PIV Installation

⭐ Introduction

A Positive Input Ventilation (PIV) system is designed to improve the air quality inside your home by gently introducing fresh, filtered air to reduce humidity, stale air, and condensation. It’s especially useful in UK homes prone to damp or mould, common in older properties or those with poor ventilation.

You might consider a PIV installation if you’ve noticed persistent condensation on windows, damp patches on walls, or musty smells. It’s a practical way to create a healthier living environment, reducing the risk of mould growth and related health issues without needing structural work like replacing walls or windows.

🔧 What the job involves

Installing a PIV system means fitting a small fan unit—usually in the loft or an airing cupboard—that draws in fresh air from outside, filters it to remove dust and pollen, then gently distributes it through the home, often via ceiling vents.

The system works continuously but quietly, creating a slight positive pressure inside. This fresh air pushes out stale, moist air, reducing condensation and improving air quality.

A qualified electrician will carry out the installation since the system requires an electrical supply and must be integrated safely with your home's existing wiring. The work typically includes:

• Checking your property’s layout and ventilation needs.
• Installing the fan unit in a suitable, accessible location.
• Running ducts or pipes that gently release fresh air into your main living spaces.
• Connecting the unit to your electrical supply safely and in compliance with UK electrical regulations.
• Testing the system to ensure it runs correctly and efficiently.

📝 Step-by-step from booking to completion

1. Initial enquiry: Contact a reputable, qualified electrician or ventilation specialist offering PIV installation.
2. Survey and quote: The electrician will visit to assess your home, discuss your ventilation needs, and provide a written quote.
3. Agreeing the work: Review and approve the quote, scheduling a convenient date for installation.
4. Pre-installation preparation: Ensure loft or cupboard access is clear, and any delicate items are protected.
5. Installation day: The electrician installs the unit, ducts, wiring, and vents, then tests everything.
6. Explaining use and maintenance: You’ll be shown how the system operates and given advice on upkeep.
7. Documentation: The electrician should provide any relevant certificates or guarantees.
8. Aftercare: Arrange any recommended servicing to keep your system running efficiently.

💷 Main costs to expect

• Labour: Electrician’s time for survey, installation, and testing — typically £150–£300.
• Materials and parts: PIV unit, ducting, vents, fixings — roughly £200–£500 depending on system size and quality.
• Additional electrical work: Wiring upgrades if needed, or connection to consumer unit — £50–£150.
• Disposal: Removal of old units or packaging — usually modest or included.
• Certification: Electrical works notifiable under Part P of Building Regulations may require certification — often included in labour quote.

Example:
PIV system (£300) + labour (£200) + minor cabling (£75) = £575 total.

📊 What affects the price

• Property size and number of rooms to ventilate.
• Accessibility of installation areas (loft stairs, cramped spaces).
• Complexity of duct routing—straightforward runs cost less.
• Electrical system condition—may need upgrades.
• Whether additional ventilation work is required (e.g., vent modifications).
• Location and call-out fees.
• Urgency or weekend/evening work.
• Compliance with Building Regulations (Part P) and warranty requirements.

⏱ How long does it take?

• Straightforward installations: 3–5 hours for a single-unit system in an easily accessible loft.
• More complex setups: Full-day (6–8 hours) if multiple ducts or electrical upgrades are needed.
• Additional time if remedial work or planning for ventilation layout is involved.

🏠 Can you DIY it?

Installing a PIV system involves electrical wiring and must comply with UK electrical safety regulations (Part P). For safety, building compliance, and insurance reasons, this job isn’t recommended as a DIY project unless you’re a qualified electrician.

Incorrect installation risks electrical faults, poor ventilation performance, or damage to your home. Hiring a Gas Safe registered installer is not required for PIV (it’s not gas-related), but using a qualified electrician is essential.

💰 Typical UK price range

You can expect to pay approximately £450 to £900 (including VAT at 20%) for a standard PIV installation in a typical UK home. Larger or more complex systems will cost more.

This is a general estimate; getting a personalised quote is important for accurate pricing.

✅ Handy tips before you start

• Clear loft or cupboard access before the electrician arrives.
• Ask about filter replacement schedules and costs.
• Keep all paperwork — invoices, certificates, and warranty documents — safe.
• Consider regular servicing every 1–2 years for optimal system performance.
• Check if your home insurance or warranty covers ventilation systems.
• Ensure the installer explains how to operate and maintain the system thoroughly.

Following these steps can help ensure your new PIV system works efficiently, improving your home’s air quality and comfort for years to come.