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Should be 60 - 150 clearance at the top to tile/ridge tile, top side fittings look as if they are not located correctly, installation looks a bit bodgy. Suggest you call Velux customer support and ask their opinion

Cl 2C6 of Approved Document A gives guidance on this

If you actually did the calc for a c16 47 x 54 joist it shows that it fails strength wise by 5% and deflection wise by 35%, shear wise its OK by 50%. Obviously the fact that its still 102mm deep in the majority of the joist suggests that strength and deflection would not be an issue. The only...

Why not just provide the pictures and let them decide and if it goes against you use Woody's PD card

Loading on lintel will be less than 2kn so a 65mm lintel more than enough.

never mind the width whats the depth

He must have closed for the bank holiday, tried ringing him to book a draindown in the Outer Hebrides but unfortunately phone is switched off

"The chance of anything going wrong is pretty small but the bolts being at an angle does increase the risk of a failure" Why? The area of the bolt at the joist/brick interface is if anything increased so shear failure is increased and as long as the bolt heads are tight against the joist there...

No. The weight is already shared by the full length joists by virtue of the floorboards crossing at 90 degrees

Unfortunately as far as I'm aware there isn't any data put forth anywhere as to the safe tensile stress properties perpendicular to the grain of the timber so it would be quite interesting to see how the bending moment forces at the bolts/screws/nails or whatever, when resolved into the vertical...

You could always ask for his calcs regarding the joint and see what he comes back with other than "I've done it like this loads of times and never had a problem". Blind him with science, the max bending moment at the centre of the beam based on standard floor loadings and say 500mm joist...

A lighter read https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwiugvat29zvAhU3hf0HHY6gClQQFjABegQIAhAD&url=https%3A%2F%2Fwww.tfguild.org%2Ftimber-frame-engineering-council%2Ftechnical-bulletins%2Fview%2F163%2Fdownload&usg=AOvVaw0ONEK2LIX28THHN-xtJ6mp

That is not structurally sound, joining joists together when they are destined to take/transfer bending moments is not a standard practice , a longer joist being the best option and certainly is not something a builder is capable of designing. Here's a little light reading but if its to heavy...

UDL for that size lintel about 3.9kN/m, looks as if lintel is only supporting triangular brickwork load above it giving less than 2kN/m run loading so could well be

Thats one hell of an extension

My mum use to say that a lot but in "thats why" format

Approved Document A will give you some guidance on foundation depth/widths