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@cdbe - a really great post which is very helpful in getting me thinking. I like the idea of the high level purlins. Also a good idea of sistering the existing rafters to help with support and insulation. Not sure how I’d implement if I were to be keeping the existing purlins in the rest of...

“To accomplish much, you must first loose everything” Some on the internet miss the irony and take things literally. I did not miss this, but Woody’s quip has got me thinking. Dangerous I know, but after a fruitless afternoon of trawling the internet for a simple loft structure designer, I’m...

From these inspirational words, I’m taking that I should say balls to the designer or engineer, go full bore ahead with my own crackpot plan, possibly loose the roof and back part of the house, but then rebuild the lot and then sit back in wonder at my accomplishment? there or there about?

Guessing and cobbling together is a forte of mine. But I do take your point and think I will go down a basic route of getting a professional to design the floor and dormer. 2 main reasons… firstly I don’t know what I’m doing, but more importantly I think building control are going to want to...

Ah, I see…. So by positioning a mere 4x2 (pole plate) right near the wall plate but only sitting on the ceiling ties, there will be virtually no deflection in the ceiling ties as I’m right at the edge of the span. Correct? I suppose I could then add further pole plates on the ceiling ties mid...

I’m not going to be demonstrating my ability here to inspire confidence in me pulling this off…. ceiling ties?? Is this what your calling the loft floor joists? Because they stop the roof spreading? pole plate?

You got any recommendations Woody? You’re West Mids based too. I think I’m only after the structural supporting side of things. Remember, I’m pretty much expert on this at present…. I’ve watched 4 YouTube videos.

Some of my novice previous questions on this subject may have you thinking I need more than a structural engineer, but hear me out! It’s been a couple of years since I finished the extension which is still standing so I’m itching for a new monster DIY project. I’ve built out, so now it’s time...

I think the term professional applies strictly to being paid to do something. I do stuff myself taking far longer than a “professional”, but I care because it’s my property. Many professionals don’t care. In and out.

But if you were digging it out, you could relay it at a lower level. Say a 1 inch step up to save water ingress. No need to relay to the highest point.

I’d be thinking about digging up as suggested. If it’s just going to be a workshop I’d not bother with insulation. Just a DPM and new level concrete. I’m not sure there is a requirement for a certain slope on a garage floor.

Cheers Woodie. So with my large open rafter overhang I can pretty much build off the existing house wall I’m guessing.

I think I’ve not explained myself properly. I have a gable one end and a hip the other. I will be leaving both as they are. Just loft converting. So the dormer will be well under 50m3

I’ve not got the foggiest idea! I just thought it was. it’s a classic 1920-30 roof. Rafters, purlin jobbie. I thought that when you add a dormer and cut out one side, it messes up the balance of the roof (front and back pressing against each other) so the new steel ridge beam supports the front...

Not hip to gable conversion……keeping the hip. Just adding a dormer. The dormer would run from the right hand chimney (looking at the back) to the gable over the bedroom. I do take your point about looks. A big consideration.

Early days planning - will be getting a structural engineer involved for calcs and beam placements on my DIY conversion, but am perplexed about what can be done with my roof. Of course I know they will know a solution, but I always like to have an idea myself to avoid any daft suggestions from...

Still mulling over a DIY loft conversion. Getting my head round the idea. So PD states, no more than 50m cube of space added and dorma must be set 200mm back from eaves. So where exactly are the eaves? The bit of facia the gutter is attached to? The wall of the house? Every picture I’ve seen...

Cheers. Basically 120-125mm total then.

Mulling over the possibility of doing a loft conversion. Very early days and probably not till next spring. House built in 1925 with a plain tile roof in good condition. A dormer will be on the back, but I was wondering if I can simply put the required amount of PIR in between the rafters from...

Me and a mate would have done that in flip flops. Maybe fashioned some temporary supports out of roofing lath (cheaper than 4x2)