How to get my builders to fix this...

But I will let you know, that the correct installation procedure with plain tiles does involve soakers. So I'll leave the rest to you.
 
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The bottom line is the builder needs to foot the bill for stopping the leak whatever that entails, and pumping gaps full of silicone isn't part of that.
It's hard to diagnose on here but a few errors have already been pointed out.
What's the pitch of the dormer roof and what tiles have they used, that roof looks flatter than 17.5 degrees which would be the minimum for most of those plain interlocking tiles. Also any idea how far back up the roof the back-flashing apron at the chimney abutment is
 
Can't remember the pitch off-hand but it's definitely shallower than 17.5°. No idea on the apron.

A local roofer is going to do an inspection and provide a written report. I'll ask about the tiles and apron, along with everything else that's been suggested. Then I plan to go back to the builder. Will let you know how it goes...
 
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If the builders have followed the designers design and specification, then it's not their fault.
 
The pitch is 12.5° and the tiles don't look suitable. Something about a 3.5" headlap? Is there a flat terracotta style tile that is suitable for this pitch?
 
If the builders have followed the designers design and specification, then it's not their fault.

The design states "Sloping roof: matching tiles on laths on counter laths on mineral felt on plywood on 125x50 spars at 400 cts felt torched to plywood to same spec as flat roof below shallow pitch to tiles. Tiles to be suitable for pitch."

Not sure what the flat roof bit means - copied and pasted from another design I imagine. But I guess my next step is to have the roofer report on whether the builder followed the plans or not.
 
Thanks for the replies so far. Just been up on the roof and taken some more photos...

View attachment 96956
What's to stop water ingress in pic one? Water runs down the roof and then under those slates...Once its under the tiles, it can get anywhere, can't it? .I'm not a builder so I am interested to know what should happen there.
 
Here are some more photos which are a bit more revealing... opinions please :)

photo 1.JPG photo 2.JPG photo 3.JPG photo 4.JPG photo 5.JPG
 
IMG_20160519_182613797.jpg
The architect has been for a look and suggested removing the chimney stack altogether. Looks like there was a problem with his drawings - on the front elevation view he's omitted to draw my half of the stack, so it looks like the dormer stops just before the chimney. He's hoping the builders will foot the bill to protect their reputation.

My neighbour won't agree to the stack being removed (can't blame her!) and besides, she has a gas fire on her side.

Edit: By the way, the roofers who've been think the builders have done a good job.
 
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Flashing or no flashing the chances are there will always be a damp issue.
As above incorporating the chimney was a bad idea.
The original construction didn't allow for this . Firstly the top of the stack needs rebuilding with a new tray.
The flashings are amateurish (C**P in fact)
Ask your guys to get the problem address by a specialist ..not jack of all trades.
And! steal their mastic gun..
 

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