Our general manager, Jim Guerette, can help you find the double helix spiral stair that will elegantly complement your home and still meet your space requirements. Starting wit the lower stairs, center the boards on each tread, if you would like a small gap between them, use a pencil placed in between the boards while you nail them in. Glue the boards to the stairs and toenail them in place with a nailer (I used pocketholes here because, again, I got all crazy with the Kreg Jig, but nails will be easier.). Also glue and nail the tops of the panels to the stair rail, making sure that they are level and the gap is even between the boards.
You need a minimum of 2000mm of clear headroom above the pitch line on a domestic staircase to comply with building regulations (there is a slight relaxation on this for loft conversions look at the appropriate page in the building regulations).A typical size for your Stairwell is to have it the same size as the staircase layout, usually you wouldn’t get away with a staircase being more than half a tread under the stairwell on a typical standard rise height staircase.
The terraced house I’m in at present has the stairway going across (like B above), with bedrooms opening directly off either side at the top, in the original plan (I’ve out a corridor through to the bathroom, which was formerly off the back bedroom).It works very well, as I have a flat roof (unusual in a house from 1905) and there’s a generous skylight over.
When the length limitation of a staircase (the total run) seems to dictate a too-narrow tread-width, consider cutting the top step into the upper floor, as in Photo 2. In this case, the stairs were not to protrude out onto the lawn any farther than necessary, but the design still called for 12″ treads to achieve the desired overall appearance and walkability.
Most staircases are steeper than they need be, and most are that way just because the designer either didn’t want to put in the extra effort required to make a more comfortable staircase fit in the same space, or the builder (or owner) wanted to keep things simple and cheap.” Often, it does take some extra time and effort to plan the perfect staircase.
This is just like when framers (good framers that is) use same adhesive before installing decking to floor joists. If you’re not sure how large of room you need, measure your existing furniture, tables and walking area to determine how much space you REALLY need in your next floor plan. Their design for a narrow terraced house includes an open-plan ground floor with the staircase near the centre of the plan.