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In short, you might - for full details visit this page.

This may have been the case in the past, but it isn't now. As long as there's a basin for people to wash their hands in before they return to the kitchen, it's allowed.

These are generally only permitted if you can't practically fit in a proper staircase. Losing space off a bedroom isn't normally sufficient justification. If you do use one, you will need to fit a handrail on each side. Check with your building inspector first. Also see this article.

If you or a previous owner carried out work without obtaining permission you may be able to apply to have this approved retrospectively in the form of a Regularisation (only possible for work carried out after 11 November 1985). For further information view "What happens if I didn’t make an application?" on this page.

If considering installing glass to as a balustrade or guard you'll need specialist advice on installing and fixing it in an existing home. You can find further information on handrails here.

You might need to apply for planning permission if it has a Tree Preservation Order (TPO) placed on it. If unsure, check with your local Planning Department.

This is a question for the conservation officer in your local planning department. The use of uPVC windows would be fine from a building control perspective but you need to follow both sets of legislation.

It’s always best practice to submit revised as-built drawings particularly with more complex projects and anything related to commercial premises where further consultations may be required. For minor changes to domestic projects revised drawings may not be required but check with your building control surveyor.

The installer should comply with all the relevant building regulations including those related to structure, thermal insulation, glazing and ventilation. This issue should be taken up with the Competent Persons Scheme Operator.