DevilDamo

That may be the case for you, but not somebody who isn’t familiar with the processes and what is included for the monies being paid out. You wouldn’t accept a quote from a builder with a total cost and not have it broken down. So you should expect the same for a professional offering their services.

When was it determined, prior to 6th December?

Anything attached to the house would fall under Class A. Anything not attached to the house would fall under Class E. If you have PD rights and the proposal meets the PD requirements, then no issue. Which is expert at the show gave you advice relating to a temporary building?

That may not be your decision. Have you sought any kind of Pre-application advice from the LPA?

Yes. If they consider that not much of the existing structure remains, they may not accept the submission of a Householder application. So you’d have no choice but to submit a Full application. Different policies kick in with new build dwellings but as it’s a replacement so no net gain, that will help. You’d then also need to meet the Building Regulations for a new dwelling so would require to provide additional reports and calculations.

Your LPA may determine this as a Full and not a Householder application. Best to get some advice on that.

That isn’t an extension. It’s a new build dwelling.

Yes, but would not apply in the OP's case.

@kandgmitchell It isn't dis-similar to a current BCO picking me up on a wording on a drawing. It related to the depth of foundations and that the depth is subject to BCO inspection and approval. The BCO asked me to change the note, otherwise he wouldn't approve it. His comments stated... Following the October 2023 changes to the Regulations and subsequent guidance issued to BCBs around “design advice”, we are not approving jobs with this wording. I can approve if a foundation design can be provided from a suitably qualified structural engineer, who has considered the site conditions. Alternatively I can conditionally approve, subject to such a design being provided. Our job on site is checking the contractor is following the design, rather than participating in the design on site. I understand this seems a subtle difference, but I won’t approve these plans with the phrase “agreed on site with building inspector”. So asking them what "they" would accept is no more and it's down to the client/contractor/designer to present a suitable deign for approval.

Not anymore.

But due to the change in BR’s, options would need to be presented to BC as opposed to BC saying what would pass.

There isn’t anything a consultant can do. It’s now in the hands of the LPA so you will just have to ride it out.

The last two conditions will require input from a consultant. You should be able to search the LPA website for examples of what has been prepared and submitted in the past.

The Family room would also need an openable window in order to with ADF (purge ventilation). Has the BCO not mentioned that in addition to fire escape?

To get the green bit, you’d need Planning and it would be a part single and part two storey side extension. Once you carry out that side extension, the remaining single storey part would require Planning as PD/PA does not allow you to connect to the side element.

I can’t see how they could go on the same application. The process and determining factors for PA applications is very different to that for LDC applications.

But the depth does not comply. So the roof design is irrelevant.

Lower the flat roof or introduce a pitched roof. Your Architect should be able to advise how to comply with PD. But going from your other post, the overall depth would fail to meet the PD requirements. Unless this is a different extension?

https://www.gov.uk/party-walls-building-works/reaching-agreement-with-neighbours

The eaves of the flat roof exceed the eaves of the main roof. Well they do in that drawing. I don’t know what other eaves there may be to relate or compare to.

That is a common detail/build-up for a warm flat roof. It would meet the max. 3m PD eaves height. Just as a side note and on that particular example, it looks to be a flat roof extension on a bungalow which are more difficult to get through PD. A different story when attaching to a two storey house.

Any application can be refused. Applications are determined on complying with policies and not start dates.

If the application was deemed valid upon submission, then the LPA would in theory lose 3 weeks their end. Should the LPA not be satisfied that the submission includes all the required information, the 8 weeks will start from when that has all been submitted.

As above, you can try. But don’t expect them to expedite the process just because you have realised you need Planning. In the nicest possible way, that isn’t their fault and there are processes to follow. It can take up to 8 weeks, even longer.

It also says “wherever possible”. There are ways to build close to the boundary without foundations, soffits or gutters overhanging. So if that can be proved to the LPA (where there are situations with less than 300mm), then that should be acceptable.