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Preserve Your Property, Increase Its Value & Ensure It Remains Safe & Enjoyable For Years To Come

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Condensation Control Specialists

The way we are living in our homes is changing. Condensation is particularly common in homes that are affected by this change. Poorly heated and poorly insulated homes can cause condensation to arise, affecting the quality of airflow through our homes. Condensation is a real problem that requires a specialist surveyor to explore the cause of the problem and provide advice or propose solutions. We will ensure that your home is safe and that your property keeps up with modern living times.

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What is Condensation?


The most common form of unwanted dampness in buildings is water from the air that forms as condensation.

Condensation is often associated with poor heating and ventilation in buildings. It is more apparent in winter, as the external air temperature is low and external walls and windows are cold. The usual sequence of events is as follows:

  • Cold air enters the building
  • The air is warmed for the comfort of the occupants
  • The warm air takes up moisture
  • The warm, moist air comes into contact with cold surfaces, walls, windows, etc. and is cooled below its Dew Point
  • Condensation occurs as the excess moisture is released

Walls in kitchens and bathrooms (where atmospheric moisture levels are usually highest), solid external walls, uninsulated solid floors and cold bridges such as concrete lintels set in cavity walls are commonly the areas in which condensation takes place.

Intermittent heating and cooling of the property can aggravate condensation problems, since it allows warm damp air to cool, reducing its capacity to hold water. Dew points are reduced allowing condensation to occur. When the air is reheated water is taken back into the air only to be deposited again when the air temperature drops again.

Problems caused by Condensation


Running water on windows or walls is perhaps the most immediate indication of a condensation problem. If ignored this can lead to a deterioration in the decorative condition of your property, stained curtains and decay in window frames. The appearance of moulds on the surface of wallpapers and paints in poorly ventilated areas. Condensation can occur under suspended floors greatly increasing the chances of fungal decay in floor timbers.

A much less common form of condensation occurs when the Dew Point is reached, not on the surface of a wall but within the structure of the building itself. This is known as interstitial condensation and can easily be mistaken for rising damp or penetrating damp.

Condensation Control – Overcoming Condensation

Condensation is a real problem and where it persists, a specialist surveyor should be engaged to explore the cause of the problem and provide advice or propose condensation control solutions. We have listed just a few of the possible methods of condensation control below.

Simply heating the air is unlikely to be a satisfactory solution, not only on grounds of cost but also on practicality. Unless cold surfaces are eliminated and there is sufficient background ventilation, condensation is almost inevitable. Any remedial action, therefore, must involve lowering moisture levels, ensuring sufficient ventilation and the elimination of cold surfaces.

Improved heating and ventilation coupled with a specific action in relation to cold spots will usually result in a significant improvement in conditions, although there may be circumstances in which alternative methods are required. A modest but constant background heat is preferable to intermittent heating since this will help to maintain a higher ambient temperature in the fabric of the building.

The installation of suitable extractor fans in the moisture-producing rooms of a property such as a kitchen, bathroom and en-suites, will help remove the majority of this moisture-laden air from these areas (that are most responsible for condensation), with minimal running costs. This is a requirement within the Building Regulations for new properties being built, whilst also applying to existing buildings.

House Window With Damp And Condensation - condensation control

Black mould and fungus on wall near window. The problem of ventilation, dampness, cold in the apartment - condensation control

There are many types of extractor fans available such as those that run continuously in the background or those which incorporate a humidistat that will control the operation of the fan within certain humidity limits. It is also possible to install fans that have an integrated heat exchanger and these have the advantage of providing effective ventilation while reducing heat loss from the property. It is very important that these types of fans are professionally specified and commissioned by a suitably trained and qualified specialist.

Where an open fire or fixed gas fire exists, a certain amount of “natural” ventilation will occur and where additional ventilation is provided it is important that this is not blocked off.

The use of specialist insulation materials fixed to the outside of the building and insulation in cavity walls will help to improve the thermal dynamics of the building and may help overcome condensation.

