Professional PIV Unit Installation in London
Eliminates Condensation and Mould Growth
Improves Indoor Air Quality
Energy-Efficient and Low Maintenance
Customer Reviews
EXCELLENT Based on 5 reviews Deborah Brandon2025-07-03Trustindex verifies that the original source of the review is Google. Really happy with the service. The guys were friendly and sorted the mould quickly. Place looks and smells so much better now. Chris E Gibson2025-07-03Trustindex verifies that the original source of the review is Google. Hu there, wow what a service. The estimated quote was what I paid for the work don. The guys who came to complete the job were professional, on time and even cleaned up after. I would not hesitate to call them again or recoment them to anyone that had damp and mould like i did. Thanks guys🤙🏾 Ferdinando De sena2025-07-03Trustindex verifies that the original source of the review is Google. Excellent service from start to finish. Total Damp Repair LTD were prompt, professional, and thorough in resolving our damp issues. The team explained everything clearly and left the property clean and tidy. Highly recommended! Chris Williams2025-07-03Trustindex verifies that the original source of the review is Google. Great experience—clean work, no more mould, and helpful team. Mimzee Brewer2025-06-30Trustindex verifies that the original source of the review is Google. We had a persistent mould and damp issue in our property in Vauxhall, and Total Damp Repair LTD were outstanding from the first call. The team was punctual, professional, and clearly experienced. They carried out damp proofing, mould treatment, and replastering—all to a really high standard. The property looks and feels completely refreshed, and the damp smell has gone. Honest, efficient, and great value for money. Highly recommended!
What Is PIV Unit Installation and Why Does It Matter?
At Total Damp Repair LTD, our PIV Unit Installation service is designed to provide a long-term solution to condensation, poor ventilation, and mould problems in residential and commercial properties. PIV stands for Positive Input Ventilation a system that gently introduces clean, filtered air into the home from a central unit, usually installed in the loft. This continuous airflow pushes out excess moisture and stale air, significantly reducing the risk of damp-related damage.
Our PIV units are ideal for properties suffering from high humidity, black mould growth, or persistent condensation on walls and windows. These issues often go hand in hand with poor indoor air quality and inadequate ventilation, especially in well-insulated or airtight buildings. By installing a PIV unit, we ensure that your indoor environment remains dry, fresh, and healthy without the need for costly building alterations or disruptive works.
What sets Total Damp Repair LTD apart is our deep understanding of ventilation systems and the damp challenges common to homes across London. Every installation is carried out by trained specialists who assess your property’s layout, air flow, and moisture levels before recommending the best solution. Our systems are energy-efficient, low-maintenance, and discreetly installed to blend seamlessly with your home. With us, you’re not just improving air circulation you’re safeguarding your property and your health.

Positive Input Ventilation (PIV) Unit Installation Process
At Total Damp Repair LTD, we make PIV unit installation simple, efficient, and tailored to your property. Here’s how we ensure a smooth and effective process:

We begin with a thorough survey of your home to assess current ventilation levels, sources of condensation, and moisture buildup. This helps us determine whether a PIV unit is the right solution and where it should be placed for maximum effect.

Our experienced technicians discreetly install the PIV system, usually in your loft or hallway ceiling, ensuring minimal disruption to your home. The unit is connected to a filtered air supply and calibrated to suit the specific size and layout of your property.

Once installed, we test airflow, check humidity levels, and make necessary adjustments to optimise performance. You’ll receive clear guidance on how the system works and how it continues to maintain healthy air circulation year-round.
Benefits of Our PIV Unit Installation Service
Choosing Total Damp Repair LTD for your Positive Input Ventilation (PIV) system means more than just installing a machine it’s about improving your home’s air quality, protecting your property, and investing in long-term wellbeing. Here are seven clear benefits of our expertly installed PIV systems:
- Eliminates Condensation and Black Mould
PIV systems introduce a steady flow of fresh, filtered air that replaces the humid, moisture-laden air inside your home. This consistent airflow helps eliminate condensation from cold surfaces like windows and walls cutting off the conditions that allow mould to grow and spread. - Improves Indoor Air Quality
Many homes suffer from poor air circulation, especially those that are well-insulated or lack natural ventilation. A PIV unit constantly pushes out stale air and replaces it with filtered, cleaner air reducing allergens, pollutants, VOCs, and other airborne irritants inside the property. - Helps Prevent Respiratory Issues and Allergies
By removing excess moisture and airborne contaminants, PIV units create a healthier indoor environment. This is particularly beneficial for those with asthma, allergies, or other respiratory sensitivities, making your home safer for the whole family. - Cost-Effective and Energy-Efficient Solution
PIV units are extremely efficient to run many systems consume less energy than a traditional light bulb. This low energy consumption makes them an affordable, long-term solution to condensation and damp without running up your energy bills. - Low Maintenance with Long-Term Benefits
Once installed, PIV systems require minimal upkeep. The filters typically need replacing only once or twice a year, and the units operate quietly and automatically in the background, giving you ongoing moisture control without constant attention. - Quick, Non-Invasive Installation
Our trained specialists install the unit with no structural disruption. Most installations take just a few hours and don’t require major alterations to your property, making it a convenient solution for both new and existing homes. - Tailored to Your Home by Local Experts
At Total Damp Repair LTD, we don’t believe in one-size-fits-all. We assess your property’s layout, current airflow, and damp conditions before installing a system that’s calibrated for your specific needs — ensuring reliable results and lasting peace of mind.
Why Should You Install a PIV Unit?
Stops Condensation and Prevents Mould at the Source
PIV units eliminate one of the main causes of mould condensation. By continuously supplying fresh, filtered air into your home, the system lowers humidity levels and stops moisture from building up on cold surfaces like windows and walls. This prevents black mould before it has a chance to grow.
Improves Health and Air Quality Indoors
Poor ventilation traps allergens, dust mites, and pollutants inside your home. A PIV system expels stale, contaminated air and replaces it with clean, filtered air helping to reduce asthma triggers, allergic reactions, and general respiratory discomfort.
Energy-Efficient and Cost-Effective
Unlike extractor fans or dehumidifiers that consume more electricity and require manual operation, PIV units are energy-efficient and run quietly in the background. They use very little power while providing continuous ventilation, making them a smart long-term investment.
Ideal for Both Prevention and Aftercare
Whether you’re dealing with existing damp or want to stop condensation problems from ever occurring, PIV units are highly effective. They work especially well in combination with other damp-proofing treatments, supporting a dry, healthy environment all year round.

