Leaking single storey pitch roof , conflicting repair options

13 Jun 2014
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United Kingdom
Have a single storey extension with concrete roof tiles. How we have a leak at the lower end of the pitch on the inside . On further inspection it looks like it is an old leak ( only moved into place a few months ago) as from the staining that as appeared and looks like someone drilled an inspection hole .

Had four roofers round.
No1 . looked at roof and inside damage and said felt failed . Described work as remove 4 rows and refelt and add new batons. Depends on what is found maybe rest of felt this was said without moving any tiles , just getting on a step ladder.
Verbal quote 1k and then depends on findings, have asked for written quote .

The other three said pitch of roof is not enough. two of them moved tiles and showed the soaking felt and batons and these both said best bet would be to replace with a flat felt roof , due to pitch.
No2 send quote at 3.5k, 12 years guarantee
No3 said no tile will work on this pitch they were the only ones that measured the angle by placing a baton on the tiles and measured at around 10-11‘ , Waiting on quote.

No4 said he would fit low pitch tiles as the ones fitted are not and said he done similar before. Quote is at 5.6k. 10 years guarantee.
Any opinions would be great as not sure which would be best or right or wrong , area size is around 23-24sqm measured internally, . I know flat roofs have come along way.
would value of house be greatly affected ?
are there tiles that can work with a low pitch?

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What is the pitch exactly? Can't really work out the length exactly from the pics, a better pic of the side would help. Looks to be about 12deg but as mentioned needs measuring really, we just need the horizontal length and height.
Thanks . See side pic. Measure the side length 4m from end of bricks to the main house then 20cm soffits
height at main house 3.26m and lower 2.55m that’s to the underside of the tiles . If I calculated that correct it is less than 10 degrees.
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