If you are looking for information on how to build a garden office or garden room from scratch this post will detail my process from a clear piece of land at the bottom of my garden to a fully lined and insulated garden office with working electrics. The room is actually going to be a garden studio for my daughter but the construction methods and end result are exactly the same if you are building an office.
The project has started with the acquisition of some double glazed windows and french doors from a conservatory that was being dismantled near me. I don’t have any garden office plans, just a vision in my head which I hope to bring to life over the next few weeks. Where possible all the materials will be sourced as cheaply as possible to keep the cost down but without affecting the quality of the build.
I must clarify that I am not a builder or have any experience in the construction of garden buildings. Everything I am learning is from research of garden office designs and building methods, youtube and a just do it attitude.
This build started on 31st March 2017
Day 1- Build your own garden office from scratch
Here you can see the piece of land I have at the bottom of my garden. A few of the windows can be seen against the fence. The building will be 12ft x 8ft. The first job is to dig some holes to put in the footings. Building a garden office by yourself is a big task, but the summer is coming and I am looking forward to some long evenings working in the garden. The spec of this building will be that of a professionally built building like one of these but at a fraction of the cost. I am not a builder just a keen DIYer – I have no plans at the moment just a size and some windows!
Day 2 – Outside frame completed
I have now completed the frame showing the full size of the office, I have put down four concrete blocks sat on concrete foot plates to support the frame, I still need to add another five and then fill in the joists inside the frame.
The frame is constructed from 6×2 tanalised timber held together with 4″ screws. The concrete foot plates are 6″ deep and made from a 5:1 mix of ballast and cement. The concrete blocks sit just proud of the lawn allowing a few inches under the building to allow for good air flow.
Day 3 – Base nearly complete
I have made some good progress today and am 3/4 of the way to finishing the base. I have sunk 4 more concrete blocks in the ground and now have all the supporting points covered. I have also put a central 6×2 running the full length of the base, and am hanging all the joists from it. This will give the base more strength. I have also acquired some 100m Celotex insulation from a skip at my daughters school this is going to be put in the base.
Day 4 – I got some reclaimed wood for the walls.
The wall construction is going to be made with 3×1 softwood. Pricing this up it was coming in at around £3 per length of 2.4m – I am going to need about 60 lengths for the walls a total of £180. Onto my favourite site Gumtree and found a local builder not 5 miles from my house who was clearing some 3×1 timber! I picked up 60 various lengths all over 2.4M plus some 4×2 tanalised timber for roof joists (more on that in a few weeks) for a grand total of £70. The roof joists were going to cost me nearly £80 so today I have saved myself £190!
I am now on the hunt for some more insulation.
All the wood was dry and straight so a real bargain!
I took no time in constructing the first wall. Very simply I worked out the height of the building at the back needed to be 6′ 7″ so I made a square frame and then cut 5 more pieces to make the uprights. I screwed in 3 of these and then located the first window in the frame and added the remaining uprights to either side of the window giving it some strength. A simple cross beam with some supports underneath the window and one wall is finished.
The next task is to finish the base, get some more insulation in there and lay a floor. So I am now looking for some celotex insulation and 18mm OSB3 boards.
So back onto Gumtree and I have found 12 sheets of 25mm Celotex for £5 a sheet – which is a bargain so I bought the lot. I had to chop it in half to fit into my car!
I finished insulating the floor and used 2 sheets putting 50mm under the floor which I used 18mm OSB for. Then got straight into the walls. I am using some reclaimed 3×1/2″ timber and framing each wall. For the back I constructed 3 sections and clad it with 11mm OSB before screwing them into the floor. Started progress on the roof using 4×2 tanalised timber and also enlisted some help to paint the OSB boards before the were installed facing the fence, never to be seen again!
My daughter is painting the second back wall section and we soon had all the back walls up.
The next step is to finish the front. I had acquired another window from ebay as I was looking for a window that spanned the full width of the space. I found a mis-measure window on ebay that was exactly the right size for me. This was a brand new window that had never been installed and using K Glass. This window is better than what I have in my house!
So I now have the window installed as well, the next step is to finish the roof (or at least get a covering of OSB up there) and then get the doors on.
For the roof I have 4×2 tanalised timber at 16″ spacing this will be covered with 18mm OSB and then finally an EPDM roof.
With the roof on I can install the doors – this was very simple as the frame simply screws into the wood frame of the building. The two doors were lifted into place and the hinges screwed into the frame. The building is now semi-water tight and could withstand a light shower.
Build your own Garden Studio – Phase #1 complete
It is starting to look the buildings in the brochures! Can’t believe it has come this far. The next step is to get an EPDM roof on and then I am going to be working on the insulation on the inside and starting the first fit on the electrics for lights and sockets.
Total cost of the build so far is £547 which I don’t think is bad for a completely bespoke 12×8 garden office fully insulated and double glazed.
1 x UPVC French door plus 4 windows – (dismantled conservatory) £100
6×2 Floor Joists £99
Bullet Screws – £18
Insulation – £50 (Gumtree)
Concrete Blocks, Cement, Ballast and some sharp sand – £18
60 lengths of 3×1 and 9 lengths of 4×2 tanalised roof joists (reclaimed from local builder) £70
18mm OSB for Floor and Roof plus 11mm OSB for walls – £192