Misty windows, musty air and black mould around the windows or behind furniture? Condensation is the North East's most common damp problem — and it's very fixable.
Free survey Up to 30-yr guarantee Local NE specialists
★★★★★96.1% customer satisfaction · 1,250+ jobs since 2005 · up to 30-year guarantee
20+
Years protecting NE homes
1,250+
Damp jobs quoted since 2005
96.1%
Customer satisfaction
30yr
Guarantee on qualifying work
Condensation & Mould explained
What is condensation & mould?
Condensation happens when warm, moist indoor air meets a cold surface and turns to water, feeding the black mould you see on windows, ceilings and behind furniture. It's the most common form of damp in North East homes and is driven by humidity, poor ventilation and cold spots. The solution combines safe mould removal with improved ventilation — such as extractor upgrades or a Positive Input Ventilation (PIV) unit — to keep humidity under control.
Know the signs
Signs of condensation & mould to look for
Spotting it early keeps the repair small. These are the tell-tale signs in North East homes:
Black spotty mould on walls, ceilings, sealant and window reveals
Streaming or misted-up windows, especially in the mornings
A persistent musty, damp smell in the home
Mould on clothes, behind wardrobes and in corners
Worse in winter, in bedrooms, bathrooms and kitchens
Common causes
Why condensation & mould happens
Everyday moisture from cooking, washing, drying clothes and bathing
Poor or absent ventilation and extractor fans
Cold spots and thermal bridging on external walls
Blocked vents and sealed-up draughts trapping humid air
Lifestyle plus modern airtight homes holding moisture in
Our proven process
How we treat condensation & mould
Diagnosis first, then a lasting, guaranteed fix — never a sticking plaster.
Survey & humidity check
We measure humidity, find the cold spots and confirm it's condensation rather than another damp source.
Safe mould removal
We treat and remove existing black mould with anti-microbial products that tackle the spores, not just the surface stain.
Improve ventilation
From upgraded extractor fans to a whole-home PIV unit, we install the right ventilation to keep humidity below the level mould needs.
Advice & prevention
You get simple, practical guidance to keep the home healthy — and the improvements do the heavy lifting so you don't have to.
Get rid of condensation & mould for good
Book your free, no-obligation survey. We'll confirm the cause, give you a clear fixed price and back the work with up to a 30-year guarantee.
A 96.1% satisfaction rating isn't an accident — it's what happens when local specialists do the job properly, the first time.
★★★★★
“Dean was professional from start to finish and finished ahead of schedule — all backed by a 30-year guarantee. Couldn't recommend them more.”
ST
Sarah T.Newcastle upon Tyne · Verified customer
★★★★★
“Had tide marks creeping up the hallway for years. The survey explained exactly what was wrong and the price was fair. Bone dry now.”
MR
Mark R.Gateshead · Verified customer
★★★★★
“Black mould in the bedroom was making us ill. Honest advice, no scare tactics, sorted in two days. Brilliant local team.”
JP
Joanne P.Sunderland · Verified customer
Your questions, answered
Condensation & Mould FAQs
Is black mould dangerous to my health?
Black mould can aggravate asthma, allergies and breathing problems, particularly for children, older people and anyone with a respiratory condition, so it's worth dealing with promptly. We remove it safely and, crucially, fix the underlying humidity so it doesn't simply grow back. If you're worried about symptoms, speak to your GP as well.
Will wiping the mould off solve it?
Only temporarily. Wiping treats the symptom; unless you reduce humidity and improve ventilation, the mould returns within weeks. Our approach removes the mould and controls the moisture so it stays gone.
What is a PIV unit?
Positive Input Ventilation gently introduces filtered fresh air from a discreet loft-mounted unit, displacing the stale, humid air that feeds condensation. It's quiet, cheap to run and one of the most effective whole-home fixes for condensation in North East properties.
How quickly can you treat condensation?
Mould treatment and ventilation upgrades are usually completed in a single visit, and you'll notice the difference in humidity almost immediately.
This is a lead generation website. By submitting your details you are simply being passed to a reputable, independent tradesman.
Any work carried out is paid directly to them, not to North East Damp Proofing.
