Area on the plan
WC1 master bath
Existing Bath/WC 1 footprint highlighted.
Use this drawing for spatial context only. Dimensions and site conditions must still be verified before design or construction.
Open the complete redacted plan
After the merge
What remains before design sign-off
The owner brief is aligned. These remaining items require interior-designer input, specialist confirmation, measurements or later selections; they do not reopen the completed brainstorm and merge.
Context and Design Intent
Completely overhaul the 20-year-old master bathroom as a calm, visually spacious, easy-maintenance and quietly luxurious space for Fahmi and Yasmin. Provide reliable water containment, genuine wet/dry separation, comfortable circulation, effective drying and accessible services while preparing sensibly for future HIP work.
This file is the authoritative requirements record for WC1. It preserves the valid detailed first-pass requirements and merges the two independently completed owner brainstorms without selecting between differing preferences.
Non-Negotiables
WC1-NN-001 — Agreed ventilation direction: Use the existing window or natural-ventilation opening together with a normal small toilet ceiling-mounted circulation fan. Do not provide a ducted mechanical exhaust or extraction system. Select a moisture-suitable fan and coordinate safe electrical provision, airflow and maintenance access; any window enlargement remains subject to HDB approval.
WC1-NN-002 — Drainage and water containment: Provide proper floor falls and drainage throughout. No ponding may occur, and water must not escape into the main bedroom under normal use or drainage-fault conditions.
WC1-NN-003 — Agreed kerb-free entrance with internal shower containment permitted: Provide a completely flush, kerb-free transition between the main bedroom and WC1. An internal shower kerb or dropped shower zone is acceptable. Detail any internal level transition for safe use and coordinate it with floor falls, waterproofing, drainage, shower separation and full water containment.
WC1-NN-004 — Full waterproofing: Completely renew the waterproofing system and test it properly before finishes are applied.
WC1-NN-005 — Pipe inspection and replacement: Inspect existing water, waste and concealed pipes and replace defective or unsuitable sections rather than covering or patching them.
WC1-NN-006 — Accessible pipe boxing: Box exposed pipework neatly while retaining removable access to maintainable joints, valves, traps and future HIP works without full demolition.
WC1-NN-007 — Mould remediation: Inspect and properly treat existing mould and moisture-damaged surfaces before applying new finishes.
WC1-NN-008 — AC condensate routing: Route condensate deliberately to an appropriate drain without crossing or wetting the floor, causing ponding, obstructing the floor trap or producing audible dripping. Coordinate gradient, termination and access between the ID, bathroom contractor, plumber and AC contractor, and test all relevant AC units before handover.
WC1-NN-009 — Spacious circulation: Provide comfortable movement and avoid an oversized vanity. When space trade-offs are unavoidable, Fahmi's attributed order is shower space, circulation, vanity/countertop and then additional storage.
WC1-NN-010 — Right-sized storage: Provide adequate storage for daily bathroom use without crowding the room.
WC1-NN-011 — Mould-resistant surfaces: Design the ceiling, flooring, grout lines, silicone and other joints to resist mould and remain inspectable and maintainable. Minimise grout lines and dirt traps.
WC1-NN-012 — Agreed integrated vanity direction: Use a joint-minimised integrated sink and countertop that resists stains, scratches, moisture and normal bathroom chemicals. Ceramic remains a performance reference, and the ID may demonstrate aesthetically suitable alternatives that meet the same criteria.
WC1-NN-013 — Agreed shower fittings: Provide both a rain shower and a handheld shower in the shower zone.
WC1-NN-018 — Agreed wet/dry zoning: Provide genuine separation so the dry vanity and entry zone remains usable while the shower is occupied.
WC1-NN-019 — Agreed toilet type: Provide a conventional floor-mounted toilet.
WC1-NN-020 — Fahmi: Provide bathroom-safe vanity power and charging for electric toothbrushes and shavers, with suitable load and placement for hair-dryer use.
WC1-NN-058 — Agreed: Install an electronic bidet seat or washlet during the renovation. Select a model that minimises difficult-to-clean recesses and detachable or inaccessible parts, and demonstrate practical cleaning, electronic reliability, repair access, warranty, servicing and spare-parts support.
Strongly Preferred
WC1-SP-021 — Agreed: Create a calm, uncluttered, easy-maintenance and quietly luxurious hotel-bathroom character with well-proportioned fittings and restrained detailing.
WC1-SP-022 — Agreed: Provide a mirrored cabinet across the practical vanity width together with under-counter cabinet or drawer storage, subject to circulation, ergonomics and the agreed space priorities.
WC1-SP-023 — Agreed: Provide a separate very-dim night mode using low-level vanity or mirror lighting so night use does not require bright overhead light. Fahmi additionally wants layered general and softer ambient modes.
WC1-SP-024 — Fahmi: Select shower-screen glass, coatings and details for low visible water and soap build-up, practical cleaning, replaceable seals and long-term maintainability.
