Stair Stringers

I'm at a loss as to what you plan to do, can you do a drawing or post a photo that looks like the result you want?

 

and what pray tell are you going to do with the brick steps?

 

The stringer is a part of the stairs when they are made not an add on. It is possible to attach these afterwards but I doubt you could.

 

Are you saying you just want to put a stringer on to the existing stairs. ???

 

I think he is planning attaching false strings.

 

Mark out the going and rise on a suitable piece of timber using 2 clamps and a roofing square, cut it out with a jig saw, test fit, throw it away because it doesn't fit, go to the pub.

 

Without dimensions, I dont think the stairs in the basement meet building res.

The max height of riser is 220mm, seems a littler higher to me?

 

It's a bit immaterial Jit, they must have been signed off years ago.

 

Part may be original, but they seem to be modified, as they seem to have newer timber treads?

Just saying as the word 'proper room' was mentioned.

I am planning a loft conversion, and these are things to consider, as well as fire escape.

 

Cut your stringers and stick em to the wall, make up cardboard templates if you're not confident.
Clad the risers and steps in timber.

 

I see what you mean about the treads, I doubt this is going to be under building control.

 

It's obvious to me as to what you're trying to achieve with those stairs

The basements now looking good, like a "proper" room and you want the stairs to look like a "normal" timber staircase at home, not a cast concrete and brick slab

Looks like the treads have been clad with old scaffold board ? But that too is looking tired now

Guess could clad the risers and treads with new timber, either stain the lot or carpet the lot or carpet treads and paint / stain the risers

Could cut out a false stringer and just add to the staircase, some no nails and plugs and screws, caulk gaps and paint - depends on what finish you want as to method and materials

Instead of a stringer could mitre sections of architrave or similar trim and fix around treads and risers

Doubt the current stairs will be that square so could level them when you clad with timber, then nice simple 45's with a chop saw and fix the trim instead of a stringer

Again, depending on the finish, any gaps can be filled, caulked and painted

Reckon as a diy'er it's doable but labour costs would be high if you were to get a pro in

Go for it I say mate

 

Mark them up in sections and cut them out of a sheet of 18mm MDF, do them in 1200mm sections so its not to big to handle, making templates out of cardboard.

 

The most cost-effective would be to buy the stair stringers and do the installation yourself (you can buy them online). It is not a difficult task to do, especially if you are DIY savvy.
Timber would give a fresher and more natural look, so I prefer them. I would recommend the company that I work for, but I don't want to sound promotional.
One of my colleagues did a video on how to install stair stringers, but the stairs are different. Still, maybe it will help you:

 

You might as well form it out of mortar. lay out battening materials and simply trowel it all in flush to the battens and it will bond to the brick stairs better. sorted in a day

 

Did you look at the photo the OP posted?