Insulated Homes Exchange Less Air
Insulation and draught-proofing reduce uncontrolled airflow. Helpful for warmth and energy, but moisture and stale air have fewer routes out.
Ventilation & Extraction In South Wales
Reduce condensation, humidity and stale air with the right ventilation strategy, assessed for your whole home, not just one room.
- PAS 2030 Certified
- Whole-House Assessment
- Insurance-Backed Guarantee
- Free Assessment
- Inspection-Led
- PAS 2030 Certified
- Whole-House Assessment
- Insurance-Backed Guarantee
- Free Assessment
- Inspection-Led
Get Started
Book Your Free Assessment
Submit your details and we'll arrange a free, no-obligation whole-house ventilation assessment.
We Look At The Whole Home. We assess moisture sources, current ventilation, humidity and any airtightness changes after insulation before recommending.
PAS 2030 Certified, Whole-House Assessment, Insurance-Backed Guarantee
Assessment Evidence
Condensation And Mould Are Symptoms, Not The Diagnosis
As homes are insulated and draught-proofed they exchange less air with the outside. Without a path out, moisture from cooking, showering and drying clothes lingers and lands on the coldest surfaces. We assess the whole home, moisture sources, current ventilation and humidity, before recommending a strategy.
- Window Condensation
- Black Mould
- Musty Smells
- Cold-Spot Patterns
- Post-Insulation Humidity
- Wet Rooms
Why It Matters
A Whole-House Approach To Air And Moisture
As homes are insulated and draught-proofed, they exchange less air with the outside. The right ventilation strategy keeps moisture, humidity and stale air in check so the fabric works as intended.
Moisture Builds Up Without A Path Out
Cooking, showering, drying clothes and breathing all add moisture to indoor air. Without ventilation it lingers and lands on the coldest surfaces.
Ventilation Supports Air Quality
Continuous, controlled airflow helps manage condensation and keeps indoor air fresher. The right strategy depends on the home, not a single product.
What We Often See
Common Patterns We Assess
These are common indicators that ventilation may be part of the picture. We assess each one in context rather than jumping to a conclusion.
Window Condensation
How We Check
We measure indoor humidity and surface temperatures, and check whether moisture sources are matched by adequate extract.
- Indoor Humidity
- Surface Temps
- Extract Match
Black Mould In Corners Or Behind Furniture
How We Check
We look at cold-spot patterns, ventilation paths and how rooms are used, alongside any fabric or insulation factors.
- Cold Spots
- Ventilation Paths
- Room Use
Musty Smells
How We Check
We assess air movement through the home and check whether existing extract is working or has stopped performing.
- Airflow
- Existing Extract
- Performance
Higher Humidity After Insulation Or Draught-Proofing
How We Check
We take humidity readings, review what was done to the fabric, and re-balance the ventilation strategy to suit.
- Humidity Readings
- Fabric Changes
- Re-Balance
Options
Ventilation Options, Matched To Your Home
There is no single right product. The strategy depends on the property, how it is used and what has already been done to the fabric.
Positive Input Ventilation (PIV)
A loft or wall-mounted unit gently introduces filtered air to the home, helping displace moist, stale air through existing leakage paths. Matched to your home.
MEV / dMEV (Continuous Extract)
Continuous low-level extraction from wet rooms with boost on demand. Suited to homes where targeted, quiet extract is the right approach. Matched to your home.
Intelligent / Humidistat Extraction
Humidity-sensing fans that respond to actual moisture levels in bathrooms and kitchens, rather than just running on a timer. Matched to your home.
Trickle Vents
Background ventilation through window or wall vents, used where the strategy calls for passive make-up air alongside mechanical extract. Matched to your home.
Our Process
1
Assessment
We look at the whole home: moisture sources, current ventilation, humidity readings and any airtightness changes from insulation or draught-proofing.
2
Strategy
A written recommendation explaining the ventilation approach for your home, why it suits the property, and how it coordinates with any insulation works.
3
Install
Qualified installers fit the unit, ducting and grilles cleanly, with controls and humidistats set up to suit how the home is actually used.
4
Verification
Airflow commissioned and recorded, controls demonstrated, documentation issued and the work covered by an insurance-backed guarantee.
Timeline
Property-Specific
Team
1-2 Installers
Approach
Whole-House
Guarantee
Insurance-Backed
Payment
On Completion
Coordinated With Insulation
We Balance Airtightness With Airflow
Insulation and ventilation are two halves of the same job. When fabric is upgraded, airflow needs to be re-considered so the home stays comfortable and the fabric performs as intended.
Installation Day
What Happens On The Day
Step 01 Of 04
Position The Unit
What We Do
- Position the unit in the loft or on the wall in the agreed location
Social Housing & Commercial
Condensation & Mould Response For HAs & Landlords
We support housing associations, landlords and managing agents on their duties to act on damp and mould, with communal ventilation, tenant guidance, reporting and completion documentation, in a calm, compliance-minded way.
