New floors, windows, doors.... cost?

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We are thinking of putting in an offer on a house with a view to doing a big extension in five years time - it has a great garden and is in a wonderful neighbourhood with good schools so we are really initially buying it for its location and potential.

It's 1930s built with a sound roof according to the survey. However, in order to live in it we will need to replace doors (internal and external), floors (thinking engineered wood downstairs, laminate upstairs), skirtings, architraves and windows. We have requested a quote from 3 builders but they won't be able to quote until after our next meeting with the bank and I am desperate to figure out a ball park figure before then so that we have an idea of what we're getting ourselves in for. Would anyone have any info about the likely cost and the likely timescale? The house is 2,000 sq feet. We are in south east (not London).

We will also need a new kitchen and bathrooms and insulation but I have priced these up separately.

The flooring would be relatively easy to work out if you have a floor plan - work on about £60 per square metre for engineered oak, probably about 30% on top for fitting. £20-£25 per square metre for laminate - might be less if you can get deals.

We got solid replica 30s panelled doors for around £100 plus door furniture about £20 each.

As a ball park figure, depending on whether you have 30s bay windows and the number, somewhere between £7-10k for the windows including fitting.

External doors are expensive (at least composite are, wooden / upvc are cheaper). Ours from Solidor was £1200.

Skirting and architrave isn't particularly expensive in itself £1-2k maybe but the labour of fitting and subsequently painting is quite labour intensive (maybe £2k on top).