Why Choose Total Damp Repair LTD?
Specialized Expertise in Mould and Damp Solutions
Our team is extensively trained in mould remediation and damp proofing, ensuring you receive the most effective and knowledgeable service possible.
Advanced Diagnostic Tools and Techniques
We utilize state-of-the-art equipment like thermal imaging and moisture meters to accurately assess the extent and source of damp issues, allowing us to address problems at their root.
Customized Treatment Plans
Every property is unique, so we tailor our services to fit your specific needs, whether it’s for a home or a commercial building, ensuring maximum effectiveness and protection.
High-Quality, Durable Materials
We only use top-quality materials for our treatments, guaranteeing that our solutions provide long-lasting protection against mould and damp.
Eco-Friendly and Safe Practices
Our commitment to the environment and your safety means we use non-toxic, eco-friendly products and follow best practices to ensure your property remains healthy and safe.
Comprehensive Service Offering
From initial inspection and diagnosis to remediation and preventative treatments, we provide a full range of services to cover every aspect of mould and damp management.
Transparent Communication and Detailed Reporting
We believe in keeping you informed at every stage. Our team provides detailed reports, findings, and recommendations so you understand our work and feel confident in our solutions.
Customer Satisfaction Guarantee
We are dedicated to ensuring you are completely satisfied with our work. We stand by our services with a guarantee, offering peace of mind and confidence in the long-term results.
Mould Cleaning and Treatment Step-by-Step
1
Initial Damp & Ventilation Survey
We begin by assessing your property for condensation, mould, and poor airflow. This includes checking humidity levels, existing ventilation routes, and insulation quality to determine the suitability and placement of the PIV unit.
2
Bespoke System Recommendation
Based on your home’s size, layout, and damp conditions, we recommend the most effective PIV unit and airflow settings to meet your specific needs. We’ll explain how it works and what results you can expect.
3
Professional Unit Installation
Our experienced technicians install the PIV unit in the loft space or central hallway ceiling, ensuring minimal disruption. The unit is connected to an external air source and fitted with filters for clean airflow.
4
System Calibration & Testing
Once installed, we test the unit to ensure it’s supplying the correct airflow rate and operating efficiently. We fine-tune the settings to suit your environment and check for consistent distribution throughout the property.
5
Aftercare Advice & Support
We provide clear instructions on filter maintenance, operational tips, and what to expect in the coming weeks. Our team remains available for follow-up support to ensure long-term performance.
Before and After Results



Having Trouble with Mould and Damp?
Choose Total Damp Repair LTD.
We’re available in Epsom, Hayes, London, Surrey, Sutton, Bromley, Croydon, Watford, Dartford, Richmond, Guildford, Weybridge, Twickenham, London SW10, Fulham, Greater London, Walton-on-Thames, Victoria (London SW1), Westminster (London SW1), Royal Borough of Kensington, Chelsea AND MORE.
Frequently Asked Questions
A Positive Input Ventilation (PIV) unit works by drawing in fresh, filtered air from outside (usually via a loft space) and gently ventilating the home. This displaces stale, moisture-laden air, reducing condensation and improving indoor air quality.
Most PIV units can be installed in just a few hours. The process is non-invasive and doesn’t require major structural work, making it a quick and convenient solution for most homes.
No PIV units are extremely energy-efficient. Most models run on very low wattage (similar to a light bulb), so they provide round-the-clock moisture control without driving up your energy bills.
Yes, by reducing excess humidity and preventing condensation, a PIV unit eliminates the damp conditions mould needs to grow. It's an effective long-term solution for tackling black mould at the source.
Very little. The main requirement is replacing or cleaning the filter every 6–12 months, depending on the model and air quality. We provide guidance and support to help you keep the system running smoothly.