Pricing
What Affects Your Quote
Ventilation quotes are property-specific. We base your written quotation on these key variables, confirmed at the free assessment.
Property Size
Ventilation Type
Number Of Wet Rooms
Ducting & Access
£ Finance
Finance Options:
Spread The Cost
Monthly payment options are available for ventilation and extraction system installations, provided through our partner Ideal4Finance, with 0% finance available on selected agreements.
Choose a term that suits your household, see the full agreement before you commit, and pay a fixed monthly repayment for the length of the term.
Finance is a regulated credit agreement arranged through Ideal4Finance. You apply directly, the agreement is subject to status, and you'll see the full terms, including the total amount repayable, before you sign anything.
Your Payment Options
Monthly Payment Options
Spread the cost over an agreed term with a fixed monthly repayment.
Full Terms Up Front
Every agreement shows the complete cost and term before you commit.
No Obligation
Finance is a payment option, not a requirement. You can pay for your installation without it.
Find Out If You're Eligible
Enter your postcode below to check your eligibility and explore finance options for your installation.
Document
Commissioning Record
Your Handover Pack
Everything documented on completion, so the system is commissioned, warrantied and set up for your home.
Commissioning Record
Airflow commissioned and recorded to confirm performance.
Manufacturer Warranty Registration
Registered for your ventilation unit.
Controls Setup
Humidistat thresholds and controls configured and demonstrated.
Aftercare Guidance
How to use and maintain the system over time.
Whole-House Ventilation, Properly Commissioned
Ventilation is not a single product bolted on a wall. We treat it as a whole-house strategy: assessed, designed, installed and verified by qualified people, and coordinated with any insulation works so airflow and fabric balance correctly.
Real Homeowner Reviews
Loved By Homeowners, Trusted By Experts
We're proud to help South Wales homeowners protect the property they live in every day. Here is what some of our customers have shared after working with us.
PAS 2030 Certified
After loft and cavity insulation we started seeing window condensation. CRS assessed the whole house, fitted a PIV and replaced our bathroom fan. The mornings are noticeably drier now.
Quiet install, tidy ducting and they walked us through the controls before they left. They were clear that it manages condensation rather than promising to cure mould, which I appreciated.
4.6
Rated 4.6 On 50 Google Reviews
4.6
Rated 4.6 On 55 Trustpilot Reviews
Transparent Pricing
Every Quote Is Built Around Your Property - Not A Price List.
No guesswork. No off-the-shelf packages. We assess moisture sources, ventilation and humidity across the home, so you only pay for the strategy your property actually needs.
Property Size
The size of the home shapes the whole-house strategy.
Ventilation Type
PIV, continuous extract (MEV/dMEV) or a combination, matched to the property.
Number Of Wet Rooms
Bathrooms and kitchens drive the extract requirement.
How It Works
- 1We assess the whole home, moisture sources, current ventilation and humidity
- 2We match a ventilation strategy to the property
- 3A written, property-specific quotation is issued
- 4No off-the-shelf packages, no single-product default
Ready To Get Your Quote?
Get in touch and we'll arrange your free whole-house ventilation assessment. We'll assess moisture, humidity and airflow, then issue a clear, property-specific quotation.
Frequently Asked Questions
Ventilation helps manage condensation and supports indoor air quality, but it is rarely the whole story. We assess the home first to understand the moisture sources and the fabric, and we describe what the ventilation will and will not do honestly. We do not promise to cure mould from a single product fit.
Neither is automatically better. PIV introduces filtered air to dilute and displace moist air through existing leakage paths, while continuous extract (MEV / dMEV) removes moisture at source from wet rooms. The right choice depends on your property, layout and how the home is used, which is why the assessment comes first.
Modern PIV, MEV and humidistat extract fans are designed for continuous low-level running and are typically very quiet in normal operation. Boost modes are louder but short-lived. We size and locate units to keep noise unobtrusive.
Often, yes. Insulation and draught-proofing reduce uncontrolled airflow, which means the existing ventilation may no longer be enough. We frequently assess ventilation alongside or after insulation upgrades to keep airflow and airtightness balanced.
Continuous ventilation systems are designed to use very low power in normal operation. Exact running costs depend on the unit, settings and tariff, so we describe running cost qualitatively rather than quoting a fixed figure.
Yes. We work with landlords, managing agents and housing associations on condensation and mould response, communal ventilation, tenant guidance, reporting and completion documentation, in a non-alarmist and compliance-minded way.
Book Your Free Ventilation Assessment
Complete the form and we'll arrange your free, no-obligation whole-house ventilation assessment. Or call 0800 009 2992.