Condensation and mould ventilation fixes in Dorset

For tenants, landlords and homeowners in Dorset, the common question is why the mould keeps coming back.

Dorset has every kind of building, from old terraces to new estates and business parks, and every job is designed around the building in front of us, not a standard kit.

Condensation & mould in Dorset at a glance

Area: Dorset
Towns listed: 14, largest Bournemouth
Postcode districts: BH11, BH21, DT1, DT2, BH17 and BH18
Price region: South West
Survey: Free survey (UK mainland)

What the work involves

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. We tell you if that is what we find rather than selling a fan that will not help.

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.

Survey and findings

Humidity and surface readings, existing fans flow-tested, and a written list of causes and fixes.

Guide prices in Dorset

Condensation and mould ventilation fixes guide prices in Dorset
Work	Guide price
New ducted fan to outside through the loft or ceiling (insulated duct, roof or soffit outlet) (per fan)	£465–£775 inc VAT
Positive input ventilation (PIV) loft unit, supplied and fitted (per home)	£825–£1,450 inc VAT
Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan)	£360–£625 inc VAT
Condensation and mould ventilation survey with written findings (per home)	£130–£235 inc VAT

These ranges use our South West rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.

When to get it looked at

Someone in the home with asthma or allergies made worse by damp
Black mould on window reveals, ceilings or behind furniture
Water running down windows on cold mornings

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 Dorset

Questions about condensation and mould ventilation fixes in Dorset

Are prices different in Dorset?

Our guide prices are adjusted by region. In Dorset we use South West rates, so new ducted fan to outside through the loft or ceiling (insulated duct, roof or soffit outlet) is typically £465 to £775 inc VAT per fan.

Is black mould dangerous?

Damp and mould can affect health, particularly for people with asthma, allergies, weak immune systems, children and older people, according to NHS and government guidance. It should be dealt with rather than lived with.

Is PIV or MVHR better for condensation?

For most existing homes with general condensation, PIV plus good extract fans is the most cost-effective fix. MVHR suits airtight, well-insulated homes and full renovations.

Is the survey free in Dorset?

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.

Which rules apply to ventilation in Dorset?

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.

Send us photos of the mould and your fans and we will give a first view for your Dorset home.