not suitable in combination with a waterproofing layer.
- Apply adhesive to the wall with a notched trowel of 1/4″ or 5/16″ (depending on tile size). Work in sections of no more than 10 sq ft.
- Press the tile into the adhesive with a slight twisting motion. Use tile spacers (1/16″ or 1/8″) for even grout lines.
- Check regularly with a level that the tiles are flat. Tap tiles into place with a rubber mallet.
- Cut tiles to size with a tile cutter (straight cuts) or angle grinder with diamond blade (corners, cutouts for pipes).
Work tip: Work from bottom to top, maximum 4–5 rows at a time. More rows at once and the bottom rows will sag under the weight.
Step 7: Tile the Floor
- Check that the floor is level. Lay a long level or straightedge on the floor. Maximum 1/8″ difference per 6 feet. Not level? Level it.
- Determine your tile pattern and starting point. In a rectangular room, you usually start from the center so that the cut tiles along the edges are equal.
- Apply flex adhesive to the floor with a notched trowel of 5/16″ or 3/8″ (floor tiles are thicker).
- Lay the tiles with spacers. Work toward the door so you do not trap yourself.
- Create slope toward the drain in the shower. At least 1/4 inch per foot toward the drain. This is critical — without slope, water pools.
- Let the adhesive cure for 24 hours before walking on it.
Common mistake: No slope in the shower. Water that does not drain sits permanently on the grout joints and waterproofing layer. Even a small lack of slope is something you notice every day.
Step 8: Grouting
- Mix the grout to a thick, smooth paste. Use grout that is suitable for wet areas (water-repellent).
- Work the grout into the joints with a rubber grout float. Work diagonally across the joints.
- Remove excess grout with a damp sponge as soon as the joints begin to set (after 15–30 minutes). Not too wet — you will wash the grout out of the joints.
- Let cure for 24–48 hours before the joints come into contact with water.
Step 9: Install Fixtures
- Mount the toilet. For a wall-hung toilet, the concealed cistern is already behind the wall (installed in step 3). Attach the toilet bowl to the wall brackets, connect the drain, and install the flush plate.
- Install the vanity. Mount the vanity or cabinet to the wall, connect the trap and faucet. Use flexible supply lines.
- Install the shower. Mount the shower valve (or thermostatic mixer), the showerhead, and optionally a glass shower panel. Check that all connections are watertight.
- Test all connections. Run everything for an hour and check for leaks at every connection.
Step 10: Finishing and Caulking
The final step makes the difference between an amateur and a professional finish.
- Caulk all joints between fixtures and tiles with mold-resistant silicone caulk. Use painter’s tape on both sides of the seam for a clean caulk line.
- Caulk the corners where wall and floor tiles meet. These are caulk joints, not grout joints — caulk is flexible and accommodates movement.
- Install accessories: towel bar, soap dish, toilet paper holder, medicine cabinet, ventilation grille.
- Install the ceiling if you have not already. A PVC panel ceiling is moisture-resistant, easy to install, and costs $60–$180 per bathroom.
- Clean everything and remove the painter’s tape from the caulk.
Caulking tip: Cut the tip of the caulk tube at a 45-degree angle. Pull the caulk gun in one smooth motion along the seam. Remove the painter’s tape while the caulk is still wet. Use your finger or a caulk tool moistened with soapy water to smooth the caulk bead.
Common Mistakes in Bathroom Renovation
| Mistake | Consequence | Solution |
|---|---|---|
| Skip or half-do the waterproofing | Moisture damage to structure, mold, leaks to floor below | Full liquid waterproofing membrane + sealing tape in all corners and joints |
| Not using flex adhesive | Tiles come loose on the waterproofing layer | Always use flex adhesive in wet areas |
| No slope in the shower | Standing water, mold growth, odor issues | At least 1/4 inch slope per foot toward the drain |
| Doing everything yourself including electrical and plumbing | Unsafe situation, insurance risk, no inspection approval | Electrical and plumbing connections by licensed professionals |
| Using cement grout in corners | Cracks from building movement | Always caulk corners and joints, never grout them |
| Tiling too soon after waterproofing | Waterproofing layer not cured, loses function | Wait at least 24 hours after the second coat |
| Only budgeting for materials | No money left for plumber, electrician, or unexpected costs | Plan 15–20% extra budget for the unexpected |
Tips for Renovating a Small Bathroom
A small bathroom (< 45 sq ft) requires smart choices. With the right design, a small bathroom can feel much larger than it is.
- Use large-format tiles. Fewer grout lines = calmer look = feels bigger. Tiles of 24×24 inches or 24×48 inches are ideal.
- Choose a walk-in shower. No shower enclosure with doors — a glass panel of 32–36 inches wide is enough and looks much more spacious.
- Go for a wall-hung toilet. The floor continues under the toilet, making the space look larger. Cleaning is easier too.
- Choose a narrow vanity. A 24-inch vanity instead of 30 inches makes a surprisingly big difference.
- Use a large mirror. A mirror spanning the full width of the vanity wall visually doubles the space.
- Think vertical. Tall narrow cabinets, wall niches in the shower (recessed into the wall), and wall-mounted fixtures use height without claiming floor space.
Frequently Asked Questions About Bathroom Renovation
What does a complete bathroom renovation cost?
DIY: $4,000 to $9,500 for an average bathroom of 55 sq ft, including fixtures, tiles, and materials. By a contractor: $9,500 to $24,000. The exact costs depend on your choices in fixtures (budget vs. luxury), tile type, and whether you want underfloor heating.
How long does a bathroom renovation take?
Expect 3–5 weeks if you do it yourself (including drying times) and 2–3 weeks with a contractor. The longest wait times are for drying the waterproofing, the screed, and the grout.
Can I renovate my bathroom as a beginner?
Yes, as long as you hire out the plumbing and electrical work to licensed professionals. Demolition, waterproofing, tiling, and fixture installation can be done by an experienced DIYer. Have you never tiled before? Practice on a small area first (e.g., a laundry room or powder room) before tackling the bathroom.
Do I need a permit for a bathroom renovation?
In most cases, no. An interior renovation where you do not alter the load-bearing structure or the exterior facade is typically permit-free. If you are relocating the bathroom to a different room (e.g., converting a bedroom), a permit may be required. Check with your local building department.
Do I have to strip everything or can I tile over existing tiles?
Tiling over existing tiles is possible, provided the substrate is flat and solid and the tiles are firmly adhered. Use a bonding primer and flex adhesive. Note: you are building up height (about 3/8″–5/8″ per layer), which can cause problems at the door, toilet, and drain. When in doubt: strip down to the substrate. It is more work but delivers a better result.
What order should I follow for tiling?
Always walls first, then the floor. The floor tiles butt against the bottom of the wall tiles. This is neater and better waterproofed. On the walls, work from bottom to top, and on the floor, work from the farthest corner toward the door.
Building Plans and Guides
Ready to get started with professional building plans and step-by-step guides? Check out the complete building plans package at fredsdiyplans.com — with thousands of plans for every DIY project.
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