Water pressure gone in part of house

[Hepplewhitechair]

Hoping for some pointers please! Live in a town house that has two boilers on top floor, one for basement, ground and first floors, one for the two floors above. Plumbing has always been a bit annoying due to hot water having to travel a long way to some of the taps. For the last couple of days I’ve noticed a sudden drop of pressure in hot water to lower floors, to the extent that the bath on first floor took 1.5 hours to fill. But now it’s the cold water too, the cold tap is only running normally for a few moments in the kitchen before it turns to a dribble. Is there any obvious reason please why the water pressure would be okay on the top two floors, but not the bottom ones? Can’t believe this could go wrong so quickly!

Have you checked the boiler? Low water pressure usually means your boiler needs to re-pressurise and/or you may need your radiators bled if it hasn’t been done in a while. Worst case, you may have a leaky pipe.

Your kitchen cold tap is the first tap off the rising main. If it's starting OK then reducing to a dribble it might have an air lock in the supply.
Do the following

1. Turn the kitchen cold tap on and leave it on.
2. Locate your internal stop tap and turn it on snd off half a dozen times before leaving it on

This should bring the air bubble through . It might splutter a couple of times.
If this fails, contact your water company.

Muck in the pipe work. It must be settling in the various filters.
If you live in a hard water area and it's hot only, it could be scale breaking off inside the boiler. But if it's all taps it might be incoming muck.
Solution is to clean and service everything until it's fine again.

Thank you so much for these suggestions! Going to try all as soon as I get home from work, will update. Would be so good to not have to get plumber out if it’s not necessary.