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Thanks for your help Richard. If it was vented to outside above the en-suite would it still need a separate stack? Tony

Visualise this if you can! Downstairs toilet below new en-suite. Downstairs wc exits horizontally into elbow then into floor. Is there a connector available that can replace the existing elbow allowing an additional side access for connecting the upstairs wc. Much appreciated Tony

There was a conservatory there but it subsided a bit and had to come down. There is a pond quite close (top left). Piling was cost effective. There isn't one! It has to go under the insulation.

Me too!

This may be of interest: http://www.flickr.com/photos/36349455@N00/sets/72157622499666169/show/

That was what I thought. But, I'm looking for a really persuasive argument if the Building Regs guy mentions it.

My extension will have a lean to roof to the house exterior wall. The house wall is block, rendered and painted. Do I need to retro-fit a cavity tray into the house wall above the lean to? Much appreciated, Tony

In practice, would the DPM be trapped between the blocks as shown?

Am I allowed to do this: DPC shown red. Much appreciated Tony

http://www.planningportal.gov.uk/england/genpub/en/1115316438436.html

I'm not sure I've got my head around this U-value thing yet. But would I be right in thinking that 125mm polystyrene is U 0.32 ? My thinking: if Polystyrene 50mm = U 0.8 then polystyrene 25mm = U 1.6 so for 125mm (5 x 25mm) 5 x 1/1.6 = R 1/R = 0.32 But I thought the floor...

My extension will have a floating chipboard floor over solid insulation over concrete. In order for the bricks to course up, I have a depth of 150mm for the insulation and the chipboard. Could I save money by using a thinnish phenolic layer and a polystyrene layer? Anyone know where I can find...

I've seen that kind of thing down here in Cornwall, and if you've got a good view from it, it must be fantastic! I'd be careful not to use a Victorian or Georgian style plastic roof though. I think it makes a big statement and it's got to be architectural rather than "Wickes". I'm pretty sure...

Thanks chaps. Some really useful points there. It was looking like I might need to buy a few additional "perfect" bricks to make up the numbers, so thanks for mentioning the gable end. Tony

I'm building a smallish single story extension. I local merchant specialises in end of line and second quality bricks. We saw a suitable brick there, but was told it was a second - so there would be extra variation on colour and size. They are 32p each instead of 42p. Would I be silly to buy...

What is presently regarded as the most cost effective brick/cavity/block wall in terms of which insulation and what type of block to use? Much appreciated Tony

I want to build a single room extension. Due to the ground conditions it needs to be on piles. I reckon it would be cost effective to cast the floor and edge beam in one go as a reinforced slab. However, this would not have a damp proof course because of the piles. I figured I could do a...

So, that's quite a lot more expensive than what the american sites call "stick frame"?

Please could someone give me an indication of cost per square metre? Also, are they used for the floor in the UK and what will they span unsupported? Thanks Tony

You're absolutely right. But then the lintels, piers and pads all have to be much bigger. Floors like this are quite common aren't they?