How to Calculate Bathroom Remodel Cost?

How to Calculate Bathroom Remodel Cost?

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The remodeling cost of a bathroom may vary with the size of the bathroom, and the quality of the fixtures. However, it is important to understand the expenses associated with bathroom renovation.

In this article, we give you a breakup of the different types of bathroom renovations.


These are the mandatory expenses that you will incur irrespective of your bathroom remodelling costs:

  • Insurance premiums
  • Site maintenance, ongoing cleaning and rubbish removal
  • Project management and site supervision
  • Material procurement, delivery and loading
  • Building permit application and associated council/ VBA costs
  • Building surveyor if required
  • Access equipment
  • Material warranty and service guarantee
  • Required certificates of inspection and compliance
  • Electrical Make Safe

Construction Drawing Design

With a plethora of design options available to you, a bathroom renovation can get overwhelming. Thus, it is important to invest in proper construction design. Your designer will charge you for the following:

  • Floor plan
  • Interior view
  • Lighting Plan
  • Floor finishes plan
  • Wall finishes plan
  • Electrical appliances items list with power, sizes and schedule
  • Material samples
  • Construction details
  • Electrical service planning, drafting and documentation

Demolition and Removal

Removal of old design and hardware is a challenging and time-consuming task. Depending on your bathroom design, the interior designer will consider demolition and removal of:

  • Flooring
  • Wall Tiles
  • Shower Screen
  • Basin & Vanity
  • Shower Taps
  • Bath Taps
  • Lights
  • Exhaust Fans
  • Heaters
  • Wall Insulation
  • Ceiling Insulation
  • Wall and floor pipes
  • Window
  • Door gem and door

Floor/Wall/Ceiling Preparation & Installation

The main criteria for choosing floor and wall surfaces should be waterproofing and slip resistance. In addition, everything depends on the price and aesthetics. However, you will have to pay for the supply and installation of the basics like:

  • Plaster ceiling throughout
  • Waterproof plasterboard on walls
  • Waterproof cement sheet for tiled wall and floor areas
  • Wall and ceiling insulation

Tiling Work

Your designer will measure the bathroom floor area to calculate the cost of tiling and perform the following tasks:

  • Waterproofing toilet area where necessary as per drawing and spec
  • Lay floor tiles to agreed area
  • Lay wall tiles to an agreed height
  • Supply floor tile throughout toilet area as per drawing or spec
  • Supply wall tile to height as per drawing or spec


You don’t have many choices in plumbing. These are the basic tasks that your plumber will perform:

  • Replace any copper piping or other piping
  • Strip Drain
  • Move basin hot & cold taps
  • Move shower hot & cold taps


The colour pallet for painting is your choice however these things should be included:

  • Supply and paint all new plaster ceiling area as per drawing and spec
  • Supply and paint all new plaster wall area as per drawing and spec
  • Supply and paint all fixed timber including doors and skirting


The fittings cost typically includes supply and installation of:

  • Shower base and screen
  • Bathtub
  • Basin stand alone
  • Standard Door
  • Sliding Door
  • Towel Rail
  • Soap holders
  • Wall recessed ledge
  • Cabinets
  • Mirrors
  • Taps and accessories

However, your budget would greatly depend on the choice of fittings material and designs


The cost of connecting hidden cables from the distribution board to other electrical points on the wall or ceiling may vary with the wire thickness. Other than that, you will spend on the supply and installation of:

  • Ceiling lights
  • Wall lights
  • Electric heater
  • Power points
  • Light switches
  • Floor heating

You may also pay the expenses for timber and carpentry work and painting.


When it comes to bathroom remodeling, there are tons of hardware and equipment options-faucets, showers, sinks, tiles, paint-and there are so many things that require your attention. It is likely that you may put aesthetics over functionality and end up spending much above your budget. Therefore, we recommend consulting a trusted interior designer to give you the best options as per your budget.  If you want to manage and keep track of your project costs, timeframes, photos, emails and payments then head to

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