Water ingress through top of 4 window frames

[mh224]

I live in an old stone house (built 1830s) with an extension built in 1970s.
Front of house (facing south) has 4 downstairs wooden sash windows, 2 in the original house and 2 in the extension.

During recent storms I've had significant amounts of water coming through the top frame of each of these windows.

The front of the original house has a 2-inch thick cement render and painted. There are some cracks in the render (1/8" or so) that have previously been filled.
The extension is cement rendered and painted. There is a crack above and to the side of one window.

I've raked out the cracks and filled with polyurethane sealant but it made no difference.
I've confirmed that gutters and downpipes are clear and holding water.
No water comes through upstairs window frames.

House was decorated outside 4 years ago with Dulux Weathershield on walls. I can see some bubbling of that paint on the extension, so wall is clearly wet.

I'm now stuck (and worried, given the weather forecast).

I'm thinking I should engage a specialist surveyor to advise on treatment.

What do you think?

Any ideas of anything I could do as a temporary measure?

Thanks
Martin

 

[catlad]

A few pictures will help with replies what type of gutters do you have? are they the type that straddle the cavity?

 

[mh224]

I've confirmed that gutters and downpipes are clear and holding water.

Hi, just to close this off. I managed to get a ladder up during the storm last week and found the gutters completely full and overflowing . I've now cleared them properly and things seem to be OK, although I'm planning to replace them anyway.

Quite a lot of redecorating required, and there may well be further damage.