Map Drainage, Waterproofing and Clearance Impacts

Choose the tub-to-shower job

Before requesting a quote, distinguish an alteration to a retained tub, a replacement shower in the same footprint, and a shower with relocated fixtures. These are different scopes: altering the existing tub is not the same as rebuilding its wet-area assembly. Describe bathing, access and cleaning goals, then confirm which job the contractor will price and what must be inspected first. For a retained-tub alteration, ask the installer to name the product, confirm compatibility with the tub's material and condition, and explain whether the tub remains usable for baths afterward.

Prepare a measured plan

Mark room dimensions, door swing, window, fixtures, walls, floor elevations and vertical constraints; treat final clearances as design inputs. Add joist direction or slab information when known, plus the space below, because those facts can control whether a proposed drain location is practical.

Separate keep from move

A replacement in place and a relocated fixture carry different demolition, rough-in, floor and approval questions. The City identifies adding, moving or removing plumbing fixtures as a permit-relevant scope for condo and townhouse renovations, so proposals should label fixture changes precisely.

Map drainage and supply

Ask how drain location, slope, venting, supply piping, shutoffs and below-floor access affect the proposal. Record whether exploratory work is included, how structural conflicts are escalated and what restoration outside the bathroom may be needed to reach the services. For an occupied home, agree which water-dependent activities and bathroom facilities will remain available while this work is underway. If this is the household's only bathing space, ask what alternative arrangements you need to make before the shutdown and who will tell you when the fixtures can be used again. Separately agree which washroom the crew may use, any off-limits areas, and the contact for changes to access or the work schedule.

Draw the wet-area assembly

Connect substrate, receptor, curb or entry, membrane, corners, penetrations, doors or screens and adjacent finishes in one detail set. Show how the shower threshold meets the bathroom floor and how the selected drain belongs to the named waterproofing system.

Coordinate electrical and design review

Record outlets, lighting, fans, heating, controls, support or blocking and professional checks before final layout. Surrey administers electrical permits, and regulated electrical work should be assigned to the appropriate permit holder before walls or ceilings conceal the installation.

Test the proposed movement path

Sketch entry, door swing, turning, transfer, seating, fixture approach and caregiver space using actual user tasks. Treat dimensions and support locations as design inputs requiring project-specific review, not as a universal accessible layout.

• Include wet-foot travel
• Check towel and storage reach
• Record future support needs

Trace rough-in consequences

For every moved fixture, map drain route and slope, venting, water supplies, shutoffs, joist or slab constraints and access from spaces below. Separate confirmed records from assumptions that require investigation.

• Protect structural members
• Plan shutdown coordination
• Price investigative openings

Draw the complete shower assembly

Show receptor or base, slope, curb or entry, drain connection, substrate, membrane, corners, penetrations, doors or screens and outside-floor transition. Require compatible product documents and evidence before concealment.

• Coordinate blocking and controls
• Define water-test responsibility
• Record threshold and drainage detail

Create the layout-change coordination drawing

Overlay existing and proposed fixtures, door and movement paths, drain and vent routes, water supplies, joist or slab constraints, electrical and fan locations, support or blocking and the complete wet-area assembly. Mark investigative openings and decisions required before ordering. Link dimensions to actual user tasks and qualified design review, then assign each trade interface and finish repair. Preserve the final drawing with concealed-work evidence. It coordinates the tub-to-shower or room change without promising universal accessibility, structural feasibility, drainage performance or permit acceptance. Before demolition, mark key dimensions and penetrations on site against the accepted drawing. Any conflict involving structure, plumbing, wet-area continuity or user clearance should return to the responsible design review before work proceeds.

• Use measured existing conditions
• Show below-floor access
• Map every membrane transition
• Coordinate controls and blocking
• Record final as-built changes