A couple of (random) thoughts. The thickness of the concrete pad should probably be set by the weight of the machine tools you want to install rather than building regulations. The choice of steel versus brick may well be down to what the local planners consider to be appropriate to the area. Steel would certainly be quicker but I can't imagine the planners being happy if it looks like an Atcost barn! Have you considered a room above as a man cave. It would also be neat to have a loo and kettle point and sink included. The only danger is that you might find yourself relegated there, even if it is better than the doghouse.

Andrew

Whilst I was investigating Workshop replacement, I saw these metal buildings.

Steel/foam composites with various insulation levels, in a range of sizes, with all sorts of door and window options.

Still need a purpose base but it sounds like that might not be a problem for you.

They looked a good unit, might be worth checking out on their website here:-

**LINK**

Edited By V8Eng on 27/12/2015 19:10:13

Would a timber framed/wood clad effort look out of place ? Wooden buildings are nice and warm, may be a Heritage style oak framed thing if budget allows.

UK regulations: If close to the boundary (and who can afford an estate where it won't be) no larger than just a little smaller than a garage, about 60m2 I think if made of wood. However, helpfully pointed out by Neil on another shed thread if it is 'essentially non inflammable' then it can go to about twice the size next to the fence.

A few years ago there was a ME or MEW article showing a steel frame with steel sheet hung on it which looks the way to go for me but using the foam filled steel sandwich sheets which are now standard on industrial business park buildings. Seconds and used sheets are available but don't look so good as brick or timber. Probably 6 in for the roof and at least 4 in for the walls. This is more expensive that brick or timber but less labour. It is a no-brainer for the roof either way. I'll try to find the issue later, I think I know which pile of 30 mags it's in but you know how one gets sidetracked when looking for something in ME.

Foundation depends on substrata to some extent. 4in reinforced will hold a ton or two over 4in of polyurethane insulation. Remember to have insulation round the perimeter of the slab and the walls outside that. That means decoupling brick walls from the slab on separate foundations but steel sandwich can hand down outside the slab.
Worth considering laying in underfloor heating pipes while you are doing it, just in case you decide it is a good idea as they can't go in after.

Plumbing in a loo will give you planning problems as it looks like you are intending to let it out to migrants. Even mains water attracts that attention in a summerhouse in London.

Planning also allows you a carport style structure (2 sides must be open) so try to plan that into your layout even if you don't make it initially.

I am currently building a small timber shed on thermalite stub walls with slab insulated as above and clearing the site for the main shed which will be tin sandwich.

Hi for what it's worth here's my suggestion, we have just totally refurbished an old cottage literally down to 3 walls, I had thought, since we had room I would build a big workshop and steel frame seemed the way to go research done and gentle suggestion to the treasurer! She said " sod that it will look awful and you will always be cold in there so I won't be rid of you for any length of time, build a brick one" so I did and don't regret it for 1 moment cavity wall insulated and the concrete base is almost the same in all the cost was about the same check out the government planing portal you can build upto 40% the area of your garden under permitted development which means you only need building control and not planing permission

i have now fitted out two engineering sheds (AKA Man caves) and have come to the conclusion that they should be designed from the inside out.. for instance if you want a "Grand Design", i.e. big white walls, a single bench a machine over in the corner, then a plastered interior which needs supports at 400mm centres. If you go for the more typical hodge podge of home shelving, recovered kitchen units and a home made bench, then you need 3/4" chipboard internal walls so brackets can be put in any where. These would need support at 600mm centres. The floor should be insulated in all cases.Concrete screed gets slippery with oil spillage. Carpet picks up swarf. I think 22mm T&G P5 chipboard is a good compromise. The ceiling can be made from any sheet material but must be painted white immediately after construction.

Thought should be given to how and where the power is going to be run and especially for that gizmo you lust after (but can't afford yet).

Now you have a theoretical box which you need to clad in insulation and make weather tight. Unless you expect people to throw bricks at it, the skin need not be very strong, for instance I think 6mm marine ply would be the optimum solution, if painted with a suitable proofer it should last with zero maintenance for over 30 years. My shed #1 did and looked the same when I sold the house after 31 years.

If a single brick wall is of any length it would need double brick piers every 2m, which complicate the inner box. You will also need some roof ties to stop the roof blowing off, you need frame work for the windows and door. You need to engineer some way of fastening the inner box to the outer brick one.

It could be built as a conventional cavity wall with internal insulation. Takes up a lot of room, but is very nice, paint it white , put fixings in any where, but expensive.

Insulated steel cladding made by Corus, ready insulated. needs an internal frame to carry its weight and to keep the roof on. Very awkward to get the roof to seal at ridge and eaves.and to fit rain water goods. It can look very nice if you manage to buy suitable shapes/colours. Look at your local B&Q/Wickes etc, this is what they are made from. One problem is that the roof is mean't to sit on purlins (RSJs in the stores) hard to do in sheds.*

hard to interface with your 3/4" universal bracket locating boarding?

