Can you soundproof inside the house easily?
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I can't remove walls and ceilings but would like to find ideas for soundproofing.
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Some helpful tips that you can do without much change is to line your walls with furniture- bookshelves, ect and add rugs/carpets. They'll absorb the sound and help with the soundproofing
I agree with Hillela that adding rugs, carpets, etc. are the way to go. If there is a room that's noisy (music playing, gym equipment, etc.) you could also try hanging some heavy drapes or a cloth wall hanging, like a tapestry.
One thing I do, when I do have major work being done, is add some Safe and Sound insulation inside the wall or ceiling before it's closed back up. It has the added benefit of being non-combustible. Inside interior walls, it helps muffle sound from one room to another.
I found a egg crate foam mattress topper and framed it in with 1x3 s, stood the thing up between the wall and behind bookshelves. it worked fantastically.
You can also build a "party wall". Use some 2" x 2" boards, make a wall/frame, floor plate, studs, and ceiling plate, but do not attach it to the existing wall, do however attach it to the floor and ceiling, about 1" from the existing wall. Then you can use Styrofoam, or other sound deadening material, between the 2x2 studs then hang sheet rock on it, just like the wall behind it. The sound proofing material and the dead space between the party wall and the existing wall will keep the sound vibrations from being transmitted through the existing, thus making the room soundproof. It makes the room a little bit smaller, but it will do what you are wanting.
When we were poor, we rented a house that had cracks in the outside walls. I happened to have many family quilts that I nailed over the walls. No frames, no tacks, just odd nails I found. It cut out a lot of weather and sound. Blankets, especially two layers, should work, too, and maybe even Command strips. Still have the quits after fifty years, rusty nail marks and all.)
Save your egg cartons.
If you like old quilts, this possibly would be something to put on some of the walls to muffle the sound.