Extension advice - Where to start?

Thanks for this. So technically it could be a case of increasing the eaves height and having the pitch lower than 22degrees. This would be ok right? Quick Google suggests tiles are available that can be laid down to 12.5 potentially?

That is correct. However, anytime we've done an extension the tiles / slates where possible are matched in with the ones on the main house. Depending on what type they are, the manufacturers literature might not allow them to go as low as you want them
 
To my uneducated eyes, I'm reading the drawing that the steel within the pillar would be dimensions, but the presumably brick pillar surrounding it is much larger?

Haven't checked back for previous replies but from the photos above of what's already there surely just plasterboarding the column in would match the rest of the room once opened up would blend in better than a brick column built up around it?
 
Haven't checked back for previous replies but from the photos above of what's already there surely just plasterboarding the column in would match the rest of the room once opened up would blend in better than a brick column built up around it?

Maybe the dotted line is the 1000mm pad foundation?

I agree, it wouldn't look very good if it was brick :cry:
 
In all seriousness - what's the purpose of the extension?
It looks like you've made two(?) rooms slightly deeper and now there's a column breaking the open space and right in front of the big door, I really don't get a feeling of what problems this is solving in terms of how the spaces work or where light is coming in etc.
There's a big spend in all this, for me it doesn't look like anyone has considered the why, only the what
 
That column is stupid. As RSole says, really bad placement right in the middle like that.

either:

Move the pillar toward the kitchen and incorporate it into an island unit that end. You can easily calculate for a longer span over the living end. At least this way you can make a feature of the column and could even use it to box in an extractor or something for an island hob.

I’d also want to run the calcs for simply spanning the whole lot, even if the larger steels had to protrude through the flat ceiling. To me some boxing in on the ceiling would be far preferable to a column. Total span is only what, 6m? That isn’t huge..
 
I'd be starting to make friends with the local steel companies as your gonna be paying them some serious cash when this goes ahead :p
 
The motivation behind the extension is to create a bigger kitchen/living area that opens out directly on to the garden. It’s our main living space and we really want to make it open and airy. We had been looking at moving but like our location and felt the cost of an extension would be equal or less than the cost of moving into something that has what we want. If we can get everything opened up I’m hoping it will create a great space.

I agree the column would be better placed to the side but this leaves much larger pieces of steel on the one side (6-7m approx) which I was advised would be difficult to accomplish. Ofcourse, the desire originally was to not have a column but that was advised against from many many people I’d dealt with due to the size of the steel (approx 9m span) required.

Appreciate there’s a lot of steel involved. Would anyone be able to hazard a rough guess at potential cost now you can see what’s involved a bit more?

The proposed kitchen layout is as follows to give a bit more information. We could look at turning the island the opposite direction which could possibly then integrate the column? Or moving it along a bit. Not sure.

E2-D59-F88-D94-A-418-D-B0-B5-C054-DFD57918.png


I’m learning a lot as I go through this and do appreciate the feedback. I appreciate the extension may not be to everyone’s taste and perhaps may not seem ‘worth it’ to others, but we love our house and want to make this change (plus a few more) to make it what we would class as ‘perfect’ for us. I’m trying to take everything on board trust me!

I’ve been back in touch with the architect who didn’t see an issue with raising the eaves to accommodate what the SE has said.

Main things bugging me now are the tile issue and confirming whether the reduced pitch wouldn’t cause any issues there. And also the steel cost as I’m a little in the dark with that. I’ll ask the question to the SE about the column being moved.
 
The structural engineer should be able to give you a rough cost for the steel by the tonnage and current £/ton but I'm guessing north of £10k easily
 
The structural engineer should be able to give you a rough cost for the steel by the tonnage and current £/ton but I'm guessing north of £10k easily
Wow. Really didn't expect that. I've asked him if the column could be moved and asked him for a ballpark figure from his experience. See what he says.
 
I really think you need to almost reset here and go one of two ways.

You set an overall top end budget of X amount - Then look to see what you can get for that budget in terms of people/designs/finish etc
OR
You go with what you want/desire but need to understand that the costs will be way more than you think.
 
Definitely get a comparison cost between the two, in my experience the actual cost of the steel isn't that significant to the overall cost, there's usually a lot more in the temporary propping the work to put the steel in...
The additional cost of the post will be the foundation required to support it, ideally you could build off the existing foundation but I'd say it's unlikely to take the point loading, although you might be lucky...
I honestly think the post completely ruins it, to add 2m on to a space and have a post in the way really makes it not worthwhile for the expense - I know you didn't pay for a professional design, just a young guy to produce the drawings you asked for, but in all seriousness you could have covered the fees of a good designer to get the best solution with a real consideration of how that size of slapping works...(or whether there's a much better bang for buck solution)
 
Yes the logistics of delivery and installation needs to be considered. And as above there is a 1m x 1m x 600mm pad foundation required for the column.

Just one other thing to be mindful of. Your kitchen design appears to have a " straight" wall to the right (on plan). Then look at your structural drawings, the same wall "steps in" at the extension. You'll need to consider this in your kitchen design.

I have something similar in my kicthen but it's only 100mm and we have got round it more by luck than good judgement
 
Yeh sorry, they have built the return into the kitchen cupboards, the cupboards at the lower end would be pushed forward to line up with the cupboards at the top. Just means a bit of wasted space.
 
The structural engineer should be able to give you a rough cost for the steel by the tonnage and current £/ton but I'm guessing north of £10k easily
Wow. Really didn't expect that. I've asked him if the column could be moved and asked him for a ballpark figure from his experience. See what he says.
I'm a little confused to the point that i feel as though i must be looking at something differently to others here. Ive bought a fair few RSJs in my time, I wouldn't think that you will find the steel to cost anything like this :confused: My experience of steel is that it is not significantly expensive at all, leaving me thinking wtf. Definitely call a steel company or two and get a quote, as i think you'll be pleasantly surprised at how cheap steel is.
 
Steel prices have shot up recently. The steels specified look like standard sizes but they are large and there's four of them plus the columns.

They're going to need the joints / flanges fabricating, transporting, fitting (including temporary props) which is going to be labour intensive.

I was shocked at the cost to actually get a few steels installed in my extension. Admittedly it's cranked but still. I managed to to get ridge and hip beams replaced with timbers with a bit of change in the roof design, but for what they are the lumps of steel were surprisingly pricey !
 
As a structural engineer, I can confirm that material prices are rising by the day, and that's is it you're lucky to get supplies. Supply is really low atm and materials taking months to arrive due to a combination of covid, brexit and blocked canal. Prices atm include a premium upwards of 50pc if coming from abroad.
 
Yep, part of the reason I asked. We are part way through a decent sized extension now and had a few issues (nothing major) with steel, timber, roof battens and rosemary tiles so far....

Been first fixed and just been boarded out now. Kitchen order goes in next week (should have been this week but was an issue with the colours which luckily the builder spotted) so hopefully on the home straight. There are rumblings about the plasterers availablity though so not there just yet .....
 
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