Planning a bathroom renovation, new ensuite, wet area shower or laundry-to-bathroom conversion? ArchSolutioNZ prepares council-ready drawings and specifications so waterproofing, drainage, ventilation and floor details are documented before construction starts.
Bottom line
Start here when moisture, drainage or floor details matter. A bathroom renovation can affect internal moisture, waterproofing, sanitary plumbing, drainage, ventilation, floor structure and sometimes fire or acoustic separation.
Best fit
It suits residential bathroom and wet area projects where the key issue is how the work will be built, waterproofed, drained, ventilated and coordinated before construction starts.
For homeowners adding a new bathroom, ensuite, toilet, shower or moving a bathroom to a different part of the house.
For tiled showers, level-entry showers and wet areas where falls, floor wastes, membrane extent and junctions need proper documentation.
For bathroom renovations involving drainage changes, floor structure, shower set-downs, ventilation routes or service penetrations.
Project types
Council needs enough information to understand proposed construction, materials, drainage, ventilation and compliance before bathroom work starts.
Consent drawings for a new bathroom, new ensuite, added toilet, added shower or bathroom addition inside an existing home.
Plans for moving a bathroom to a different part of the house, including new fixture positions, ventilation path and service coordination.
Documentation for wet area shower, tiled shower and level-entry shower layouts, including falls, wastes, waterproofing zones and junctions.
Drawings for converting a laundry or service room into a bathroom where plumbing, drainage, ventilation and waterproofing need coordination.
Consent documentation where floor framing, floor levels, shower set-downs, wastes or structural support need to be assessed.
Plans and notes showing bathroom ventilation, penetrations, fan discharge routes and how moisture is managed in the renovated space.
Consent package
The exact drawing set depends on the house and scope, but it should clearly explain the work so council, the builder, plumber and waterproofing installer are working from the same information.
Consent triggers
Cosmetic work is different from building work that affects plumbing, drainage, structure, waterproofing or ventilation. Consent drawings must show how the bathroom or wet area will be built.
| Bathroom work | Why it matters | What drawings should clarify |
|---|---|---|
| Adding a toilet or shower | New fixtures can affect sanitary plumbing, drainage and ventilation. | Fixture layout, drainage coordination, ventilation and wet area notes. |
| Bathroom relocation | The new room may need new wastes, pipe routes, floor openings and moisture protection. | Existing and proposed plans, service routes, floor and wall details, ventilation path and plumbing coordination. |
| Wet area or level-entry shower | Falls, floor wastes, waterproofing and junctions need careful documentation. | Shower set-out, membrane extent, floor falls, waste location and threshold details. |
| Floor structure change | Cutting, trimming or lowering floors can affect structure and durability. | Floor build-up, structural coordination and relevant construction sections. |
| Ventilation change | Bathrooms generate internal moisture that must be managed. | Fan location, discharge route, penetrations and internal moisture notes. |
Waterproofing
The drawings should make it clear where waterproofing applies, how shower and floor wastes work, how wall and floor junctions are treated, and how the chosen system can be installed correctly.
We identify wet area extent, shower area, wall and floor junctions, membrane locations and key set-out dimensions.
Wet area shower and level-entry shower drawings need to show how water will drain to the floor waste without creating moisture risk.
Bathroom surfaces and ventilation need to support internal moisture control, durability and cleaning requirements.
Process
The process turns the bathroom scope into drawings and notes that support council assessment and construction coordination.
We review whether you are adding, relocating or altering fixtures, floors, walls, ventilation or waterproofed areas.
The drawing set captures the current layout, proposed bathroom layout, construction scope and affected walls, floors or penetrations.
We document waterproofing, floor wastes, ventilation and floor structure details, and coordinate with required consultants or trades where needed.
You receive a building consent drawing and specification package designed to support council assessment and construction coordination.
Cost context
Real pricing depends on plumbing changes, drainage runs, waterproofing system, shower type, floor structure, ventilation route, product selection and whether specialist input is needed.
| Question | Practical answer |
|---|---|
| How much does a bathroom renovation cost in NZ? | Cost depends on finishes, fixtures, waterproofing, plumbing changes, drainage, floor structure, ventilation and whether consent drawings or specialist input are needed. |
| Why can wet area showers cost more? | Tiled wet area or level-entry showers usually need more detailed waterproofing, floor set-out, falls, waste positions and junction details. |
| What hidden items affect bathroom pricing? | Pipe routes, joists, floor levels, existing moisture damage, ventilation routes and product systems can all affect cost before finishes are selected. |
| Why prepare drawings before pricing? | Clear consent drawings help builders, plumbers, waterproofers and council assess the same scope instead of relying on assumptions. |
Clarity
This page is for normal residential bathroom building consent documentation before work starts.
Not the right pathway? Kitchen or laundry-only plumbing work belongs under Kitchen, Laundry & Plumbing Alterations. Completed unconsented bathroom work belongs under Certificate of Acceptance.
Official context
These references are useful when checking how Building Code internal moisture, waterproofing and consent requirements apply to bathrooms and wet areas in New Zealand.
Questions
Sometimes. A surface-level bathroom refresh may be different from work that adds a shower, toilet, wet area shower, new drainage, floor penetrations, ventilation upgrades or waterproofing changes. Where building consent is required, we prepare the drawings and specifications council needs before work starts.
Council approval may be required when the bathroom work affects sanitary plumbing, drainage, structure, waterproofing, ventilation or other Building Code matters. The key is to define the scope clearly before construction begins, then prepare consent drawings if the work needs a building consent.
Bathroom waterproofing requirements depend on shower type, floor construction, selected membrane system and wet area layout. Consent drawings should identify waterproofing extent, floor wastes, falls, wall and floor junctions, thresholds and relevant system notes.
Many bathroom floors need moisture protection, especially where there is a tiled shower, level-entry shower, wet area shower or floor waste. The required details depend on the floor build-up, product system and wet area design.
Yes, but adding a bathroom usually involves new sanitary plumbing, drainage, ventilation and moisture protection. It may also affect floor structure or fire separation depending on location. We prepare the building consent drawings before work starts.
Timing depends on design decisions, trade availability, product lead times, whether consent is required, and how quickly consultant information is coordinated. Consent drawings should be prepared early so pricing, council review and construction planning are based on the same scope.
Send your bathroom idea, sketches, photos or existing plans. We can help turn the scope into council-ready drawings for a new bathroom, ensuite, shower, toilet, wet area or laundry-to-bathroom conversion.
