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DIY Two Storey Extension

Discussion in 'Your Projects' started by acurachris, 8 May 2019.

  1. acurachris

    acurachris

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    Yes, that's where I made the biggest cost blunder! It cost me £2000 to get rid of the garage (£2000 to de-value my house!). The man with digger and three grab trucks cost £2200, then £4800 for the pilings and concrete! None of which anyone will see!

    Wow! Has he not been using grab trucks, a lot more cost efficient for the general dig as I'm sure you'd agree!

    I've got the wife who often comes out to inspect, although she only says, "is that all you've done"! :LOL:
     
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  3. cdbe

    cdbe

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    We have a council owned flagged verge between us and the road so access is a problem and the drives are narrow. I only got the lorry up because I have a widened drive and I was prepared to put my fingers in my ears as all the council's flags snapped in half!
     
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  4. Rott

    Rott

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    Can you brake down how much was the pilling, and the concrete? How many cubic meters you got in?
     
  5. cwhaley

    cwhaley

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    In awe... inspirational stuff! Our ground is full of bricks, old milk bottles, bones, concrete but yours' really is next level.

    So difficult to sit down and cost something like this on your own so hope the costs start to stay steady. Looking great so far.
     
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  6. acurachris

    acurachris

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    The company gave me a quote based on sending the piles down to 4m and then mine was £20 per pile per metre after that. I think three piles went to about 6m, the others were within the 4m.

    They quoted the concrete in metres based on the concrete pour being 450mm width x 350mm depth and mine was for 21m length. They quoted £60 (inc vat) per metre for this so £1260 for the concrete. About the same for the re-inforced cages that ran the length of the trenches. The piles were about £1200, some site setup costs, engineer drawings etc... here was my quote ex vat.

    Piling Quote PNG.png
     
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  7. Notch7

    Notch7

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    Thats a good price for the piling.
     
  8. acurachris

    acurachris

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    I thought so at the time, all we had to do was excavate the trenches. We are North West too, not sure if that makes a difference!
     
  9. Notch7

    Notch7

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    Well I did a piling job in Sussex for a 6m x 6m extension. The driven piles plus filling the tubes in concrete and leaving rebar poking out cost £5k +vat. (Quotes ranged £4k to £9k).

    The cost to do the reinforcing metalwork and cast the concrete ringbeam was about another £4k.

    Pricing is significantly higher in this area (Sussex, Surrey, Kent).
     
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  11. scaffers

    scaffers

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    Great stuff m8
     
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  12. Johnkmac

    Johnkmac

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    Hello,
    im a first time poster (long term lurker) but the beam lintel through the original extension looks extremely ropey to me. Its not sitting on enough of a bearing length on the top course of bricks and then because of the brick bond underneath where there are 1/4 or 1/5th bricks where the brickwork was cut out. Its then sheared through at least one of the full bricks (3 courses down).

    You can see the beam has consequently dropped on the left hand side, hence the cracking in the brickwork on top of the lintel.

    It really doesnt look to clever at all. Could only recommend getting in a structural engineer and get a good few acrow props under it for the time being.
     
  13. jonbey

    jonbey

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    Nice work.
     
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  14. acurachris

    acurachris

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    Hi

    Yep, it was noticed when I took the old extension down. The movement has been like that a while from what i understand (I believe the extension was done in the late 1980's. I have had a structural engineer visit and confirm the lintel is adequate to take the weight of the new extension floor, and that the bearing was okay (although they didn't see the side you're seeing now as it wasn't exposed). When I removed the plasterboard from the wall this is what i found...

    thumb_IMG_7553_1024.jpg thumb_IMG_7556_1024.jpg thumb_IMG_7563_1024.jpg

    I'm going to prop the lintel and rebuild the bearing wall as I have to cut the wall end to open the cavity for the new extension.
     
  15. pilsbury

    pilsbury

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    Bloody brilliant. I think your brickwork looks great. This takes me back. Need to build something.

    Keep up the sterling work and keep posting pics.
     
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  16. acurachris

    acurachris

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    Rebuild Lintel Bearing Wall

    I had to prop the already in-situ lintels with props and then remove the "rubble/makeshift wall".

    thumb_IMG_7563_1024.jpg

    Most of the wall under lintel pulled away without much effort.

    thumb_IMG_7566_1024.jpg

    Started building that side of the wall.

    thumb_IMG_7575_1024.jpg

    Built the block wall under the lintels and then the new extension block wall. I installed a concrete lintel under the lintels and packed any gaps with slate.

    thumb_IMG_7593_1024.jpg

    The extension wall built and joined up with a lintel to the rest of the extension.

    thumb_IMG_7634_1024.jpg
     

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  17. acurachris

    acurachris

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    Installing the floor joists

    I had to find the level of the existing house floor which was perhaps easier due to the already installed lintels which support the current first floor. Even so, I drilled the first hole on the far right to try and see the existing joists. From this I could ensure where the floor level was.

    The joists were 400mm centres so I marked out the positions on the existing house wall and stitched drilled the holes, then used an SDS drill and hammer and chisel to out the holes; thirteen in total. I had to make good a few bricks that had crumbled when making the holes.

    IMG_7672.jpg

    I decided to treat the joists before installing them into the walls.

    IMG_7685.jpg

    I mortared the gaps around the joists.

    IMG_7720.jpg

    I installed noggins at the midway point across the floor and herringbone straps at 1/3 and 2/3 positions using a string line to ensure they were in line. Lateral restraint straps were also installed at 1/3, 1/2 and 2/3 positions; perhaps a little overkill!

    IMG_7699.jpg

    Joists from above.

    IMG_7701.jpg

    Chipboard floor laid and covered with DPM sheeting to keep the rain off. Of course it lashed down for about two weeks after this! :rolleyes:

    IMG_7782.jpg

    Block work going a little higher.

    IMG_7803.jpg
     

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    Last edited: 23 Jun 2019
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