Bathroom Renovation Guide: Plan, Budget, and Build Your Dream Bath

Planning and Layout

Layout decisions lock in your plumbing budget. Every fixture you move adds $500 to $1,500 in rough-in plumbing costs. Before buying a single tile, map your bathroom on graph paper with accurate measurements and identify the plumbing wall.

Critical Measurements

Measure your bathroom twice before ordering anything. Record the total square footage, then check these clearances: doors need 24 inches of swing clearance minimum; the toilet requires 15 inches from its centerline to any wall or obstruction on either side, plus 30 inches of clear space in front; the vanity needs 30 inches of clear floor space in front of the cabinet; and a shower stall must be at least 32x32 inches, though 36x36 inches provides comfortable turning room for most adults. If your bathroom is under 5x8 feet, consider a pedestal sink instead of a vanity to preserve floor space, or a pocket door instead of a swinging door to reclaim square footage.

Identify the Plumbing Wall

The plumbing wall carries the supply lines (hot and cold water) and drain-waste-vent (DWV) pipes. In most bathrooms, this wall sits behind the toilet and vanity. Look for the access panel on the wall opposite the shower or tub, or check the basement ceiling below for pipe routing. Moving a toilet, sink, or shower to a different wall requires opening the wall, running new supply lines and drain pipes, and patching the original locations. Expect to pay $500 to $1,500 per fixture relocated. If your budget is tight, keep every fixture on the existing plumbing wall and spend the savings on better materials.

Ventilation Requirements

Building code requires an exhaust fan rated at 50 CFM for bathrooms under 100 square feet, and 1 CFM per square foot for larger bathrooms. An undersized fan leaves humidity trapped in the room, which feeds mold growth behind tile and inside wall cavities. The Panasonic WhisperCeiling 110 CFM model ($130-$160) runs at 0.3 sones, making it quiet enough that most homeowners forget it is on. Duct the fan to the exterior with rigid metal ductwork, not flexible vinyl, which traps moisture and restricts airflow. The duct run should be as short and straight as possible, with no more than one elbow.

Permits

Most municipalities require permits for any plumbing or electrical changes, which covers virtually every bathroom remodel. Permit fees range from $100 to $300 depending on your jurisdiction. Skipping permits creates three problems: your homeowner's insurance can deny claims for water damage or electrical fires in an unpermitted bathroom, buyers will flag unpermitted work during inspections when you sell, and the city can levy fines that exceed the original permit cost. Pull the permits. The inspection process also catches code violations that could cause real harm, such as improper grounding on a GFCI circuit or an inadequate drain slope.

Budget Breakdown for a 5x8 Bathroom ($8,000-$12,000 Mid-Range)

These numbers come from actual project costs on remodels completed between 2024 and 2026. Your location, material choices, and whether you hire out or DIY will shift these figures, but the proportions remain consistent across most markets.

The biggest cost drivers are tile and plumbing changes. A full tile shower with a frameless glass door can consume 25-30% of your total budget by itself. If you need to stay under $10,000, consider a direct-to-stud acrylic shower surround ($300-$600 installed) instead of a tiled shower, and keep all plumbing fixtures on their existing locations. These two decisions alone can save $3,000-$5,000.

Choosing Materials

Material selection determines both the appearance and longevity of your bathroom. The cheapest option up front often costs more in replacements and repairs within five years.

Tile: Porcelain vs. Ceramic

Porcelain tile is fired at higher temperatures than ceramic, making it harder, less porous, and more resistant to cracking under heavy loads. For bathroom floors, porcelain is the better choice because it absorbs less than 0.5% water, compared to 3-7% for standard ceramic. Check the PEI (Porcelain Enamel Institute) rating: PEI 3 or higher for floors, PEI 2 or higher for walls. Large-format tiles such as 12x24 inches cost roughly the same per square foot as 6x6 inch tiles but cover more area per piece, reducing installation labor by 20-30% and creating fewer grout lines that need cleaning. For shower floors, use 2x2 inch mosaic tiles on a mesh sheet for proper slope and drainage.

