DIY Concrete Bathroom Vanity with Integrated Sink

Create a sleek, modern bathroom vanity using poured concrete for both the countertop and an integrated sink basin. This project combines affordability with high-end aesthetics, achievable in a weekend using basic tools and materials costing under $100.

Why Choose Concrete for Your Vanity?

Concrete vanities offer unmatched durability, heat resistance, and a contemporary industrial vibe that elevates any bathroom. Unlike laminate or wood, concrete withstands daily wear, moisture, and impacts while allowing full customization of size, shape, and color. Integral sinks—where the basin is molded directly into the top—eliminate seams, preventing leaks and simplifying cleaning.

Lightweight mixes with fibers or overlays make it accessible for solo DIYers, avoiding the need for heavy molds or professional equipment. Results mimic high-end stone like travertine or marble, but at a fraction of the cost.

Gathering Materials and Tools

Stock up on these essentials before starting:

• Concrete mix: Use feather finish, glass-fiber-reinforced, or white portland cement for lightweight results (10-20 lbs per vanity).
• Mold materials: Melamine boards, foam blocks, or silicone for sink forms; polyester cloth optional for smooth finishes.
• Sealers and finishes: Food-grade epoxy, polyurethane, or slurry cement for waterproofing.
• Tools: Putty knives, drywall trays, orbital sander, mixing drill, silicone caulk, plastic sheeting.
• Reinforcements: Fiberglass mesh, fibers, or wood panels to reduce weight and cracking.

Budget tip: Source mixes from hardware stores; total cost stays low by skipping pre-made molds.

Planning Your Vanity Dimensions

Measure your space precisely. Standard single vanities are 24-36 inches wide, 20-22 inches deep, with 1-2 inch overhangs. Account for faucet holes (1.5-inch diameter) and drain placement. Sketch the sink basin: aim for 12-16 inches wide, 6-8 inches deep, with gentle slopes to the drain.

Adjust for overhangs and backsplash (4-6 inches high). Test-fit on your cabinet base.

Building the Sink Mold

The sink basin defines the project’s success. Skip complex plywood by using foam or pre-shaped inserts.

1. Carve foam (6-inch thick insulation boards) with a hot wire cutter, jigsaw, or angle grinder for curved profiles. Use MDF templates for symmetry.
2. Glue layers securely; sand smooth. Wrap with form tape or plastic for clean release.
3. For knockouts: Embed plastic pipes for faucets and foam plugs for drains, ensuring countersunk washers for trim.
4. Seal edges with silicone; position centrally on the countertop form.

Pro tip: Vibrate molds post-pour to eliminate air bubbles, using an orbital sander base.

Assembling the Countertop Form

Use melamine-coated boards for non-stick surfaces. Cut to size with 0.5-1 inch overhangs.

• Screw sides securely; silicone all seams.
• Attach sink mold with silicone beads at corners and edges for leveling.
• Add dividers for backsplash; drill or glue faucet knockouts.

For lightweight builds, incorporate wood panels or mesh reinforcements before pouring.

Mixing and Pouring the Concrete

Achieve pancake-batter consistency for overlays or thicker slurry for full pours.

Overlay Method (Easiest for Beginners)

No forms needed—perfect for existing tops.

1. Prep surface: Remove fixtures, clean thoroughly.
2. Mix feather finish concrete with water; let rest 5 minutes, remix.
3. Apply thin first coat (1/8 inch) with drywall knives; work into corners by hand.
4. Fill basin similarly; smooth ridges with damp sponge after 10-20 minutes semi-dry.
5. Sand lightly; add 2-3 more coats for opacity.

Full Pour Method (For Custom Thickness)

Fill forms bottom-up.

1. Mix fiber-reinforced concrete; spray thin face coat with texture gun for finish.
2. Pack into sink first, vibrate; add countertop layer (1.5-2 inches thick).
3. Screed level; cover with plastic for 3-7 day cure.

Vibrate frequently to densify; avoid gaps under upper forms.

Curing and Demolding

Patience prevents cracks. Cure 4-7 days under plastic sheeting to retain moisture. Demold by unscrewing forms; peel liners gently.

Inspect for bug holes (air pockets). Fill with slurry (cement-water paste); sand progressively: 120-grit coarse, up to 400-grit fine.

Refining the Surface

Achieve stone-like polish:

• Wet sand or diamond polish for gloss.
• Fill imperfections iteratively with slurry coats.
• For texture: Buff lightly post-seal.

Integral sinks shine here—smooth basin walls with sponges during semi-dry phase.

Sealing for Longevity

Essential for water resistance. Apply 2-3 thin coats of sealer:

• Epoxy resin: Deep shine, food-safe.
• Polyurethane: Matte or satin options.
• Concrete-specific sealers: Penetrate pores.

Reapply yearly; test with water beads.

Installation on Your Cabinet

Lift onto base (use helpers for full pours). Secure with construction adhesive and screws into anchors.

• Cut drain hole precisely; install fixtures.
• Caulk edges; add backsplash if separate.

Level carefully; silicone overflows for hidden drains.

Customization Ideas

Elevate your design:

• Colors: Add pigments during mixing for earth tones or whites.
• Embeddings: Glass, fibers, or LEDs for illuminated sinks.
• Shapes: Undermount knockouts or freeform basins.
• Textures: Aggregate mixes or hammered finishes.

Common Mistakes and Fixes

Safety and Best Practices

Wear gloves, masks, goggles—concrete is alkaline. Work in ventilated areas. Dispose of waste properly. For heavy lifts, use ramps or helpers.

Cost Breakdown

FAQs

Can beginners make a concrete vanity?

Yes, overlay methods take 2-3 hours active time; full pours need 1 week cure but use simple forms.

How heavy is a concrete vanity top?

Lightweight mixes yield 20-50 lbs for standard sizes, manageable solo.

Is it waterproof?

Proper sealing makes it fully resistant; reapply as needed.

What if I want color?

Mix in pigments; test small batches for consistency.

Can I do this over laminate?

Absolutely—roughen surface first for adhesion.