Ventilation · Condensation & mould

Condensation and mould, dealt with at the source.

Streaming windows every morning, black mould in bathroom corners and behind wardrobes, a musty smell in the back bedroom. Most of it is moisture with nowhere to go. We find where it is coming from and fit ventilation that removes it quietly.

Book this service Call 020 7946 0182

Gas Safe registered
MCS heat pumps
F-Gas certified

What’s included

The work, done properly.

Assessment of moisture sources, humidity and existing ventilation
Quiet, humidity-controlled bathroom and kitchen extractor fans
Continuous extract fans and positive input ventilation (PIV) units
Single-room heat recovery fans for bathrooms and kitchens
Whole-house ventilation with heat recovery (MVHR) for renovations
Ducting rerouted so fans vent outside, not into the loft

Signs you need this

Windows streaming with condensation most mornings
Black mould on walls, ceilings or window reveals
A bathroom fan that is noisy, weak or does not run on
Damp smells in rooms with little airflow
New windows and insulation have left the house feeling stuffy

Condensation mould and penetrating or rising damp can look alike, but they need different fixes. Mould on cold outside walls, window reveals and behind furniture is usually condensation: warm, moist air from cooking, showers and drying washing meeting a cold surface. Damp at the base of a wall or below a leaking gutter is a building problem, and a fan will not cure it. If that is what we find, we tell you rather than sell you a fan.

Older houses used to breathe through draughty sash windows, open chimneys and gaps in the floorboards. Seal those with double glazing and insulation and the moisture stays inside. In many Victorian terraces and 1930s semis, a good humidity-controlled extractor in the bathroom and kitchen, or a positive input ventilation unit in the loft, is enough. Tighter renovations may justify whole-house heat recovery.

For landlords, damp and mould is a tenant health issue that councils take seriously. Working ventilation, and a record that it was fitted and tested, is part of the answer.

How it works

Survey

We measure humidity, test the existing fans and look for where the moisture comes from.

Recommend

The simplest ventilation that solves the problem in your property.

Install

Fans, ducting and controls fitted neatly, with a qualified electrician for any new circuits.

Check

Extract rates and humidity controls tested before we leave.

Gas Safe registeredEvery gas job is done by an engineer on the Gas Safe Register.
MCS-certified heat pumpsRequired for Boiler Upgrade Scheme grants.
F-Gas certifiedAir conditioning and refrigerant work done to the regulations.
Fully insuredPublic liability cover, with certificates for freeholders and agents.

Book ventilation, condensation & mould

Tell us what’s going on.

Send the address and a few details. We’ll confirm timing and next steps, and you’ll get a written price before any work starts.

Prefer to talk? 020 7946 0182

Questions

Ventilation, condensation & mould, answered.

Condensation and black mould: fixing the cause

Will an extractor fan stop the mould?

If the mould comes from condensation, a properly sized, humidity-controlled fan that genuinely vents outside usually makes a big difference. On its own it will not fix a leak, rising damp or a cold spot in the structure, and we will tell you if we think that is the problem.

What is positive input ventilation?

A unit, usually in the loft, that gently pushes filtered air into the house through a ceiling vent on the landing. It dilutes moist air and moves it out through the natural gaps in the building. Wall-mounted versions suit flats without a loft.

Can you fit fans in a rented flat?

Yes. We work with landlords and letting agents, and in leasehold blocks we check whether new outside vents need the freeholder’s consent.

Related services

Ready when you are

Tell us about your home.

Book an engineer Call 020 7946 0182