They radiate heat and we’re going for a media room vibe.

How expensive per square foot was it to underpin and dig out if you don’t mind saying? Or maybe just how expensive was the initial structural engineer consultation?

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My house was built in 1922. I could not walk in the basement without constantly ducking my head (I'm 6'-3" tall). I was always hitting beams or HVAC ducts or bare light bulbs (always fun when you are bent over for some reason, stand up and take out a light bulb with your head).

I underpinned my entire house coming away with a basement that now has 8'-6" of headroom.

It's a long story and if you are interested, I can tell you how I did it later as I have to get my ass out of bed and head out just now.

But I will tell you this, the pay off is worth it but it is dangerous if you do it wrong. Think stages. Lots of stages.

Perfect opportunity for 2 of these, one to distract, one to keep valuables. https://www.amazon.com/wall-safes-between-studs/s?k=wall+safes+between+the+studs

Can't comment on a sale but the View Plus is a pretty incredible little air quality tester. I move it around periodically when I'm concerned about certain spots and it almost immediately updates with different data. I haven't authenticated the data but the thing has earned my trust. Great for Radon, CO2, VOCs and Particulate Matter readings.

You can use a leaf blower or broom for the base layer, then soapy water and a bucket with a sponge/brush to get what is caked on.

Hmmmmm not really. Tape off open doors with 4 mil plastic, wear a tyvek and p100, seal demo in trash bags, clean up.

You did a good job, but herringbone and grey wood tile? This will be as dated as the bathroom you started with in five years time. Glad you like it tho.

I second /u/Spinaccio's approach for putting a post in. Or posts - I'm having some trouble envisioning how exactly the fireplace is supported by that (where is the ash pit?)

Another option to explore with an engineer... In our house (1931), I've got full access to the exterior basement wall "top plate" (concrete) and the interior wall top plate. If I had this problem under my fireplace, I would just raise the floor a bit temporarily with a jack and slide in at least two brand new joists. I don't know that you would want to sister these to the old joists, though.

But as for your dip... really depends. I've noticed a lot of uneven spots in my floors, but no damage to the joists underneath. What I suspect is happening is 100 years of uneven wear and settling and compression in the softer wood subfloor. If it moves, you could also have the classic subfloor board that ends just shy of a joist.

What I’ve seen done is that you don’t need to frame the walls. You use foam board insulation glued to the concrete walls. Then you can actually glue the sheetrock directly to the foam board. All your electrical would then be inside your exterior framed wall.

Of course, it is too late now since you already put in the interior framing. At this point, the only potential risk is a fire path behind your wall. Not sure about codes in your area. You might want to just double check that.

Curious why you closed in the sky light?

If you can make a central cut out or have one made, that would be secure, but you’ll also lose a bit of height that way so you’ll need taller blocks. The width of the blocks is important for stability.

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It's got a lot of character, as it is.

Most important part is the roof; if it's sound, the rest is just patching.

yes, just make sure to watch some YouTube videos before you do

so do a hack job now by not installing a full floor, instead of maybe possibly doing a hack job later by cutting the floor

This is the only way. I leave it open until "i make sure all the water blows out" every time too.

that's a gonner . seems unsafe

I’m thinking of keeping it! https://i.imgur.com/osiyzWE.jpg

I like it. But a large shower like that really deserves a ceiling mounted rain shower.

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Sorry, I should have mentioned this is in the UK so the terminology is probably different. It's a plastering and decorating company, which is the kind of business you would get here to do this kind of job. But I do agree that it is a shoddy job.

You don’t need to dig below any frost line. Your basement already does that. You’d cut out the floor below your post because you can’t trust the concrete floor. Who knows how thick it is and how well it was done

You know it's 'time' for the ol' shed to go when you find the entire fire department standing around it debating which is the best way to set it on fire