Completing single residential building applications

We have put together this simple guide to help you submit your single residential building application.

What to do prior to submitting your application

  • Obtain plans from Dial Before You Dig.
  • Determine the location of the sewer main nearest to your proposed building.
  • Determine the material type and depth of the sewer main nearest to your proposed building.
  • Read the Residential guidelines for designers document.
  • Self assess your design in conjunction with our requirements.

How to submit your application

Use our online self-service system BuilderNet to lodge your building application.

If you are not a regular BuilderNet user, you can utilise our Guest Account option to log in.

For a new house, you need to lodge a Single residence and service connection application.

For additions or extensions to an existing house, lodge an Addition/Alteration application.

You need to attach the following documents:

  • Architectural floor plan/s including measurements of the rooms.
  • A site plan showing the location of the proposed building on the property with measurements from the boundaries.

Note: BuilderNet will require these items to be attached electronically with either PDF or JPG file types. Each file must be less than 5MB in size.

For external additions such as pools, patios or sheds, please refer to our information about lodging a minor application.

Submit your application now

How to complete your application

Purpose of application

Please include an exact description of what is being constructed or improved. This is usually found on your building licence/council approved plans.

Estimated construction cost

The amount shown on your building licence. The amount should only include the cost of constructing the main building and critical elements of the building.

Estimated start and completion dates

These are the dates that construction of the building is expected to commence and be completed.

Builders Job Number

This is a reference used by the builder/building company for their jobs. If unknown, enter N/A.

Local authority

The local authority that the property is located in - i.e. the city/town/shire council where the building plans have been submitted to.

Demolition of existing building

The demolition date can affect the annual charges for the property. If the existing building on the property has been, or will be demolished, we will change the rating of the property from 'residential' to 'vacant land' effective from the first month after the demolition date. An accurate demolition date must be provided for our rating purposes.

Owner to occupy

 After the building is completed, will the owner be living in the premises? Please answer Yes or No.

Meter and service location details

Most services in new subdivisions are fully pre-laid (which means that the service has already been installed by the developer and has been left buried and inactive until such time as an application is submitted to us for the meter to be installed). 

If a water service has been pre-laid, or a water meter exists on the property, this service must be utilised and requests for it's relocation will be at the applicant's cost.

If the water service is not pre-laid, the meter position should be supplied in the 'Meter location details' section of the application form.

NOTE: The location of the service is always determined as if you are standing in the street looking at the lot.

A measurement from either the left or right hand side boundary should always be included in your application. If the measurement is unclear, the building plans will be returned to you for further clarification.

If the property is on a cross street, please include the name of the cross street on the diagram

To find out if the service is pre-laid, or has been already installed, please contact us on or call 13 13 95.


For a new house, you will need a builder's standpipe.

If there is an existing water service with a standpipe, this can be used to supply water during construction. If the service does not have a standpipe, you will be required to have a standpipe installed by your plumber. 

Number of toilets

For a new residential building, you will only need to advise on how many toilets are being installed.

For additions/alterations to an existing house, please advise how many toilets are:

  • already existing
  • being added
  • being removed.

More information

You can contact us via the following options:

Post: Water Corporation, Building Services, PO Box 100 Leederville WA 6902


Phone: 13 13 95

You may also be interested in

Lodge your application online

Login to BuilderNet
rolls of blueprints