Mr Punter

I have used Guttercrest. Very good quality. Lindab is also good but only plated steel.

The planning consultant could be a good call. I have, in the past, instructed architects to design a scheme that did not gain planning consent, so quite a waste of time and money. I would favour shortlisting a couple of architects and asking each to produce a sketch scheme for an agreed fee based on your brief and input from a planning consultant.

Can you please use stainless screws?

So really all normal 2 storey buildings? Typically outside ground level = 0.00, Ground floor FFL = 0.15, Ground floor ceiling = 2.55, First floor FFL = 2.85, First floor ceiling = 5.25. I think you may have misinterpreted the guidance.

No, system boiler and UVC. Viessmann modulate down to 3.2kW and cost less than £900+VAT. One stat and TRVs.

Yes, it looks like it has washed off. A bit silly rendering in the rain.

A bit off topic, but I know of no instance where a domestic dwelling in the UK ever suffered structural failure via steel losing strength in a fire.

So the first house you build is a spec development. Buyers will not be very interested in the heating system, EPC score or airtightness, just location, what it looks like, number of bedrooms and price. People are used to gas boiler and rads, so unless ASHP and UFH are cheaper, think twice. You will need a design stage SAP NOW! This will inform the minimum level insulation, heating system, hot water and airtightness needed for you to get Building Regs. Do it for as little money as possible.

Perhaps a flat entrance door would work. It could also be Secured By Design.

Agreed but they are wanting to pull his pants down. The elevations look simple enough. No magic needed and it is well within the skills of any decent bricklayer.

I would be concerned if the steel won't hold up a standard med dense block within the allowed limits. In addition to the mesh for the render, you could look at bed reinforcement for the blocks. Only use the 7.3N ones.

+1 Also look at any extensions going up. Merchants can often recommend, even if it is the guy in the yard or a lorry driver. Have a drive around and a chat. It shows you are not a time waster. Farmers often get brick and blockwork work done and they don't overpay.

Keep going with the quotes. What did your estimator base their price on?

I have followed the Graven Hill development over the years. I struggle to understand what it is about. Does not appear cheap or efficient to do, not very attractive, not cohesive, detached houses only and for all their individuality it looks quite soulless.

Agreed. They are trying to move in on @Pocster's turf.