Lean to shed/workshop, what base to use? and some other questions

[User1234567890]

I'm looking to build a lean to shed/workshop on the side of my house. It'll be slightly narrower than a single garage, and will be a shed/workshop and storage area. I was going to build it using the same methods as a garden room, fully insulated all round, wood construction and a couple of rows of brick at the bottom and a roof material, yet to be decided, although I would like to tile it, if the structure is up to it. It will be a long and narrowish structure, up to 2.4m wide and up to 7.4m in length. This lean to will completely block any access to the rear of the property, but it will have doors on both ends for access. The existing back door is on the side of the house, so would open into the lean to. There's another set of doors at the rear of the house.

First of all, would say, a concrete base, reinforced with rebar at a depth of maybe 25cm be ok for this, or will I need proper footings? Aside from the roof, if tiled, there's not going to be a great deal of weight, just shed contents, tools and a workbench etc.

Would I be obliged to get the building regs people involved in this?

If I were to put a washer and dryer in there at a much later date? Does that change anything, as far as building regs go?

Thanks.

 

[Deluks]

Standard 100mm concrete base will be fine for this, make it thicker at the edges under the brick course.
You could even just do a simple strip foundation and lay down 50mm thick 'council' slabs for the floor.
This approach could mean that in the future if you wanted to rebuild it as a proper extension opened to the house, then your footings are already in place.

Any drains or manholes underneath?

The washer or dryer won't be a problem but you'll need an electrician to install it and use IP rated protected sockets.

In the meantime, for just using a power tool every now and again or a light or radio, an extension lead with an RCD will do. (But you don't want to be running a washer and dryer off of this)

 

[User1234567890]

Thanks. Yes, there is a rainwater drain that runs from front to back, I'm not sure exactly where it is, but I think it's close to the side wall of the house, looking at the two grids that it joins. Not sure how deep. No manholes.