Dave Jones

in that case you have an airflow problem, can air circulate under the ridge or is it blocked off with a ridge beam ? Some tile vents at the top can help to create a draft over it.

my money is on trees being the issue as even 1.5m would be overkill on clay in the absence of trees, piling would be cheaper.

you can do without BR drawings but you have to know what your doing to anticipate issues. For self builders its too much of a risk as you will have umpteen other problems due to lack of knowledge and experience so anything that reduces the risk and unforeseen costs the better. You wont feel confident enough to push back on some of the more extreme nonesense BC will try to push on you thats costs £££ where as a builder will as he knows the score.

remember its not sweating the dew layer is being pulled inside the insulation. You have a cold roof so make sure there is a LOT of ventilation all over the roof, open eaves or vented fascia and open ridge (dry).

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it may help you to run a string line to get the edge straight, also work out the cut at the end first as it looks better with an equal cut at both ends.

min £1500m2 for basic, complicated and nice fittings more like £2000m2. Best bet is to get your plans drawn up and have them QS'd then you will know to the penny what it will cost, its cheap to do as well. https://www.estimators-online.com/

it will be the completion cert that triggers the tax droids. Delay that as long as possible....

think id be inclined to tuck it under the neighbouring tiles to make a smart job if it similar to whats been posted above.

maybe a case for helicoil screw piles. wont save you much cost wise but speed and mess wise they are a breeze. Find a good local builder and ask them what SE they use. Yours might be one of the un-better ones.

what ventilation do you have above that ? Needs to be open at eaves and ridge.

looks really good, shame about the render though. A nice brick with a plinth would have looked stunning.

pretty poor finish really, no attempt at doing the corners properly. Accrediuted EDPM installers can offer firestone backed 10 year warranty, id insist on it before paying. What is the build up of the roof, what vapour barrier was used ?

not like you wanted it laid to a fall ......

they are carbon neutral. Much better than a gas or electric fire.

minefield of regs, whoever you are getting to sign it off needs to spec it.

block it with blocks.

block up the blacony opening ?

you have built too close to next door ?

yup this, will look fine.

cheapest planings, if they are screened are very good compact down well. otherwise type1. Make sure you have a slight camber so water runs off and doesnt sit or pool.

timber the glass areas to get your completion cert ?

check the beam drawing it will specify where the vents are to go.

i can see weather happening completely normal. You have proof for your end of the world doom ?

bolt some collars on them.