Sydney Based + National Delivery
Sydney Based + National Delivery
There is no single flat price for DPC injection. Cost is driven by wall structure, access conditions and job complexity, not just linear metres.
Chemical DPC injection in Australia typically costs between $150 and $350 per linear metre.
That range reflects real variation in wall conditions and site access rather than product markup. A straightforward single brick wall with open access sits at the lower end. Double brick, thick heritage masonry or restricted access pushes toward the upper end.
Two quotes for the same job can look very different. The main reason is experience and thoroughness, not just product choice.
A thorough contractor will inject every hole to saturation, confirm uptake before moving on and adjust their method when a wall behaves unexpectedly. A less experienced operator may rush the injection, underdose or miss sections that aren’t immediately obvious. The barrier looks the same from the outside either way. The difference only shows up later.
A higher price often reflects a more thorough job. DPC injection is one of those trades where cutting corners is invisible until the damp comes back.
Cream systems suit smaller, lower-risk jobs on uniform modern brickwork. They’re the practical choice for DIY applications and simple remedial work where wall conditions are predictable and the risk of a discontinuous barrier is low.
Fluid injection systems are selected when wall thickness, age or variability requires confirmed distribution across the full wall width. For professional rising damp treatment in Australian masonry, particularly pre-1960s construction, fluid injection is the standard method. The pressure injection process provides real-time visual confirmation of product movement during the job, which matters when a warranty is attached to the outcome.
The cost difference between methods reflects wall complexity and application approach, not simply product price.
Brick Density
One of the biggest variables in job time is how long the injection fluid takes to permeate the brick itself. Dense clay brick, common in older Sydney construction, absorbs fluid significantly slower than soft sandstock brick. On a dense brick wall the injection sequence can take two to three times longer than an equivalent run of softer masonry, which directly affects labour cost per linear metre.
Wall thickness
Single brick walls require less product and fewer injection points than double brick or rubble-filled construction. Thicker walls take more fluid, more time, and carry higher risk of incomplete barrier formation if underdosed.
Access difficulty
Open walls with clear mortar joints are straightforward. Walls behind built-in cupboards, vanities, or kitchen cabinetry add significant time and cost. Skirting boards, tiles, and floor coverings that need to be removed and reinstated are also factored into the total job cost.
Wall condition
Broken or deteriorated masonry, heavily salt-affected walls, or walls with internal voids require additional assessment and method adjustment. These conditions increase injection time and product volume to achieve a continuous barrier.
Site complexity
Corners, wall returns, internal partitions, and changes in wall height all add to the injection length and complexity of achieving a complete barrier. Jobs that look simple on paper often have these compounding factors once drilling starts.
Injection method
Fluid injection systems and cream systems have different application rates and product volumes. Method selection should match wall conditions, not just what’s cheapest on the day.
The most expensive outcome in rising damp treatment isn’t a thorough job. It’s a job that needs to be redone.
Selecting a system matched to the wall conditions from the outset is where the real cost saving sits.