I have had a quote for boarding up my loft with plater board including one wall where the chimney is and a side wall from an extension. The floor which is already partially laid with chip board will be completed in the quite. The quote is £2500. Is this a bit too much? Will get a second quote but your initial opinions are appreciated.
Having watched BBC's Homes Under The Hammer for yonks ... loft conversions usually come in around £5k - 15k on average ... but this involves turning the loft into a living-space. The job that you describe will cost considerably less, if all that you require is a storage space. £2k sounds about right, to me.
I would try to get at least two quotes from recommended tradespeople, if possible.
Over the past few years, I have had a number of jobs done, which I regarded as rather expensive. Materials can cost very little for some projects, its the time and labour costs that soon mount up. Try pricing the materials from a Wickes or Travis Perkins list, and that should perhaps give you some ideas.
Surprisingly £500 isn't a big difference in the building trade, especially if the work is estimated, and not fixed price. Personally I would say £2.000 to £2500 would be about right on an area covering 3 bedrooms, if the job is done right?.