rainwater coming from inside above the windows in the kitchen

maya74

I bought a property in August 2018. A month ago, so far twice during heavy rain and wind, the water started to leak above the kitchen window. There is a small gap between the window and the wall and water is coming through there. I marked this with yellow on the pictures 05 and 06. At first, I thought that I needed to replace the windows and fill the small gaps with a sealant so I called a designer to give me a quote. After he inspected the kitchen and the window from inside and outside he told me that there is nothing wrong with the window itself, but that water is coming from the outside wall somewhere from above. The roof is inspected and there are no leaks in the property above mine. As can be seen on the kitchen ceiling, there is no damp or leak. There were also no damps or leaks previously in the kitchen (see pictures 01 and 02 from 2015 and 04 from 2018). The previous owner has done some work on the outside above the kitchen window (see picture 03 from 2015). I am wondering whatever has been done back then could be botched work and what could be an issue? Lintel, cavity tray? I have no idea how to approach a problem. Should I call a local bricklayer or construction company? What they should repair? Lintel, cavity tray, or should they re-roughcast externally to weatherproof the exterior walls? Overall, the apartment is in very good condition, with no leaks on other windows and no sign of damp. In the beginning, I foolishly believed that I can fix the issue on my own with a little bit of sealant, but I will need an expert. Any help is more than welcome.
IMPORTANT EDIT TO THE POST
I have noticed that the window is not properly sealed from the outside. I was wondering could this be the initial problem? Is it a good idea to seal it with Geocel TheWorks which is an all-purpose sealer and adhesive and afterward paint the outside window walls with water-repellant paint? If this fails, should I check for the faults in the cavity tray?

maya74

I was trying to post the pictures, but I am not allowed to as I am a new user.

bob_a_builder

you can upload the pics to something like
https://imgbb.com/
The put the links that provides into your post here

maya74

I have tried this just now, but I am not allowed to post with links either, at the moment.
Is it possible that water is coming through the joints in between new and old render? The old and new render are above window. Should I re-render?

savemoney

Just break the url up OP https://imgbb.com/ image1.jpg. it could be that you need sealant between window and brick work easy job to do yourself.

maya74

https: // ibb.co / pLpP8vB
Thanks. I was talking about this. Should I just re-render?
And these are other pictures of properties. The ceiling in the kitchen and the walls inside are dry. No wet patches. The water is dripping inside the kitchen where the window meets the wall.
https: // ibb.co / DW9nv0f
https: // ibb.co / JnhdkKR
https: // ibb.co / XzfSMpG
https: // ibb.co / DzBxBrz
https: // ibb.co / H75mSXV
https: // ibb.co / pJRRkN2
https: // ibb.co / sPD0pY0
https: // ibb.co / C8TL3TC

stuart45

Do you know the construction of your walls? eg solid, cavity, filled cavity?

maya74

Brick cavity construction, roughcast externally.

stuart45

Could be there isn't a tray in the wall above the window.

maya74

How should I find out? Is this a standard building element? Do you think that the cavity tray is faulty or that the tray does not exsist? Should I call the bricklayer to check? Is it worth to re-render the patch in the case there is a leak through new and old render? And if this fails to check for the cavity tray?

stuart45

Trays are a standard item in a cavity wall, unless something like a Catnic lintel is used which has it's own tray. Yours looks like a new lintel was installed, so it may be a concrete one without a tray.
Roughcast walls don't usually allow a lot of water through the walls, although cracks can let some in.
Water can also get into the cavity if the eaves felt has gone.