damp and mildew

[Boltonlass1972]

Ok, so my house is 64 years old, has rubbish double glazing and yes, we do have to dry some washing in the house(use a dryer for most) Surely the washing and bathroom/kitchen steam is a product in most houses, but here's what my house gets room by room:
Kitchen: no heating, black walls behind the moveable appliances
Hall: black mildew on pipes and another coloured mould under the stairs. Windowsill paint cracks.
Lounge: some mould grew on the back of a picture on the windowsill and the painted windowsill cracks. We have to keep furniture away from the walls to allow air flow
Dining room: some mildew stuff grows on the wood furniture and speaker grilles
Bedrooms: mildew on any outside wall that is covered with furniture
Bathroom: black mildew grows on cold pipes.
Obviously I don't let it stay like this and I know how to clean /air it but had anyone with building experience a suggestion of why our particular house is worse than others with similar age houses that don't get this? We can't afford to rack the heating up really high. Any suggestions most appreciated. We have cavity wall insulation (which didn't really change anything) and have been here 7 years. We get terrible condensation.
Thanks

extractor in bathroom and kitchen; and use them. a typical extractor will run for 50 hours on 14p worth of electricity.

Our house is 80 years old, no extractors in kitchen or bathroom, no heating in kitchen, and we also have to dry washing indoors when the weather is dodgy. No mould here, presumably because I'm a tyrant for ventilation.

The windows are locked open a crack unless it's -15degC outside (this may be a slight exaggeration). Husband does try to sneak them fully closed from time to time, but I'm pretty vigilant. Also, curtains are all opened every morning. Bathroom window is properly open unless we're out, when it's locked to vent like the rest. Kitchen windows properly open whenever anything's boiling. Any window gets opened if there's visible condensation in the room.

Washing gets dried in one room on a heated airer. The door to that room is closed, and the window open if at all possible. Wish we had a utility room, or even a garage for this, but it hasn't caused any problems.

You need to spring clean, with a weak solution of bleach and water to rinse down mouldy areas, or HG produce a mould and mildew remover. Open the windows for several hours each day (say 3-4) including while any washing is drying. If you are loath to crank up central heating, you could consider lighting real fires to help the circulation in the house - that is what people did before central heating. Alternatively there's a case for taking the washing to the laundrette for a service wash which saves you time as well as having a damp house.

We had this in a previous house. We installed air vents in the main bedroom and living room, and got a dehumidifier which helped enormously.

Yes, air bricks might well help.

What Piglet John says, and consider buying a dehumidifier.
Then once the condensation has resolved itself, clean with bleach as per Boffin.

Thanks guys. How much does it cost to have air vents installed please?

Not sure, about £50 per air brick?

It can also be that the air bricks (which given its age, you would expect your house to have) are blocked by builders rubble. Maybe worth checking. Air bricks are really important. Ventilation is key.

You could try something like this www.wilko.com/insulation/kilrock-slimline-moisture-trap-500g/invt/0135521?VBMST=&VBMTC=71971e598211e1d604b3e15ca31f9125 just until you can afford to make more permanent alterations to your home. They are toxic though so dont let children /pets near them.

Have realised that because we have Chimney breasts in 4 rooms we do have vents and there is an old fashioned air brick vent thing in one bedroom and the bathroom but I agree, it may be worth checking for rubble. May try a Hoover attachment and torch. Thanks x

Do your fireplaces actually work?

Boffinmum; no all 4 are blocked up

disused chimneys must be ventilated top and bottom or they will get wet from condensation inside. an airbrick sized hole is enough. You can put a plastic or brass grille over it.