Help to prevent condensation and mould in your Durham home, diagnosed in-person by a local expert.
Our domestic ventilation specialists will assess your property, identify ventilation needs and recommend the most effective solution for your home. This service is free, with no obligation.
envirovent is proud to hold Which? Trusted Traders approval for our national installation service. All our installations are conducted by professionally trained ventilation engineers who understand airflow requirements and system performance.
Recognised across the industry for innovation and quality, our ventilation systems are engineered for performance, efficiency and long-term reliability.
Our tailored solutions help minimise moisture build-up, improving indoor conditions and protecting your property from the damage caused by condensation.
Streaming windows on a cold morning, damp patches on the walls, mould appearing in the corners and around the window frames. It is one of the most common problems in Durham homes, and it comes back every winter until the underlying cause is dealt with.
Much of the housing in and around the centre of Durham is older terraced property, built close together and built to hold heat in rather than let moisture out. As these homes have been improved over the years with double glazing, draught-proofing and insulation, the moisture from everyday life has fewer ways to escape. It settles on the coldest surfaces, and that is where the mould starts.
Condensation can look straightforward but its cause is often less obvious. What works in one home can make things worse in another, which is why the right diagnosis matters before anything else.
The real causes are usually hidden: where moisture is being produced, how air moves through your property, where cold spots form, and how the building was constructed. Reading an Durham property correctly takes experience, and that experience is what you get with every survey.
Every free survey is carried out in person by a local specialist. It's never outsourced and never guessed at remotely. The whole team is trained directly alongside envirovent's flagship head office technical team, so the expertise that diagnoses your home is the same high standard on every visit.
During your survey, the specialist takes humidity readings, identifies the underlying cause, and recommends the specific solution your property needs, with no obligation. It's a considered diagnosis of your actual home, not a one-size-fits-all answer.
Anthony Hunter envirovent Local Specialist
Our local specialists are trained to assess condensation, damp and mould issues in a range of property types, from older homes through to modern builds. They will help recommend the most effective ventilation system for your home and arrange installation with our approved engineers.
We provide ongoing support, servicing and friendly advice whenever you need it, from initial survey to post-installation queries. If you're unsure where to start or simply want expert guidance, contact our specialist team and we are here to help.
We provide a full range of UK-manufactured ventilation systems that help reduce condensation and improve indoor air quality in every type of property:
Positive Input Ventilation (PIV): Whole-home systems that introduce filtered air and help prevent mould and damp.
Extractor Fans: Silent, efficient and fully compliant with Building Regulations.
Mechanical Ventilation with Heat Recovery (MVHR): Energy-saving solutions for new builds and refurbishments.
Free in-person home survey: A proper diagnosis of what's causing condensation or mould in your specific property, carried out by a trained local specialist.
Installation and Servicing: Delivered by a specialist who knows your property and area.
See how our expert team and solutions help customers tackle mould and improve indoor air quality
If you have an issue with condensation, mould build up or ventilation issues then envirovent are the company to go to. I have been using their services for 10 years and have had a number of my rental properties surveyed by envirovent where they come up with a solution to eradicate mould issues by creating extra ventilation methods or better ventilation.
Landlord in Croydon
We have suffered condensation mould and running water on our windows for over 40 years. We have tried numerous products to remedy this and never really succeeded. In a matter of days of having this system fitted our problems have been solved. Really pleased. Great service, a brilliant system couldn’t ask for anymore.
Homeowner
We are a returning customer to envirovent. We know their systems work to reduce/remove problems with condensation & mould. We would highly recommend their products & all aspects of their service from initial enquiry, through to installation.
Homeowner
Durham has a large stock of older terraced housing in and around the centre used as student and shared accommodation, and these properties see condensation problems more than most. High occupancy puts far more moisture into a property than it was ever built to handle, and with tenants changing every year, problems tend to be reported late and repeat every winter.
Condensation and mould in rental property is also increasingly a legal consideration, not just a maintenance one. Awaab's Law came into force for social housing in England in October 2025, introducing strict timeframes for addressing damp and mould, and the government has stated its intention to extend similar duties to the private rented sector.
