Am looking at getting a home-office built at the top of the garden. I’ve had a look at some local pre-fab units but these are coming in at around £12k+ (more with groundwork + cedar + extras) and I’m guessing that finding a competent builder locally could reduce the cost by a fair chunk.

This is what I’m looking for:
• 5m x 3.6m wooden structure with overhang roof
• Patio door and corner window
• Cedar cladding on exterior (not at the rear as this won't be visible)
• Plastered walls and ceiling
• Electrics
• Groundwork

Something not a million miles away from this I suppose - https://www.moderngardenrooms.com/su...e-canopy-room/

Any idea what costs would likely be for this please based on:
• Timber
• Cedar cladding (sides and front only)
• Patio door and single window
• Insulation
• Roofing
• Misc - paint / lights / sockets / flooring
• Labour: groundwork / build / electrics / plastering