Rising Damp Newcastle connects Newcastle homeowners with independent damp specialists. A salt bloom on the wall. Paint lifting above the skirting. A tide mark about a metre up. We arrange a full assessment that works out what is really happening, before anyone quotes to fix it.
Call 0495 106 195Tell us what the wall is doing.
We connect Newcastle property owners with independent damp specialists holding the appropriate NSW Fair Trading licence.
Why Newcastle homes get rising damp: Any house can get it. What changes is why.
Newcastle gets a little over 1,100mm of rain a year. Much of it falls in short heavy bursts. East coast lows and summer storms drop more in a few hours than the drains were built to carry. Water arriving that fast does not soak in evenly. It runs off, and it ponds against whatever is in its way. It then sits in the soil around and under the footings for weeks, long after the street looks dry.
Rising damp only affects ground-floor walls, because the water comes up out of the soil. If you can see any of these low on a wall, get a full assessment from a damp specialist. They take moisture readings inside and out. They check the ground levels around the house. They then put the cause in writing. Do that before the plaster and the skirting are damaged, and before anyone quotes a repair.
An even horizontal line, roughly 600mm to 1.2m above the floor, on a ground-floor wall. It marks where the water stops climbing and starts evaporating. Condensation does not produce a level line like this.
Salts left behind as the water evaporates. Brushing it off works until the next wet spell.
Almost always a non-breathable coating over a wall that needs to dry outward. The coating is not failing — it is working, in the wrong place.
Salt crystallisation forcing the surface apart. Worst on the coastal strip and usually well advanced before anyone calls it damp.
Not damp. That pattern points at ground movement. Across much of Newcastle that means mine subsidence. That may be compensable, and it needs a different call entirely.
Flash flooding out of the creek catchments charges the ground for weeks. Flood-legacy damp is saltier and more destructive than the everyday kind, and it surfaces months later.
Older houses often have no working damp course. Newcastle's inner suburbs are full of Victorian and Federation brick — terraces through Cooks Hill and the city, workers' cottages across Wickham, Islington and Tighes Hill. Much of that pre-war brick either never had a damp course, or has one that failed a long time ago.
Newer houses almost always have one, and still get rising damp. The usual cause is that the ground outside has ended up higher than the damp course. A concrete path, a raised garden bed, a slab poured against the wall, a re-levelled yard. Any of those lets water walk straight around the barrier. That happens on a 1990s brick veneer as easily as on a 1900s cottage, and it is usually cheaper to fix.
A shared wall adds a complication either way. If you are in a terrace or a semi, the damp does not stop at the boundary. The wall dries from one face instead of two. And the fix is a conversation with a neighbour before it is a quote.
Salt does the damage. Groundwater carries dissolved salt up into the wall. As the water evaporates the salt stays behind. Near the coast, from Merewether round to Stockton, more salt arrives on the wind. Those crystals grow and push. That is what crumbles mortar and takes the face off a brick. The water moves the salt; the salt breaks the wall.
The order matters. Say the real problem is a cracked footing. Injecting a damp course into that wall is money spent on the wrong thing. That is why the assessment comes first and the quote comes after.
Readings up the wall, then outside: levels, the rear lane, paving, downpipes, and whatever render or paint is already stopping the wall breathing.
Rising damp, lateral damp through a cut-in wall, a leak, condensation, or what a creek flood left behind. On a Newcastle wall all five leave a mark near the floor and only one needs a damp course.
Ground above the damp course is the fix, not a second damp course below it. Injecting under a bridge changes nothing and you will have paid for it.
Roughly a month per ten millimetres of wall thickness. Double brick means most of a year before it is ready to paint, and painting early undoes the work.
The full sequence is set out on our how it works page.
Rising damp is groundwater climbing a wall. Everything else — the salt, the lifting paint, the smell — follows from that one fact.
Everything we get asked, in one place. If your question is not here, ring and ask it.
An inspection works out which problem you actually have. Most of them are cheaper to fix than the one everyone assumes.
There is no licence called damp proofing. The one that matters is waterproofing, and it is worth two minutes to check.
A chemical course is a barrier injected into the mortar line. It is right when there is no working damp course, and wrong when there is one that has been buried.
Does the crack through your brickwork step down the mortar joints? That points at ground movement, not moisture. It also changes who you should be ringing.
A shared wall is shared in both directions. It is the single biggest practical difference between damp work in Newcastle and damp work in a detached-housing city.
Newcastle floods two different ways, and they leave different problems behind. Neither is what most people picture when they hear the word flood.
A large share of what gets sold as rising damp treatment in this city is a drainage job wearing a damp course's clothes.
If the wet patch sits at the height of the ground outside rather than near the floor, the water is not rising. It is being pushed through.
Water moves the salt. The salt breaks the wall. Treat one without the other and the wall comes back.
Most trades will not publish a price. Here are the ranges, and what moves you within them.
