The average bathroom addition cost is $4,500 to $7,500. The final cost depends on the size, type, and number of amenities, as well as the level of difficulty and labor rates in the area. Remodeling Magazine pegs the average remodeling costs for a six-foot by eight-foot bathroom addition in the Midwest, East Coast, and Western states. A 100-square-foot master bath is an example of a more expensive option, and costs $78,816 nationwide.
The average cost of adding a bathroom is approximately $51,000. However, the cost of a bathroom addition varies depending on several factors, including the amount of square footage and the level of finishes. While a low-end bathroom can cost as little as $50 per square foot, a high-end luxury bathroom can cost up to $650. Also, the more square footage the bathroom will have, the higher the overall cost. In addition, many homeowners choose to install windows in their bathrooms, which can increase their bathrooms’ appeal and increase their value.
Plumbing and electrical costs can vary depending on several factors, including the size and type of addition. Adding a bathroom to an existing room can save money if the space is already in place. A crawlspace can reduce plumbing and electrical costs. Alternatively, you can install a new foundation for an extra bathroom. This will cost you approximately $4 to $7 per square foot. When adding a bathroom to the attic, you may have to install a dormer, which costs $115 per square foot.
Veken Shower Caddy 6-Pack, Advanced Rustproof Design, No Drilling Adhesive Shelves, Rack with Soap Holder, Large Capacity Bathroom Organizers and Storage, Wall-Mounted Kitchen & Home Decor
$17.99 (as of January 30, 2026 00:32 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Bathroom Faucets for Sink 3 Hole, Hurran 4 inch Matte Black with Pop-up Drain and 2 Supply Hoses, Stainless Steel Lead-Free 2-Handle Centerset Faucet for Sink Vanity
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Korky 6094BP StrongARM Tank Lever, Universal to Fit Front Angled Side Left and Right Mount Toilets, Brushed Gold, Simple Style
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TEECK Shower Curtain Rod, 32-80 inch Adjustable Spring Tension Curtain Rod, Never Rust Anti-Slip Shower Curtain Rod for Bathroom, No Drilling, Never Collapse, Easy to Use, Silver
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MR.SIGA Toilet Plunger and Bowl Brush Combo for Bathroom Cleaning, Black, 1 Set
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Titanker Shower Curtain Hooks Rings, Rust Resistant Metal Double Glide Shower Hooks Rings for Bathroom Shower Rods Curtains, Set of 12 Hooks - Nickel
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LUXE Bidet NEO 120 - Single Nozzle, Self-Cleaning, Non-Electric Bidet Attachment for Toilet Seat, Adjustable Water Pressure, Rear Wash (White)
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BigFoot Clear Shower Curtain Liner - 72x72 Odorless Plastic with Magnets, Washable Long Bathroom Curtain - Premium PEVA Waterproof Bath Shower Liner, Rust-Proof Bathroom Essentials
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OLANLY Bathroom Rugs 30x20, Extra Soft Absorbent Chenille Bath Rugs, Rubber Backing Quick Dry, Machine Washable Bath Mats for Bathroom Floor, Tub and Shower, Home Decor Accessories, Grey
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