WC1-SP-025 — Fahmi: Provide deliberate locations for bath towels, hand towels, toilet roll, toiletries, cleaning supplies and a weighing scale without obstructing circulation. Yasmin's specific towel-bar position is recorded separately.
WC1-SP-026 — Fahmi: Keep the bathroom dry and fresh without relying primarily on leaving the main-bedroom door open; use quiet equipment because WC1 directly adjoins the bedroom.
Decisions Outstanding
WC1-DO-014 — Confirm the HIP schedule for Block 893A with HDB.
WC1-DO-015 — Confirm whether window enlargement is necessary, feasible and approvable after assessing the existing opening and the agreed ceiling-circulation-fan arrangement.
WC1-DO-016 — Select the water-heater type across WC1, WC2 and the kitchen through SYS-DO-006. Yasmin provisionally prefers gas instantaneous if it proves optimal for the three-person household; do not decide this within WC1 alone.
WC1-DO-017 — Confirm the AC-condensate receiving-drain location through coordination between the ID, plumber and AC contractor. Fahmi prefers WC1, but the final location remains a cross-area technical decision.
WC1-DO-038 — Agreed design process: Ask the ID to demonstrate full enclosure, fixed-panel, sliding and other suitable shower-screen arrangements for splash containment, circulation, cleaning and maintenance. Fahmi and Yasmin are jointly open to the alternatives and will select the final arrangement after the demonstration.
WC1-DO-040 — Agreed selection process: Select the integrated vanity product after the ID demonstrates ceramic and suitable alternatives against the jointly accepted performance criteria and both owners review appearance and physical samples.
WC1-DO-042 — Finalise the entry door, vanity configuration, palette, tile products, drain type, mirror arrangement, lighting controls and accessory positions after measured and technical demonstrations.
Differences Requiring Joint Discussion
None unresolved.
Resolved joint decisions
WC1-DIFF-001 / WC1-DO-038 — Resolved 22 August 2026: Fahmi and Yasmin jointly agreed to remain open to the shower-enclosure alternatives demonstrated by the ID. The final product remains a later design selection, not an owner disagreement.
WC1-DIFF-002 / former WC1-DO-039 — Resolved 22 August 2026: jointly agreed to install an electronic bidet seat or washlet during the renovation, subject to the cleaning, reliability, repairability, warranty and service criteria recorded under WC1-NN-058.
WC1-DIFF-003 / WC1-DO-040 — Resolved 22 August 2026: jointly confirmed there is no disagreement. Both owners accept the joint-minimised construction and performance criteria in WC1-NN-012 and want the ID to compare suitable materials before final product selection.
WC1-DIFF-004 / former WC1-DO-041 — Resolved 22 August 2026: jointly agreed not to provide a ducted mechanical extractor. Use a normal small toilet ceiling-mounted circulation fan together with the window or natural-ventilation opening, as recorded under WC1-NN-001 and WC1-SF-034.
WC1-NN-003 clarification — Resolved jointly on 25 September 2026: Fahmi and Yasmin confirmed that the kerb-free requirement applies to the WC1 entrance. An internal shower kerb or dropped shower zone is acceptable when safely detailed with complete waterproofing, drainage and water containment. This supersedes the earlier overbroad prohibition on all internal kerbs; WC2's separate no-internal-kerb requirement is unchanged.
Detailed requirements and coordination
Provisional Ideas
WC1-P-027 — Yasmin: Use light, neutral, cohesive matt wall and floor finishes with a feature wall in the shower zone.
WC1-P-028 — Yasmin: Provide a tiled corner shelf as the primary shower-toiletry holder and add a recessed niche if construction and layout permit.
WC1-P-029 — Fahmi: Consider concealed structural backing for possible future grab bars and identify locations with the owners before waterproofing and finishes are completed; visible grab bars are not currently requested.
WC1-P-030 — Fahmi: Identify an accessible position for a future owner-installed water-leak sensor without installing one during the renovation unless later selected.
Subject to Feasibility
WC1-SF-031 — Demonstrate the proposed internal shower kerb or dropped shower zone against WC1-NN-003, including its height or depth, edge profile, slip and trip safety, waterproofing continuity, drainage, cleaning and water containment, while preserving a completely flush WC1 entrance.
WC1-SF-032 — Demonstrate entry-door and shower-screen arrangements against the measured room so doors do not conflict, the walkway is not constricted and one person can use the dry zone while the other showers.
WC1-SF-033 — Test whether Yasmin's 850 mm vanity height, wall-to-wall mirrored storage, floating under-counter cabinet, limited open shelf and under-vanity lighting are ergonomic, moisture-safe, cleanable and proportionate to the available space.
WC1-SF-034 — Assess the existing window or ventilation opening and demonstrate the moisture-rated ceiling circulation fan's safe size, position, clearances, electrical provision, airflow, cleaning access and contribution to bathroom drying without a ducted extractor.