Corregated iron, like the Corus stuff with out any advantages and many disadvantages.

In non brick cases think about water dripping of the structure and splashing UPWARDS and possibley under your construction. raise a wooden structure 12" of the ground?

Frank

* I still have 200+ super long (6"?) self tappers for the sheets that have the tall thin ridges running down them.

The issue I was referring to is MEW 116 June 2006 by Dick Gays. I wonder if he is around to provide some more pictures and report on long term use.

My figure above of 80m2 was rubbish. 160sqft is more like it.

FYI an amateur organisation I know wanting a clubhouse got planning permission for a timber building about 100m2. The paperwork alone cost £2000 and the timber building shell was £25k with the same again to finish the inside. A brick equivalent would be under £10k in materials but needed the specialised labour to put it together. Project currently stalled.

Planning regs keep changing and get confusing. I was fortunate enough to ask for and get a visit from local planning officer when i bought this farm. While he vetoed my original bullsh1t over wanting a 'farm office and seperate workshop' he happily pointed out that the pervious owners had illegally planted a row of trees long enough ago to give amnesty and had extended the curtilage by about 3 acres! And that i could erect temporary buildings within that curtilage to (I think) half the area.

My hobby shed went on an insulated concrete base, timber framed, insulated with 3" celcon and UPVC clad with ply lining and a faux tiling alloy roofing. The only real error in all that was not bulding it three times the size…..

One day you, or your heirs, may want to sell your property. A good double garage will increase the value of the property while a steel shed will be a hindrance.

When I had my second garage (workshop) built, as a double, I needed planning permission and building regulation inspection. I did not mention workshop in the planning application since I thought it smacked of running a business, a good way of upsetting neighbours (remember they can really hinder the progress of a planning application). I read the planning application form and decided you could convert the new garage to a workshop after some time. Also planning officers cannot be naive enough to believe that cars live in garages. Using a local business to draw the plans and get the planning permission etc and a builder recommended by neighbours the whole exercise cost me about £5000 twenty years ago. It was even finished within the time period given by the builder.

JA

I had a 5m x 3m timber cabin erected in my garden for use as a workshop and it's been great. The timbers are 44mm thick and the floor and roof are insulated. The double glazed windows and door are well sealed into the frames. I've had no problems with damp or condensation at all. I painted the inside timbers white so it's nice and bright to work in. I also lined the floor with ply and painted it with floor paint. Previous brick and concrete garages I've worked in were a nightmare for equipment going rusty and terribly cold on the feet.

I did know some one who built a garage much as Mike mentions on the cheap out of the thicker grade of exterior ply. As he mentions marine grade would be better but at a pinch given suitable treatment it should be ok.

Our neighbour here built a garage recently and used concrete blocks. A bricklayer can put these up at an amazing rate and they do provide some insulation, even the heavier ones. The cheapskate hasn't had it rendered or even masonry painted afterwards which I am pretty sure he will regret at some point.

I had a concrete pad laid. I used a company that does car parks and even larger jobs. They turned up with a jcb, carefully levelled the site keeping it well compacted even removing a tree and a troublesome stump from a large one that had been cut down. put a damp proof membrane down and then poured around 7" of concrete over the lot. Not much hardcore needed. They cut in a couple of expansion breaks into it. They also ran a wacker plate over it early on the day after laying it.

I chose a Black Country lot to do the job. That's where my folks come from and we can be a pretty prickly lot so work is often done with some care around there. I was pleased with the price but was told that I could have done the job for less. Hire a driver and jcb for a day or so as needed and then a concrete company to lay it as they would come along with the shuttering as well. That would leave me to do the supervision though but if I need one in future ………………..

As to what people can do, building regs etc the local authority people can be very helpful. Just phone up and ask. Some will also explain what can be done without needing to meet some of the building regs and make suggestions about how what ever it is could be done. As a for instance it would be rather difficult to double glaze our living room so adding a conservatory would make sense but a conventional one wouldn't fit in with the style of the house. Not done but they did after asking a couple of times help clear up what is or isn't a conservatory. In our case it would be a bit more like a permitted extension. I also asked a buildings inspector about reroofing a property. That proved to be a very worth while phone call – what was used etc. Better to trust them than what a contractor might choose to do.

John

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When our old pavilion blew up a tree we bought one of these for the Model Engineering Club. http://www.beaverlogcabins.co.uk/clockhouse-log-cabin-5-5-x-4-0m.html

They are available fully insulated, and the price is very reasonable. The only problems are that the walls grow up and down with moisture content, so you've got to be careful when attaching cabling etc to it as it would be ripped apart, and in driving rain water can get in around the window frames, but we are on a very exposed site, and we have a master plan to cure it, just waiting for the round tuits to come. If you're anywhere near the north west come and have a look.