We work with private landlords and letting agents across Durham, whether you have one property or a portfolio of several hundred. The starting point is always the same: a free survey to establish what is actually causing the problem. If you have a number of similar properties, it often makes sense to start with the two or three giving you the most trouble, since what we find there usually tells us a great deal about the rest of the stock.
Once you request a free survey*, one of our local ventilation specialists will get in touch to speak to you and discuss your concerns. If ventilation can provide a long term solution, we’ll arrange a convenient time to visit your home.
During the free survey* one of our local ventilation specialists will:
Assess any condensation or mould problems in your property
Take readings of the relative humidity levels
Identify any underlying problems and make recommendations for a long term solution
Free, no-obligation advice for property and homeowners to help improve your home’s ventilation and indoor air quality.
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*Please see additional limitations and fees for the below postcodes and areas
Subject to geographical locations in KW & ZE
In BT postcodes a £60 fee is applied, which is deductible from the final bill.
In postcode areas BA1-BA16, BS, CB, CM, CO, E, EC, GL, HR, IG, IP, LE, LU, MK, N, NG31-NG34, NN, NR, PE, RM, SE, SG, SS, SW and WR, we are unable to provide an in-person survey. Please contact us at domestic@envirovent.com or call 01423 810 810 to discuss the options available.
Frequently Asked Questions
You often can't tell just by looking. The same black mould can be caused by surface condensation, a ventilation problem, a building defect, or a combination, and each needs a different response. That's exactly what the free home survey is for: an in-person assessment and humidity readings to pinpoint the real cause before any money is spent.
A trained local specialist, in person, every time. The whole team is trained directly alongside envirovent's head office technical team, so you get the same standard of expert diagnosis on every visit. It's never done remotely
It depends entirely on what your property needs, which is why an expert survey comes first. The survey itself is free and carries no obligation. You'll get a clear recommendation and a price for the right solution.
No. The survey is completely free and there's no obligation to go ahead. It's the best first step whether or not you choose to go further.
Awaab's Law already sets strict damp and mould duties for social housing in England, Scotland's version is confirmed to cover private rentals from October 2026, and the UK government has signalled it intends to bring similar duties to private rentals in England. The direction is clear, so getting ahead of it now is the sensible move. Your local specialist works with private landlords to assess properties and resolve damp and mould at the source.
They're especially prone to it. With all the living space on a single level, moisture from cooking, washing, drying clothes and breathing builds up quickly, and without the right airflow it settles on cold surfaces as condensation. Over time that leads to damp and black mould. They're among the most common property types we're called to, and getting the airflow right throughout the home is what helps to prevent it.
Explore our range of PIV, extractor fans, MVHR, MEV and dMEV's. Or get expert advice and guidance for the right product for your home or property.
The Atmos® range are loft mounted Positive Input Ventilation (PIV) systems that are designed to reduce mould and condensation and improve indoor air quality within a property.
The Cyclone 8 is a continuous running extractor fan suitable for WCs, bathrooms, utility rooms and kitchens. It is a major advancement in extractor fan technology; it utilises a centrifugal impeller and our Intellitrac technology which ensures extremely high airflow performance and humidity levels are controlled all year round.
The Atmos® Wall range are wall mounted Positive Input Ventilation (PIV) systems that are designed to reduce mould and condensation and improve indoor air quality within flats or apartments.
Understanding what’s causing them in your home is essential to protecting both your property and your health. If you’re dealing with condensation, damp or mould, you’re not alone — thousands of households across the UK experience the same issues every year.
Problems like condensation and mould can affect any property, old or new. What matters is understanding the cause and knowing the steps that can help reduce it.
Condensation is excess moisture in the air settling on cold surfaces, often leading to damp and mould—discover how to prevent it.
Unwanted moisture inside a property caused by leaks, rising water, or poor ventilation.
A fungal growth that thrives in damp, poorly ventilated areas and can affect health and air quality.
Our Knowledge Hub is your go-to resource for expert guidance on ventilation and solving condensation, mould, and indoor air quality issues.
UK homes are built to hold heat in — not let moisture out. Learn how ventilation can protect your home from condensation, mould and mould
Protect your rental property and reduce costly damage caused by mould and condensation
Support your tenants and landlords with effective, compliant home ventilation solutions
