DevilDamo

In having a main contractor, you would let them take care of the whole process and ordering. They may in the first instance allow a provisional sum for those items and provide you with their recommended or suggested suppliers.

It varies… office or home based. I haven’t come across any of my PO’s that will not visit their sites prior to putting forward their recommendation.

Based as in where they live?

It differs. Refer to your Highway Authority’s requirements.

You will find plenty here… https://visqueen.com/technical-downloads/#detail-library

Without an assessment and if the OP decides to commence works, then they will be in breach of the Planning approval. Simple. The OP could decide to vary or remove the condition, but would need to provide the LPA with sufficient evidence to back it up. An assessment can be carried out and it may prove there is little to no risk, then happy days. The LPA would not have included the condition if they didn’t have some information to back it up. All pre-commencement conditions are (should be) discussed with the applicant and/or agent prior to being included and issued. It would have been at that time for the applicant and/or agent to query the requirement with the LPA. Without a suitable site investigation and/or contamination report, the OP may struggle to take out any new build warranty on the new dwelling. Even more crucial when trying to borrow money or secure a mortgage against it. A warranty provider (i.e. NHBC) will request a complete radon protection if there is no site investigation and/or contamination report. This will also include barrier pipe.

That is why the Planning condition is there, to assess the site for any potential. If the assessment deems there is no risk, then that will save the OP a lot of money on the build cost.

Refer to ADK… https://assets.publishing.service.gov.uk/media/60d5bdcde90e07716f516cfd/Approved_Document_K.pdf Attached is a compliant example, albeit a very different staircase design.

That is not down to the BCO, but the principle designer.

If in doubt, ask (the engineer to provide you with a detail).

Maybe to you but not in these current days of biodiversity and ecological enhancements. Look on the LPA’s website for other similar schemes so you will get an idea as to the level of detail required.

What jurisdiction does the BCO have over a Planning condition?

If it does not specially state ordnance datum levels, then set your own starting with 10.000m for example.

Which would have different requirements than a single storey (bungalow) dwelling. The number of storeys dictate the means of escape requirements.

Is yours a single, two or three storey dwelling?