DevilDamo

You are creating 3 new houses so you pay for 3. Otherwise those people who are knocking down one house to replace with another wouldn’t have to pay a fee.

I was initially comparing your figures to mine… both using a dead load of 0.75 and that is what/why I said they were different.

Incorrect dead load. You need to take the middle section of each table.

It is now the responsibility of dutyholders, especially Principal Designers. I am sure you will still find the odd RBI giving such advice but they shouldn’t be.

Not a link but I have them saved. None of the C16 tables justify a 4.7m clear span with 47x220mm @ 400c/c

Yes, but play it safe using C24’s and not C16’s. Is it being constructed with masonry walls?

Quite concerning how different the tables you’ve referred to differ to the standard Trada tables as the latter don’t confirm your size.

No, you would need to install 47 x 220mm C24’s at 400mm c/c. What are the walls constructed of? What is the overall height snd how close to a boundary are you?

A soakaway wouldn’t work anyway.

That would not trigger BR’s. As it’ll be over 15sq.m, it would depend upon how it’s constructed.

Not now an option since 1st October.

I’m thinking more along the lines of the different thermal characteristics, warranty, etc… PIR is more common for thermal resistance while quilt is more common for sound resistance. Unless you’re insulating at ceiling level and Rockwool (or similar) is usually the common “go to” product.

Did the Architect actually carry out the surveys or were they done via a third party? If the latter, approach them to have them re-issued.

Yes but I would stick with the same manufacturer or at least PIR boards. Edit: And btw, I am initially referring to the flat roof.

Correct, warm roofs do not require venting. You’d have to carry out a u-value calculation but as an example, 150mm of Celotex on top achieves 0.15.

You’d be better going in for Planning.

And a ventilation path at the parapet and wall abutment? A warm roof would seem to be a lot more logical in this situation.

How/where did you fit that in?

I can’t see any issue in raising it, providing it doesn’t raise above the level of insulation. It looks like you’re going for a cold roof and if so, what are ventilation details at the parapet, rooflight upstands and wall abutment? What is that beam being supported on as I assume you have or require some kind of goalpost frame?

The OP was talking about having 2 or 3 steps down and taking into account the floor make-up, that is already going to be a reduction of at least 600mm. Should the OP decide to submit a LDC, then I’d be quite surprised if the LPA were going to ignore the engineering operations.

https://www.gov.uk/guidance/when-is-permission-required https://www.planningresource.co.uk/article/1209004/operational-development-q---dcp-section-431

It’s 2.5m and only when within 2m of a boundary. People would have to be careful if they are start reducing levels in order to provide more height as you start getting into the realms of an engineering operation, which would require Planning.

No more free go’s whatsoever now, irrespective of the type of application.

Apart from the cost of a Planning Consultant.

@jeli Let them formally determine it. You can then challenge the decision via an Appeal. You cannot Appeal a withdrawal. At the same time of submitting the Appeal, submit another Planning application to the LPA for something that is likely to be more favoured.