This is a specification 3.

This is  hugely popular.Comes with concrete slate tiles,4x2 c16 framing,22mm nominal Sweedish redwood  loglap.(32mm nominal upgrade available)Prices from £3530 for 16x10 

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specifiaction 2

Comes with 22mm nominal Sweedish pressure treated loglap(32mm nominal loglap upgrade available),3x2 c16/24 treated studwork,felt shingled roof.prices from £2995 for a 16x10

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specifiaction 1

Comes with 19mm finished pressure treated shiplap,3x2 c16/24 treated studwork,bitumen corrugated roof prices from £2925 for a 16x10

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