Condensation and mould ventilation fixes in Greater London

In Greater London, condensation and mould are usually at their worst between October and March.

We carry out condensation and mould ventilation fixes across Greater London, including Westminster, Bexley, Barking, Archway and Sutton. Prices use London rates. The survey is free for new installations on the UK mainland, and the quote that follows is fixed and in writing.

Condensation & mould in Greater London at a glance

Area: Greater London
Towns listed: 216, largest Brent
Postcode districts: HA4, HA5, SE3, SE7, EN4 and EN5
Price region: London
Survey: Free survey (UK mainland)

What condensation and mould ventilation fixes involves

Mould needs that damp surface to grow. Ventilation is usually the biggest part of the cure, but not the only part. Heating patterns, insulation gaps and cold bridges matter too, and some damp is not condensation at all: leaks, penetrating damp and rising damp need different trades.

Fan upgrades

Weak or loft-vented fans replaced and ducted outside, with humidity control.

Whole-home ventilation

PIV, continuous extract or MVHR where moisture is spread through the house.

Mould treatment advice

How to clean and treat affected areas once the cause is fixed.

Guide prices in Greater London

Condensation and mould ventilation fixes guide prices in Greater London
Work	Guide price
New ducted fan to outside through the loft or ceiling (insulated duct, roof or soffit outlet) (per fan)	£525–£900 inc VAT
Positive input ventilation (PIV) loft unit, supplied and fitted (per home)	£950–£1,675 inc VAT
Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan)	£415–£725 inc VAT
Condensation and mould ventilation survey with written findings (per home)	£150–£270 inc VAT

Guide prices using London rates. Prices include VAT at 20%. A guide price is not a quote: we confirm a fixed price in writing first.

Common reasons people call

Musty smell in bedrooms or wardrobes
Peeling paint or wallpaper in bathrooms
Damp patches that dry out in summer and return in winter

Rules in England

In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). Damp and mould is assessed as a hazard under the Housing Health and Safety Rating System in England.

How the job runs

Survey
Find the cause
Recommend
Fix
Check back

Towns we cover in Greater London

Questions about condensation and mould ventilation fixes in Greater London

Is the survey free in Greater London?

For new installations on the UK mainland, yes. The survey is free and the quote that follows is fixed and in writing. Servicing, testing and repair visits are charged, and we confirm the cost before booking.

How much does a condensation survey cost?

A ventilation survey with written findings costs £125 to £225 including VAT. If we are surveying for an installation we quote for, the survey is free.

Can you tell if it is rising damp?

We can tell you when the pattern does not look like condensation, such as a tide mark low on a wall or damp that appears after rain, and point you to the right specialist.

Which rules apply to ventilation in Greater London?

In England, ventilation in new and altered homes is covered by Approved Document F of the Building Regulations. Landlords also have duties under the Housing Health and Safety Rating System, and workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations 1992.

Which towns in Greater London do you cover?

All of Greater London, including Westminster, Bexley, Barking, Archway and Sutton. If your town is not listed, send the postcode and we will confirm.

We can log humidity in your Greater London home afterwards so you can see the improvement.