These are the ranges we see quoted around Newcastle. They are wide on purpose. One wall can cost several times what another does. The thickness, the access and how much salt is already in it all change the price.
| Work | Indicative range | What it covers |
|---|---|---|
| On-site assessment and written diagnosis | $450 plus GST | Readings taken at intervals up each affected wall, an external check of levels, lanes and downpipes, and a written finding. Where there is cracking it also says whether you should be calling Subsidence Advisory NSW instead. |
| Chemical damp-proof course, per metre | $170 - $330 | Injected into the mortar course. A shared terrace wall sits at the upper end because of access and because it can only be worked from one side. |
| Salt-retarding replaster, per square metre | $120 - $260 | Contaminated render off, breathable system on. Near the water this is rarely optional — the southerly loads the wall with salt from outside while the damp loads it from within. |
| Drainage and ground-level correction | $900 - $6,000 | Dropping a path, cutting a bed back, taking a downpipe away from the wall. On the terraces this often means the rear lane, where decades of resurfacing have raised the ground against the back wall. |
| Subfloor ventilation improvement | $1,200 - $4,500 | For the timber-floored cottages, where a closed subfloor holds moisture under the house. |
Prices are indicative ranges only. Every fixed price quote follows an on-site assessment.
Rising damp is groundwater soaking up into a wall from the soil underneath it. Brick, stone and mortar are full of tiny holes. Water climbs those holes the same way it climbs up a paper towel. It stops about a metre up, where it dries off the wall as fast as it arrives. That is why the mark is a level line and not a patch.
Rising damp only happens on ground-floor walls, and it makes an even horizontal line about 600mm to 1.2m up. A leak makes a patch, usually higher, and usually worst after rain. Condensation shows up on cold surfaces and in corners, and it is worst in winter. A moisture meter and a look outside settle it in about an hour. Guessing is what costs people money.
A damp course is a waterproof layer built into a wall, just above the ground. It stops water climbing any higher. Older Newcastle houses were built with slate, lead or bitumen. Newer ones use plastic. A damp course can fail with age, or be bridged, which means water found a way around it.
Yes. The most common cause in a newer house is that the ground outside has ended up higher than the damp course. A concrete path, a garden bed, a slab or a re-levelled yard will do it. The water walks around the barrier. This is usually the cheapest kind to fix, because the fix is outside the house.
Damp walls grow mould. NSW Health says mould and damp indoors are linked to coughing, wheezing and asthma symptoms. It affects children, older people and people with asthma the most. Cleaning mould off the surface does not fix it while the wall is still wet.
No. A dehumidifier dries the air in the room. Rising damp keeps feeding water into the wall from the ground. The machine can make the room more comfortable while you sort the real cause out. It will not stop the water coming up.
Painting over damp is the most common mistake we see. Normal paint traps the water in the wall instead of letting it dry outwards. The paint then lifts off in sheets, often worse than before, and the salt comes with it. Fix the water first, let the wall dry, then paint.
An assessment with a written finding is $450 plus GST. Injecting a new damp course runs about $170 to $330 a metre. Replastering a salty wall is about $120 to $260 a square metre. Sometimes the answer is only drainage or ground levels, which can cost less than any of that. Every fixed price quote follows an on-site assessment.
The physical work is usually a few days. The drying is the long part. A wall dries at roughly one month for every ten millimetres of thickness. A double brick wall can take most of a year before it is ready to paint. Finishing early undoes the work.
Usually not. Australian home policies commonly exclude gradual damage, wear and tear and lack of maintenance, and rising damp falls into that group. A sudden event is treated differently — a burst pipe, for example, is often covered. Read your own policy wording, and ask your insurer before you assume either way.
You can buy an injection kit. Home attempts usually fail for one of two reasons. Either the diagnosis was wrong and the wall never had rising damp. Or the salt already in the wall was left there, so the mark comes back through the new plaster. The chemical is the cheap part of the job.
Yes. NSW Fair Trading licenses residential building work. We only refer specialists who hold the licence their work needs. You can ask for the licence number and check it yourself on the Fair Trading register. A legitimate operator will not mind.
Yes. A building inspector will normally find it, and a buyer will ask for a price reduction or walk away. A written assessment is useful either way. If you are selling, it shows what the real problem is and what it costs. If you are buying, it stops you guessing at a number.
In practice, both of yours. Water does not stop at the boundary line. A shared wall also dries from one face instead of two, so it takes longer. The assessment covers the wall. The conversation with your neighbour usually has to happen before work starts.
No. A crack that steps down through the brickwork points at ground movement. Across much of Newcastle that can mean mine subsidence, and subsidence damage may be compensable through Subsidence Advisory NSW. Rising damp does not crack a wall in that pattern. A crack does let water in, so the two often turn up together.
Yes, and it lasts longer than people expect. Flash flooding out of the Throsby, Styx and Cottage Creek catchments soaks the ground around footings for weeks. Floodwater also carries salt into the wall. That makes it more damaging than everyday damp, and it often shows up months later.
We arrange assessments across Newcastle and the lower Hunter, including:
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Rising Damp Newcastle