Neighbours new dormer on shared wall

[ayse84]

Neighbours have told us they will build a loft conversion and the builder wants to remove the shared chimney stack and if we object. As we will be removing the chimney breasts some time later we didn't object.
They have now started building the loft and I'm concerned about how close it is to the ridge line. The cheek without the tiles and finished roof is touching the side of the ridge tiles. They have now removed the entire ridge tiles and some tiles on my side. This makes me think they will be building the rafters, tiles and roof on the boundary line.
I've raised this with the builder and he has assured me that it will not cross their boundary ( I presume it refers to half of the ridge).
I'm not thinking to do a similar conversion yet but may do in the future. My main concern is whether this is encroachment or not? I don't want to disadvantage my property or it's sellability in the future.

I asked the builder how I would tile the side of my dormer in the future and he said that it's done via hung tile method ( I don't know what this).also I feel he is just lying.

 

[Murdochcat]

Is there a party wall agreement in place?

 

[ayse84]

No party wall.

 

[Murdochcat]

No party wall.

You need to tell them to stop the work and get the agreement organised

 

[ayse84]

I have very good relations with the neighbours and don't want to stop their work if not detrimental to me.
As long as they don't encroach and it doesn't in any way disadvantage my property.
Based on what I've described will this be encroaching if they building on their side of the party wall?

 

[^woody^]

The ridge has got nothing to do with the property boundary.

What matters is where the side dormer cheek is located, and if it's built on the line of the party wall then a party wall agreement should be in place. And as part of that agreement, it would be determined how this wall is built to allow you to build a similar wall in the future.

As it is now, you won't be able to tile any dormer wall you plan to build against the neighbour's wall.

 

[wessex101]

If the line of the rainwater downpipe and change in pebbledash render is indicative of the centre of the party wall it looks like the dormer cheek, even with tile hanging will be well inside the neighbour's own boundary so it doesn't look like there will be any encroachment. Ultimately you will not know unless you take measurements of the dormer in relation to the party wall.
If you are considering adding your own rear dormer it would have made more sense to build up off the party wall so both you and the neighbour could have shared the same wall. It will be quite tricky to butt a dormer right up against the neighbours, doable but awkward.
@woody If you look at photo 1 it looks like there was a line of ridge tiles running down the rear roof slope, probably to cover a change in roof tiles? I think that may be the confusing reference to the ridge tiles in OP's original post?

 

[ayse84]

So this is how it looks at the moment. I thought they would replace the tiles they took off but apparently it's broken and they don't do the same one at local merchants. He said these are the closest reclaimed tiles he could find but I have looked and you can get the exact same as mine. He would need to drive about 30 minutes to source them. Would I be unreasonable to expect him to place the same ones back?

 

[johnny2007]

The tiles will weather with time and look same as the others.
They need to do something about your ridge tiles, they don't seem to be fixed.
Personally I would prefer my neighbour to build on the boundary line with an agreement that a future dormer conversion would attach to theirs so to make it look like one whole structure and avoid rubbish collecting in the gap between dormers.

 

[^woody^]

It looks a tidy job. I would be more concerned about the ridge tiles than the new tiles colour