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Thread: Getting a builder to build a garden office - any idea on costs please

  1. #1
    Craftsman
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    Getting a builder to build a garden office - any idea on costs please

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

    This is what Im 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

  2. #2
    Master Franco's Avatar
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    There has been a good thread here:

    https://forum.tz-uk.com/showthread.p...=garden+office

  3. #3
    Master
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    10 years ago I paid 20k ish including installation but not groundworks for a 9m x 6m wooden garage, lined internally with 20mm marine ply with insulation behind. 3ish of the price was cedar shingles on the roof but the cladding is only softwood.

    Add 1k or thereabouts for electrics.

    I'm not sure you could have a wooden building plastered, it will move too much and crack the plaster, dry lining is the best you'll get.

    Have all four walls in cedar or you'll curse yourself when you are slapping preservative on one wall every three to four years.

  4. #4
    Craftsman
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    Jan 2015
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    I would expect to pay in the region of 20k for a flat roof cabin of those dimensions. This is based a construction of substantial materials and not the thin wood often found on the off-the-shelf variety, along with full wall and floor insulation, electrics and UPVC windows.

  5. #5
    I was quoted 41k for a 6m x5m cedar garden room from one of the big players. This excluded electrics running to it.

    I then asked a good carpenter to quote for the same and he came in at 11k plus the bifold plus the base. It was likely to be c.20k via that route so around half price.

  6. #6
    My company has built these two. Budget around 15-20k. The bottom one is my office and measures 3x5m excluding the decking.




  7. #7
    Wow! Nice outbuildings on those pictures! A lot nicer than the newly-built-old-fashioned ones we see here in back-gardens...

    Just thinking: when you use this as an office in the summer, doesn't it get very hot? In other words: do you need an airco for that?

  8. #8
    Quote Originally Posted by thieuster View Post
    Wow! Nice outbuildings on those pictures! A lot nicer than the newly-built-old-fashioned ones we see here in back-gardens...

    Just thinking: when you use this as an office in the summer, doesn't it get very hot? In other words: do you need an airco for that?
    Ive got a dunster house one I built myself a few years ago. Its fine in summer with the doors open. I did put extra insulation in the roof which I think keeps it cooler in summer as well as warmer in winter. When its really hot a fan is a help! Also electric underfoor heating was definitely worth it for cold days like now.

  9. #9
    For the OP, approaching 20k is about right for a fully finished job Id say.

  10. #10
    Quote Originally Posted by thieuster View Post
    Just thinking: when you use this as an office in the summer, doesn't it get very hot? In other words: do you need an airco for that?
    This summer was the first Ive used mine and it did get very hot, its well insulated but theres a lot of glass and a huge sky light.

    Ive applied reflective film to the glass which helps a good amount. Its also less bright and more private. A Dyson fan cooled a bit too but I may get an aircon unit next year.

  11. #11
    An air con unit is essential. My office went over 30C in the summer when the air con PCB broke.

  12. #12
    Craftsman
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    Uk
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    Although not a home office a few shots of my garden Room I had a builder do.
    This was three years in the planning and a lot of thought went in so my thoughts.
    I looked at every option on the market from insulated log cabins from the likes of dunster house to to composite insulated panels and also one built of SIPS.
    In the end I went for a traditional timber build, we'll insulated including the use of cedral cladding which is more or less maintenance free.
    I ended up with a building that is warm with minimal heating and can be used all year round.

    But believe me for something right of good quality there is no cheap options!!!



    Sent from my GM1913 using Tapatalk

  13. #13
    Master yumma's Avatar
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    We built a 30sq.m Pilates Studio around 3 years ago, it was bespoke built to a good spec, it cost 15k, weve added A/C and underfloor heating this year at a further 5k.

  14. #14
    Craftsman
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    Thanks for all the advice people.

    A local place does what Im after for about 15k so maybe that isnt too bad a price. I was thinking I could get it done for about 8k but think Im living in cloud cuckoo land !!!

  15. #15
    Master
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    A decent garden building will be 20K plus.
    My summerhouse was a Dunster House thing. Not a patch on the quality of the one in my old house but it's ok and cost about 3K up and built. It's cold in the winter - I bought a 20 heater. It's hot in the summer - I bought a 20 fan.
    Works for me.

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