Powder-room addition
Toilet and hand basin with a compact layout.
Plan this optionExplore a scope and request a reviewed quote. Coastal confirms service availability, qualified trade partners, site conditions and final pricing before a proposal.
ADDITIONS & CONVERSIONS
Bathroom additions
Build a bathroom as new floor area with the structure and utility routes planned together. Fixture placement, drainage connections, ventilation and waterproofing determine much of the scope before decorative selections begin.
START WITH THE DETAILS
What goes into
the work.
Measure the proposed footprint, ceiling height and connection to the existing home. Separate new conditioned area from converted existing area.
Typical scope to confirm
- Plan fixture locations and drainage routes
- Coordinate new foundation, shell and exterior connection
- Install specified plumbing, electrical and ventilation
- Define wet-area waterproofing, tile and fixture allowances
Make it specific to your project.
Enter the amount of work and choose the details you know. Your choices follow you into the Project Builder.
LOW / MIDDLE / HIGH REFERENCE
Low$400per sq ft
Middle$450per sq ft
High$500per sq ft
Low and high are published reference endpoints. Middle is their arithmetic midpoint, not a quoted average, product tier or firm price.
A planning reference for this service only. Selections, local labor, access, quantities and existing conditions need Coastal’s review. Do not add overlapping whole-project and component ranges.
HomeGuide · research checked 2026-10-22 · US national · installed
What changes the price
- Distance and elevation to existing drainage
- Bathroom size and fixture count
- Wet-area design and finish level
What the reference covers
- New bathroom construction
- Standard fixture and finish level
Allow for these separately
- Septic or utility-capacity upgrades unless listed
- Luxury fixtures and custom cabinetry beyond allowances
- Luxury finishes
- Major sewer/septic upgrades
KNOW WHAT COMES NEXT
From first idea to finished work.
Plan the scope
Plan the new bathroom footprint, drainage, venting and utility capacity.
Prepare and approve
Develop plans, assess foundations, obtain approvals and order key products.
Complete the work
Build foundations and structure, tie in the envelope, then complete trades and finishes.
Review and close out
Complete inspections, restore access and review the finished addition.
- Planning & preparation
- 6–16+ weeks
- Work on site
- 8–20+ weeks
Illustrative planning allowance for the stated scope, not a promised start or completion date. On-site time starts after approvals and materials are ready; procurement, inspection waits, curing and discoveries can extend the calendar.
Engineering and approval scope · Tie-ins and occupied-home phasing · Site conditions, weather and procurement
PERMIT PLANNING
A permit is required for the stated scope
New buildings and substantial additions require building permits in OKC, Edmond and Moore. Confirm site approvals and any separate electrical, plumbing and mechanical permits for the selected address.
- New dwelling or substantial new building
- New enclosed floor area or change of use
- New or altered utility systems
ENGINEERING & DESIGN
Engineering required for these conditions
Edmond requires an engineered footing design for the footprint additions covered by its alteration/addition checklist. Other locations and existing-space conversions need scope-specific structural review.
- An Edmond footprint addition under the city alteration/addition checklist
- New loads on existing framing or foundations
- Unusual soil conditions or nonstandard structural details
Confirm requirements with the city or county responsible for the property before work begins. The address, exact scope and adopted code determine the final requirements.
MAKE IT FIT YOUR HOME
Your starting options.
Compare the scope before choosing products. Any direction can be refined with Coastal.
MATERIALS & DETAILS
Find your finish.
These original swatches show a general visual direction. Confirm a physical sample, exact finish code and product compatibility before ordering.
Bathroom finish direction
Warm stone-look tile
Light warm wall and floor tile direction; select suitable wet-area products.
Use this direction
Slate-look porcelain
Dark stone-look floor direction; confirm texture and cleaning expectations.
Use this directionExterior color direction
PRODUCT RESEARCH
Brands & real-world examples.
Manufacturer references help compare options. They do not imply a Coastal dealership, endorsement, or a product selected for your project.
The design, material specification and local supplier are more meaningful than a single brand for this scope.
Explore example photos
Open the original source for product and installation imagery. These are reference links, not Coastal project photographs.
Source photograph shows a completed bathroom interior; it is inspiration rather than proof of an exterior addition. Example by the source, not a Coastal project.
Stock reference photograph; not a Coastal project or specified product.
YOUR PROJECT, VISUALIZED
Choose a direction.
See it in your space.
Start with common bathroom additions options, personalize the details, then upload a photo to create an AI concept.
Powder-room addition
Toilet and hand basin with a compact layout.
- Space use: Bathroom
- Custom product, finish code, or request: Powder-room addition. Finish direction: Warm stone-look tile. Toilet and hand basin with a compact layout.
Full bathroom
Plan a shower or tub along with toilet and vanity.
- Space use: Bathroom
- Custom product, finish code, or request: Full bathroom. Finish direction: Soft white tile. Plan a shower or tub along with toilet and vanity.
Access-focused bathroom
Coordinate entry, maneuvering room and bathing layout early.
- Space use: Bathroom
- Custom product, finish code, or request: Access-focused bathroom. Finish direction: Slate-look porcelain. Coordinate entry, maneuvering room and bathing layout early.
FROM INSPIRATION TO YOUR SPACE
Your home. This direction.
The example photo is inspiration. Your personalized concept applies your saved service and finish selections to the photo you upload.
- Choose a preset and adjust its selections.
- Add a photo of the room or area.
- Create a concept, compare it, and keep it with your project.
AI concepts are illustrations. Product matches, measurements and feasibility require Coastal’s review.
YOUR NEXT STEP
Bring it into your plan.
Keep rooms, measurements and choices together in the Project Builder.
Related scopes
Research sources & pricing notes
Reviewed 2026-10-23. Published ranges describe the source’s stated scope and geography; they are not an Oklahoma adjustment or a Coastal estimate. Do not add overlapping project ranges together.
- Bathroom addition cost — HomeGuide · US national
Stock photograph license · Finish swatches and scope diagrams are original illustrations.