Grout: Cement vs. Epoxy

Standard cement-based grout costs $12-$18 per bag and requires sealing every 6-12 months to prevent staining and water penetration. Epoxy grout costs $40-$60 per bag but never needs sealing, resists stains from shampoo, soap, and hard water, and bonds more aggressively to tile edges. The downside of epoxy is a shorter working time during installation (you have about 30-40 minutes before it begins to set) and a stickier consistency that makes cleanup harder. For shower walls and floors, epoxy grout is worth the upgrade. For backsplashes and dry areas, cement grout with a quality sealer performs adequately.

Vanity: RTA vs. Custom

Ready-to-assemble (RTA) vanities from retailers like IKEA or Home Depot range from $200-$500 and arrive flat-packed for home assembly. They include the cabinet, doors, and hardware but not the countertop or sink. Custom vanities built by a cabinetmaker cost $1,500-$3,000 and allow you to specify exact dimensions, wood species, finish, and internal storage configurations. Standard vanity height is 36 inches from floor to countertop. If your home was built before 1990, the existing vanity may sit at 30 inches, which feels low by modern standards. A taller vanity reduces back strain and matches standard kitchen counter height, making the bathroom feel more proportional.

Shower Surround: Acrylic Panels vs. Tile

Direct-to-stud acrylic shower panels cost $300-$600 for a standard 5-foot tub surround and install in a single day. The panels snap together with interlocking seams and require no grout, eliminating the most common water intrusion point in tiled showers. Tile showers cost $1,500-$3,000 for materials and labor and take 3-5 days to complete. Tile offers unlimited design flexibility with color, pattern, and layout options that acrylic cannot match. Acrylic panels can develop hairline cracks at seam joints over time and cannot be repaired invisibly. For rental properties and budget remodels, acrylic makes sense. For your primary bathroom, tile delivers better long-term value and visual impact.

Step-by-Step Renovation Sequence

This is the exact sequence I follow on every bathroom remodel. Deviating from this order creates rework, delays, and damaged materials.

Step 1: Demolition (Days 1-2)

Turn off the water supply at the main shutoff or the bathroom isolation valves. Remove the toilet by disconnecting the supply line, unbolting the closet bolts at the floor, and rocking the bowl side to side to break the wax ring seal. Remove the vanity by disconnecting supply lines and the drain trap, then unscrewing the cabinet from the wall. Tear out tile down to the studs using a pry bar and hammer; wear safety glasses and an N95 respirator because tile dust contains crystalline silica, which causes permanent lung damage with repeated exposure. Remove flooring down to the subfloor. Rent a dumpster ($200-$400 for a 10-yard container) to handle the debris. A full bathroom demo for a 5x8 room takes one person 6-8 hours.

Step 2: Rough-In Plumbing and Electrical (Days 3-5)

This step requires licensed professionals in most jurisdictions. The plumber moves supply lines to new fixture locations, installs drain-waste-vent piping, and sets the shower valve and tub drain at the correct height and depth. The electrician runs wiring for the exhaust fan, recessed lighting, GFCI-protected outlets, and any new circuits required by code. A dedicated 20-amp circuit is required if you plan to install a heated floor or a high-wattage exhaust fan with built-in heating elements. After rough-in is complete, the inspector must sign off before you close the walls with cement board. Schedule the inspection promptly; delays here cascade through the entire timeline.

Step 3: Cement Board Installation (Days 5-6)

Install 1/2-inch cement board (HardieBacker or Durock) on shower walls and 1/4-inch cement board on the bathroom floor. Cut cement board with a scoring knife or a circular saw fitted with a cement board blade. Fasten boards with cement board screws spaced every 8 inches, keeping screws at least 1/2 inch from edges. Tape all joints with alkali-resistant mesh tape and cover with a thin layer of modified thinset mortar. Cement board costs $12-$16 per 3x5-foot sheet. Do not use standard drywall or greenboard in the shower enclosure; neither product holds up to direct water exposure over time.

