How do I bathroom / kitchen / extension? etc.

These are the labour costs (looks like it's ex-VAT which I'd not factored)

Existing kitchen base units and worktop removed £264.

• Existing tile splash back removed £118.
  
• Ceiling boarded over with new plasterboards £382.
  
• Ceiling and wall section (where the fridge was and splash back section)
  plastered £567.
  
• Water supply and waste pipe for the washing machine and tap/sink
  adjusted to adapt new position £764.
  
• Existing water heater repositioned and replaced with new (including
  rerouting the pipes; instant under sink water heater to be supplied by the
  client) PC SUM £466.
  
• Ducting for kitchen extractor fan supplied and installed £362.
  
• 1no socket plate replaced with new (electrical fittings to be supplied by
  the client) £15.
  
• 1no kitchen extractor fan fuse spur 1 st and 2 nd fix (electrical fittings to be
  supplied by the client) £196.
  
• 2no existing kitchen ceiling lights replaced with new (electrical fittings to
  be supplied by the client £54.
  
• New kitchen base units and laminated/wooden worktop installed (new
  base kitchen units and associated accessories to be supplied by the
  client) £1,289.
  
• Storage front remodelled as necessary - TBC
  
• Wall section between wall and base units lined with new splash back
  board (splash back board and finish trims to be supplied by the client)
  £373.
  
• Washing machine and freestanding electric cooker/oven and extractor
  fan installed and connected (appliances and associated accessories to
  be supplied by the client) £246.
  Ceiling and walls and woodwork prepared and painted (white finish;
  paint to be supplied by the client £1,089.
  
• Licensed waste disposal £330.
  Total: £6,515
  
  

Optional:

• Existing kitchen wall units removed £185.
  
• New kitchen wall units installed (new kitchen wall units and associated
  accessories to be supplied by the client) £766.
  Total: £951
  
  

All above prices are subject to VAT at current UK rate.