Serving Belfast & all of Northern Ireland
Fully Insured 07711 459450 info@pivinstallerni.com
★★★★★ Northern Ireland's PIV Specialists

PIV Unit Installation Specialists

Condensation, damp and black mould in your home? Get the positive input ventilation you need — supplied and fitted by local NI engineers. Fixed prices from £749 fully installed, backed by a 7-year warranty.

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Local NI Engineers
7-Year Warranty
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No home survey needed to see a price. Answer a few quick questions and we'll show your recommended PIV packages instantly.

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Quick, simple, no obligation

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House with Loft
Has an attic space (Standard installation)
Flat / No Loft
No loft access (Requires wall unit)
Please select a property layout to continue.
1–2 Beds
Apartment or small terrace
3 Beds
Standard semi-detached / terrace
4+ Beds
Large detached / multi-storey
Please select your number of bedrooms to continue.
Condensation
Wet windows & running water
Black Mould
Mould on ceilings, walls, or clothing
Musty Smells
Damp, stale smell in the rooms
Compliance / Health
Landlord duty of care / asthma control
Please select your primary moisture issue.
Please enter a valid Northern Ireland postcode (starting with BT).

100% Free · No Obligation. We'll check surveyor availability in your area.

Rated Excellent on Trustpilot ★ ★ ★ ★ ★ Average 4.9/5 from 120+ verified local Northern Ireland reviews
How It Works

Click, Choose, We Fit

Our simplified online process saves you time and guarantees the best PIV installation rate.

Step 1

1. Click

Complete our 60-second online quote survey. Input your house layout and contact details to see prices instantly.

Step 2

2. Choose

Select your recommended PIV package. Opt for the standard unit, tempering heater, or compact wall unit.

Step 3

3. We Fit

Our certified Northern Ireland engineers install the system in 2 hours with no structural mess or damage.

The Problem

Is damp and mould ruining your home?

Northern Ireland's wet climate makes condensation and mould a major structural and health issue. Traditional venting methods are often ineffective. Typical symptoms include:

  • Morning Condensation: Heavy water droplets running down windows.
  • Black Mould: Spreading in wall corners, window frames, and ceilings.
  • Musty Odours: Stale, damp air trapped in wardrobes, fabrics, and carpets.
  • Ruined Redecorating: Repainted walls peeling or growing mould again in weeks.
  • Allergies & Asthma: Breathing issues aggravated by mould spores and dust mites.
The Solution

Positive Input Ventilation (PIV)

PIV is the UK's most popular permanent cure. It tackles the root cause by displacing moisture-laden air rather than simply covering up the damp symptoms.

  • Cures Mould & Condensation: Stops them from forming by diluting humidity.
  • Continuously Filters Air: Pushes fresh, clean air throughout your home 24/7.
  • Low Running Cost: Consumes only 10W–15W, costing about £12–£15 a year.
  • Fast 2-Hour Installation: Fitted quickly with zero structural disruption.
  • Landlord & HMO Compliant: Satisfies Building Regulations Part F (NI).
Learn How PIV Works →

What poor ventilation looks like in NI homes

If any of this looks familiar, it's not a decorating problem — it's a ventilation problem, and PIV cures it.

Severe black mould spreading across a wall corner and skirting board in a Northern Ireland home
Black mould taking hold in a corner — a clear sign of excess humidity and poor ventilation.
Heavy condensation and mould around a cold window reveal in a Northern Ireland property
Streaming condensation and window mould — exactly what Positive Input Ventilation stops at the source.
PIV Installer NI engineer standing beside the fully branded company van in Northern Ireland ★ Our local NI team & fleet
Local & Accredited

Fitted by your local NI engineers

No subcontractors and no call centres. Our own time-served engineers install every PIV unit — neatly mounted in the loft, fully wired, tested and demonstrated before we leave. Most homes are completed in under two hours.

  • Tidy, professional fit: Insulated ducting and a clean ceiling diffuser.
  • Tested & demonstrated: We set the airflow and show you exactly how it works.
  • Insured & guaranteed: Fully insured work, backed by a 7-year warranty.
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Spot the Signs

Signs your home needs better ventilation

Many homeowners don't realise they have a ventilation problem until the damage is done. If you recognise any of these, PIV will help.

Streaming windows

Water droplets forming on glass and sills every morning that you have to wipe down.

Black mould spots

Dark patches creeping across ceilings, wall corners, window seals, or behind furniture.

Musty, stale smell

A damp odour that lingers in wardrobes, soft furnishings, and rooms even after airing.

Worse allergies & asthma

Sneezing, congestion, or disrupted sleep aggravated by mould spores and dust mites.

Damp clothes & fabrics

Clothing, bedding, or curtains that feel cold and damp to the touch.

Peeling paint & wallpaper

Freshly decorated walls bubbling, peeling, or growing mould again within weeks.

Check My Home in 60 Seconds →
Benefits

Why Positive Input Ventilation is the best choice

Healthier Indoor Air

Filters out pollen, dust mites, and outdoor allergens while continuously diluting indoor volatile organic compounds (VOCs) and stale CO2.

Incredibly Low Running Cost

Ultra-efficient DC motors mean the system consumes less power than a low-energy LED bulb. Significantly cheaper than running a noisy, heavy dehumidifier.

Protects Property Structure

Stops water from collecting on timber joints, drywall, and plaster, preventing long-term timber rot and wallpaper peeling.

Near-Zero Maintenance

Install and forget. The robust medical-grade filters inside the unit only need to be replaced once every 4 to 5 years.

Up to 7-Year Warranty

We source and install market-leading Nuaire units. Your system is fully covered by an extensive manufacturer warranty of up to 7 years.

HMO & Tenant Compliant

Ensures rental properties meet the required ventilation compliance standards, keeping tenants healthy and protecting your asset.

Transparent Pricing

One fixed price. Fully installed.

No hidden fees. No upselling. No surprise call-out charges. The price you see is the price you pay — including the unit, all electrical work, testing, and certification.

  • Full home ventilation assessment included
  • Supply & professional installation
  • EIC electrical certificate with every install
  • Up to 7-year manufacturer warranty
  • All work fully insured
Fully installed from
£749
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Peace of Mind

Qualified, insured & guaranteed

Fully Insured Comprehensive public liability cover
EIC Certificate Electrical certification on every job
Nuaire Trained Authorised installation specialists
Vetted Engineers Local, background-checked team
Reviews

What Northern Ireland Homeowners Say

★★★★★

"We struggled with severe window condensation every winter, wiping sills daily. PIV Installer NI installed the heated Drimaster unit in November, and within a week the windows were bone dry. Exceptional service."

Margaret T.
East Belfast
★★★★★

"Brilliant company. As a landlord managing several older terraced houses in Belfast, mould complaints were a constant headache. These guys fitted PIV systems in three houses, and the tenants are delighted. No mould since."

David R.
Lisburn Road, Belfast
★★★★★

"Quick, clean, and completely solved our mould problem in our bungalow. The engineers arrived at 9am and were done by 11:30. Explained everything, left no mess. Highly recommend."

Patricia M.
Newtownabbey
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Service Coverage

Local PIV Specialists Serving Northern Ireland

Based in Belfast, we cover Greater Belfast and towns across the region. Typical service areas include:

Belfast City East Belfast South Belfast Lisburn Newtownabbey Bangor Newtownards Holywood Carrickfergus Ballymena
Larne
Craigavon Derry / Londonderry Antrim
Downpatrick
Banbridge

Ready to clear condensation and mould permanently?

Get your fixed online quote today. Most properties surveyed and installed within 5 business days.

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