Step 4: Waterproofing (Days 6-7)

Apply a liquid waterproofing membrane such as RedGard or Laticrete HYDRO BAN over the cement board in the shower area. These products cost $50-$80 per gallon and cover 50-60 square feet per gallon. Paint on two coats using a roller or brush, allowing each coat to dry completely before applying the next. The dried membrane turns a uniform red or orange color, making it easy to spot missed areas. Waterproof the entire shower floor and extend the membrane at least 6 inches above the showerhead rough-in height on the walls. Also seal the cement board joints and any penetrations where pipes pass through the wall. This step prevents water from reaching the wall studs and subfloor, which causes rot and mold behind the tile.

Step 5: Tile Floor Installation (Days 8-10)

Start by verifying the subfloor is level. Use a self-leveling compound ($25-$35 per bag) if the floor has dips or valleys greater than 1/8 inch over 10 feet. Lay out your tile pattern dry before committing to thinset, starting from the center of the room and working outward. This ensures cut tiles land against the walls rather than in the middle of the floor. Spread thinset with a notched trowel (1/4-inch square notch for most floor tiles), set tiles with spacers, and check periodically with a level. Allow the thinset to cure for 24 hours before walking on the floor. Grout the next day using a rubber float, working in small sections and wiping excess grout from tile surfaces with a damp sponge. Seal the grout after 72 hours using a penetrating grout sealer.

Step 6: Tile Wall Installation (Days 10-14)

Begin wall tile from the second row up, using a straight ledger board screwed to the wall as a temporary support. This keeps tiles level and prevents them from sliding down the wall while the thinset sets. Cut tiles around shower valves, pipe penetrations, and electrical boxes using a wet saw, which rents for $50 per day from Home Depot or Sunbelt. A wet saw produces clean cuts without chipping, which is critical for visible wall tile. Remove the ledger board after the thinset cures and install the bottom row of cut tiles. Grout wall tile the same way as floor tile. For shower walls, use epoxy grout if your budget allows.

Step 7: Install Vanity and Toilet (Days 15-16)

Set the vanity cabinet in position and check for level. Shim the base as needed, then secure the cabinet to the wall studs with cabinet screws through the back panel. Install the faucet on the sink or countertop before setting the sink into the vanity, which is far easier than reaching underneath after installation. Connect supply lines using compression fittings or push-fit connectors, and attach the drain assembly with plumber's putty at the sink flange. For the toilet, install a new wax ring ($5) on the closet flange, set the bowl straight down onto the flange bolts, and press firmly to compress the wax ring. Tighten the nuts hand-tight plus a quarter turn with a wrench; overtightening cracks the porcelain. Install the tank, connect the supply line, and test for leaks.

Step 8: Paint (Days 16-17)

Use a bathroom-specific paint formulated with mildewcide to resist mold growth in high-humidity conditions. Benjamin Moore Bath Spa ($55 per gallon) is a reliable choice. Apply eggshell or satin finish on walls for easy cleaning, and semi-gloss on trim and doors for durability. Prime any patched drywall areas with a PVA primer before applying the finish coat. Cut in edges with a brush, then roll the walls with a 3/8-inch nap roller. Two coats of finish paint provide adequate coverage over primed surfaces. Allow the paint to dry for at least 24 hours before reinstalling switch plates and towel bars.

Step 9: Install Fixtures (Days 17-18)

Mount the showerhead arm, tub spout, and trim plates. Install the exhaust fan cover and connect the ductwork if not already done. Mount vanity sconces on each side of the mirror at eye level (approximately 66 inches from the floor to the center of the fixture). Install the mirror using mirror adhesive or J-channel brackets. Mount towel bars, toilet paper holder, and robe hooks. For towel bars, locate wall studs with a stud finder and use 2.5-inch screws; hollow wall anchors will pull out under the weight of wet towels. Install the shower door or curtain rod last.

Step 10: Caulk and Trim (Day 18)

Apply 100% silicone caulk around the tub rim where it meets the wall tile, around the vanity top where it meets the wall, and at any transition between tile and drywall. Silicone remains flexible as the house settles and provides a waterproof seal that paintable latex caulk cannot match. Use a caulk smoothing tool or your finger dipped in soapy water to create a clean bead. For baseboards and painted transitions where flexibility is less critical, use paintable acrylic latex caulk. Allow silicone caulk to cure for 24-48 hours before exposing it to water. Run the exhaust fan during curing to speed the process.

