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    Damp garage - tanking query

    Have you got guttering the garage roof on the boundary? If you do, where does this drain to?
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    Cavity wall air vent

    It'll probably be fine now. You could uus expanding foam to fill the gap. Damp it first with some spray water.
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    Ventilation gap behind external cladding on timber frame extension.

    Normally soffits go on after. If you're worried about ventilation then drill some holes.
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    Is this acceptable to building control?

    Some joist hangers or nail plates would not go amiss.
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    Best blocks to use? Low "wall"

    Save some bother and it in timber? If you want it rendered you could do cement board and render this otherwise clad it.
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    Do I extend or not

    Most but definitely not all, you get lots of hand drawn plans both for planning and building regs.
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    UHF new screed drying time

    1day per mm if it's standard sand and cement. UFH can be run at about halfway through to speed up drying but only run at low temperatures.
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    Do I extend or not

    Do you really want a toilet off you living room? You're going to end up with a really dark space.
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    What counts towards home energy efficiency?

    RdSAP (reduced data SAP (standard assessment procedure)) was introduced for 2 reasons, to make people more aware of the energy efficiency of their homes and to get a cheap survey of all the housing stock in the UK. When a new house is designed it undergoes a full SAP which will detail relevant...
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    Fixing wall plate to steel.

    Why do you need to fix it down?
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    Underfloor ventilation conundrum

    Sticks a solid concrete floor in and be done with it, it may cost you a couple of extra Ks now but it will give you peace of mind and probably save you money on hard scaping later. Having a concrete pond at the bottom of a hill is asking for problems. If your levels are drastic use EPS to keep...
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    Underfloor ventilation conundrum

    You are glazed on all sides? Sounds very architectural so why has this not been solved in design?
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    Large hole in concrete floor under sink unit, advice please

    Alkathene :D There will be cast iron before you get to the copper pipe, the copper will last much longer than iron. I would not worry about the copper pipe, i've still see it and it's still going strong. The copper pipe back then was nice and thick.
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    catnic, double rsjs or concrete lintels.

    Glad we got this one sorted.
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    Which heating system to use in this kind of extension?

    My suggestion would be to listen to the others and either use wet uf or rads. However it's your house, you sound like you've made your mind up, so go for electric under floor. Then in a year put some radiators in.
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    Thickness of plasterboard for overboarding ceiling?

    Cellotex is not wood fiber. More likely hard board or MDF. This might indicate a bad DIY or boddged job else where. Just over board and skim.
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    Cavity tray for extra wide wall

    Stick some dpc along with the cavity tray, so your tray only covers the first outerskin then the dpc would sit under this and over the outer skin.
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    Cavity tray for extra wide wall

    Stick a bit of dpc in.
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    Best way of dealing with a long step within 150mm of DPC

    Your step will be sloped away from your house. If the area floods i would put a drain in front of th steps, a long Arco style one and get a larger door canopy.
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    Kitchen Extension Prices

    Internal works maybe around £500/m² extension 2000/m²
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