WC1-SF-035 — Compare vanity materials and integrated construction methods using stain, scratch, chemical, moisture, repair, warranty and maintenance criteria rather than appearance or material name alone.
WC1-SF-036 — Compare large-format, minimal-grout or groutless finish systems and suitable grout or sealant alternatives against slip resistance, cleanability, mould resistance, replacement access and cost.
WC1-SF-037 — Confirm the shower shelf or niche does not materially reduce useful shower space or create a persistent dirt or water trap.
Attributed Owner Positions
These positions remain attributed and are not jointly agreed requirements unless recorded otherwise later.
Fahmi
WC1-FP-043 — Use a thermostatic mixer to select the rain or handheld shower for one-at-a-time operation.
WC1-FP-044 — Provide a bidet spray beside the toilet with accessible isolation or control.
WC1-FP-045 — Prefer a sliding or pocket entry solution over an outward-opening hinged door if it provides the clearest walkway; require the ID to demonstrate the options.
WC1-FP-046 — Integrate suitable lighting controls with Home Assistant through a supported route such as Zigbee or Tuya while retaining ordinary physical switches and manual operation. The former extractor-control preference is superseded by the joint decision not to install a ducted extractor.
WC1-FP-047 — Prefer WC1 as the AC-condensate receiver and use a seamless, quiet, unobtrusive route with full inspection and cleaning access.
WC1-FP-048 — Prefer groutless or minimal-grout finishes and consider acrylic grout or a demonstrably comparable system where grout remains necessary.
WC1-FP-049 — An ordinary easy-clean mirror is sufficient; heating or demisting is not required. Vanity face lighting and shower-zone mood lighting may be separately priced options.
WC1-FP-056 — Supply hot water to both the shower and basin from the selected central whole-home water-heating system.
WC1-FP-057 — Visual privacy within the shower enclosure is not a constraint for Fahmi.
Yasmin
WC1-YP-050 — Use an 850 mm vanity height, a floating under-counter cabinet, minimal open shelving, under-vanity accent lighting and a mirrored cabinet spanning the full practical vanity width.
WC1-YP-051 — Use a bottom-of-mirror light as the subtle night light and an LED strip below the floating vanity.
WC1-YP-052 — Use light, neutral, cohesive matt finishes and locate a feature wall in the shower zone.
WC1-YP-053 — An exposed toilet cistern is acceptable.
WC1-YP-054 — Do not provide a heated towel rail or hooks behind the door; place a towel bar near the shower exit.
WC1-YP-055 — Prefer gas instantaneous water heating if the whole-home comparison shows it is the optimal option for the household.
Questions for the Interior Designer
Show measured entry-door, vanity and shower-enclosure options that preserve a completely flush WC1 entrance, circulation, dry-zone use and full water containment.
Demonstrate the proposed internal shower kerb or dropped shower floor, including dimensions, safe edge treatment, floor falls, waterproofing continuity, drainage, cleaning and splash containment.
Compare fully enclosed, fixed-panel and sliding shower screens for splash control, usable space, cleaning, glass treatment and replacement access.
Show the complete vanity section, including 850 mm height assessment, integrated material options, mirrored and under-counter storage, lighting, outlets, trap and service access.
Demonstrate the window or natural-ventilation opening and normal ceiling circulation fan together, including fan size, moisture suitability, safe clearances, airflow, cleaning access and electrical controls.
Show the AC-condensate route, gradient, drain termination, acoustic treatment and all maintenance points, and specify the handover test.
Compare floor, wall, grout, sealant and shower-glass systems using wet slip resistance, mould resistance, cleaning effort, product compatibility, warranty and replacement requirements.
Coordinate the floor-mounted toilet, required bidet spray and agreed installed bidet seat or washlet with safe power and water services and practical cleaning and repair access.
Present the layered general, ambient and night-lighting design with physical control fallback and any proposed smart integration.
Whole-Home Coordination
Apply SYS-SP-001 and SYS-SP-005 to bathroom electrical capacity, safe power, pipework, AC condensate, water heating and accessible service routes.
Resolve the shared water-heating system through SYS-DO-006 across WC1, WC2 and the kitchen. Yasmin's gas-instantaneous preference remains attributed and provisional.
Route Home Assistant lighting protocols, smart-switch infrastructure and physical-control fallback to the later Whole-Home Systems merge; Fahmi's lighting-control requirements remain attributed here until jointly accepted.
Coordinate the final AC-condensate receiving drain and route with the whole-home AC design and WC2.
Apply the agreed warm contemporary minimalist direction under SYS-SP-007 and coordinate the WC1 palette with SYS-SP-008, while recognising that bathroom performance and physical samples govern final wet-area materials.
Scope Clarification
Robot-vacuum access into WC1 is not required.
WC2 wet/dry zoning remains a separate assessment.
Contractor approval administration is outside this requirements document.