What to DIY vs. Hire Out

Knowing which tasks to tackle yourself and which to hand to a professional makes the difference between a successful remodel and a costly disaster.

Tasks Suitable for DIY

Demolition requires no special skills beyond caution and protective equipment. Painting is straightforward and forgiving of minor mistakes. Vanity and toilet installation follow repeatable steps that most homeowners can manage with basic tools and a few YouTube tutorials. Tile installation is achievable for willing beginners; the key is practicing cuts on scrap tile before cutting your actual material. Caulking, trim work, and accessory installation are low-risk tasks that do not require permits or specialized knowledge. These DIY tasks collectively save $3,000-$5,000 in labor on a typical bathroom remodel.

Tasks That Require a Professional

Plumbing rough-in work involves soldering copper pipes, gluing PVC, and ensuring proper drain slope (1/4 inch per foot minimum). Improper drain slope causes chronic clogs and sewer gas infiltration. Electrical work requires knowledge of load calculations, wire sizing, GFCI protection, and code-compliant box placement. A miswired GFCI outlet in a wet bathroom is a genuine electrocution hazard. Moving load-bearing walls requires an engineer's assessment and structural support calculations. Waterproofing, while technically possible for a DIYer, often comes with a manufacturer warranty that is only valid when installed by a certified applicator. If you want the waterproofing warranty, hire the pro.

Common Mistakes That Cost Thousands

These mistakes appear in roughly 40% of the bathroom remodels I am hired to fix. Avoid them and you will save yourself significant money and frustration.

Skipping Waterproofing on Shower Walls

Cement board alone is not waterproof. It absorbs water and holds it against the wall studs, which rot over time. The damage is invisible until tiles start cracking or a musty smell develops behind the wall. By the time you notice, the studs may need replacement, which means tearing out the entire shower. A liquid membrane like RedGard costs $50-$80 per gallon and takes two hours to apply. There is no justification for skipping it.

Undersized Exhaust Fan

A builder-grade 50 CFM fan is barely adequate for a half-bath with no shower. In a full bathroom with a tub or shower, you need at least 80-110 CFM to remove moisture before it condenses on walls and ceilings. Humidity that lingers after showers promotes mold growth on grout, caulk, painted surfaces, and window frames. Check the CFM rating on your existing fan (printed on the label inside the housing) and upgrade if it is below 80 CFM for a full bathroom.

No Access Panel for Tub Plumbing

The drain assembly and overflow valve behind a tub require occasional maintenance or repair. Without an access panel, a plumber must cut a hole in the wall to reach these components, then patch and paint afterward. Install an access panel in the wall adjacent to the tub before closing it up. Prefabricated plastic access panels ($15-$30) snap into a rectangular cutout and take five minutes to install. If you prefer a cleaner look, use a removable picture frame or mirror mounted over the access opening.

Failing to Level the Floor Before Tiling

An uneven subfloor causes tiles to crack under foot traffic and creates visible lippage where adjacent tiles sit at different heights. Check your floor with a 6-foot level before starting tile work. Fill low spots with self-leveling compound and grind down high spots. The cost is $25-$50 in materials and one afternoon of labor. Ignoring this step voids most tile manufacturer warranties and produces a floor that looks amateur regardless of how expensive the tile is.

Using Sanded Grout on Polished Tile

Sanded grout contains fine silica sand that scratches polished, glazed, or glass tile surfaces during installation and cleaning. Use unsanded grout on any tile with a polished or glossy finish. The general rule is sanded grout for grout joints wider than 1/8 inch, unsanded grout for joints 1/8 inch or narrower. If your polished tile has 1/4 inch joints, use an epoxy grout instead of sanded cement grout to avoid scratching.

Not Ordering Extra Tile

Order 10-15% more tile than your square footage calculation indicates. This surplus covers cuts around fixtures, diagonal layouts that waste more material, and breakage during installation. Tile manufacturers dye lots vary between production runs. If you run short and order more later, the new batch may not match the original color. Leftover tile also serves as future replacements for cracked or damaged pieces. Most retailers accept returns on unopened boxes within 90 days, so the financial risk of over-ordering is minimal.