An alternative to heating and ventilation for the control of moisture in the air is a dehumidifier. This is a device that draws in air, cools it to remove moisture which is collected in a reservoir and reheats it to an acceptable temperature before re-circulating it—these can be costly to run, however, and may not be considered a long-term solution.

Another condensation control device that may be considered is a positive pressure condensation control unit, also known as Positive Input Ventilation (PIV) units. These take drier air from roof spaces or lofts and mix this with air in the dwelling. This is done at a very low rate (below half an air change per hour) and has the effect of lowering total moisture content and removing moist air by natural leakage.

How it Works

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Builder inspection consultancy. Inspector checking material and structure in construction.
Have Your Survey Carried Out
One of our trusted and qualified remedial Surveyors will carry out a detailed survey of the property
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Get the treatment done
We'll take care of business and ensure you and your family can live a happy life knowing your property is safe
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Condensation Control FAQs

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Based on 8 reviews.
Clare Simpson
Clare Simpson
We were very happy with John who did most of the work. He was excellent at communication, tidy with the messy work, and very good at re-plastering. He was very obliging and clearly wanted to do an excellent job.
Steve Woodward
Steve Woodward
The workers were great. They made no fuss, were always polite, arrived when they said they would, meticulously covered any surfaces that needed to be, and cleaned up afterwards with a sense that it was their home they were finishing up on, rather than ours. They took pride in their work and set themselves high standards throughout.
Julia Carbonaro
Julia Carbonaro
I contacted Property Conservation Services to apply some damp proofing and replaster two walls of my house. They have been quick and accommodating in booking both the survey visit and the works. In three days everything was finished and so far we’re really happy with the result.
Helen Smith
Helen Smith
We used Property Conservation to convert our large basement into a damp-proof and fully useable guest suite including a fully waterproofed wet room. From the start they were so professional and knowledgeable. Considering the quality of workmanship and the value it has added to our property we feel it’s been amazing value for money & would highly recommend anyone who are thinking of converting an unused damp space to take the plunge with confidence!
Dorothy Beaumont
Dorothy Beaumont
Fabulous team from start to completion - Highly recomend !
John Connolly
John Connolly
Property Services Services agreed a contract with the previous owner of our house. Although it took over 6 months to purchase the property (don't ask!), the company honoured the contract at the original price. The work was carried out professionally and efficiently on the day finally agreed. I am very grateful and can heartily recommend the company. John Connoly
David Cross
David Cross
I use Property Conservation to carry out surveys and work on Housing Association properties and can highly recommend them. Their service is first class & their prices are the best, for example they installed a damp proof course on all 3 external walls of an end terraced house for less than the cost of what another company wanted to charge to damp proof course just one of the walls! Another company quoted me £350 plus VAT just to go and look at a property, the surveys carried out by Property Conservation are free. If you want the best service at the best price look no further.
Vernon Smith
Vernon Smith
Thorough and highly professional team. The process went smoothly from start to finish despite the opportunity for trauma.
Why choose Property Conservation Services
Over 150 YearsOf Combined Property Conservation Experience
Property Conservation Services has over 150 years of experience within the Team. There isn’t much we have not seen, worked on & treated over the years using both traditional & pioneering methods. Whether it's dealing with Woodworm, damp proofing properties or helping homebuyer's with pre-purchase inspections Property Conservation Services has an abundance of experience.
You can be assured our experienced Surveyors will take the time to understand & address your concerns—giving you all the information you need to make an informed decision. From assessing the roof timbers at the very top of your property to the basement waterproofing at the very bottom, our detailed surveys leave no stone unturned. With over 1000+ happy customers, both domestic & site (commercial), we must be doing something right!
Our Promise
We pride ourselves on honesty and trust, and we promise to provide exceptional quality in all aspects of what we do from the surveys that are conducted, to the work that is carried out no matter how big or small the job is. As well as providing great value for money, all of our work is guaranteed.
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