House

Time and cost
The upgrade time starts at 1 hour and increases by 1 hour per level. The time can be reduced with the Swift village strength and other house speed boosts. After level 100, the time will increase by 2 hours per level.

The cost starts at 1000 of each resource and increases with formula: 1000+(1000*(level-1)^1.25). You can view the cost for the first 100 levels here.

House Speed Boost
The formula for the house boost is as follows: (1 + (swiftLevel * 2 / 100) + explorationPercentage) * (1 + partyPercentage + tilePercentage) To apply the boost onto the timer, divide the time with the calculated boost. Example: Level 100 Barrel = 101 hours Level 30 Swift, 20% exploration boost, 5% party bonus, 5% tile bonus = 198% 101 / 1.98 = 51.01 hours, or 2d 3h 0m 36s

Kitchen
These are battle boosts, they are additive with the relic battle boosts.

Chairs
Increases your crit chance by 1% per level.

Stove
Increases your crit damage by 1% per level.

Sink
Increases your multistrike chance by 1% per level.

Basket
Increases your healing chance by 1% per level.

Living Room
These are cave boosts and cost more resources than the others. The cost formula that they follow is 5000000+(5000000*(level-1)^1.25).

Table
Increases your cave treasure diamond amount by 1% per level. This gives a % chance to get +1 diamond for every treasure tile.

Couch
Increases your cave gear drop chance by 1%. This helps to improve drop gear chances after the reduction caused by depth. For reference, the formula for cave gear drop chance is.

Carpet
Increases your cave movement speed by 0.1s. Unlike other upgrades, this boost does not increase every 15 levels and cannot be leveled further past 100.

Candlestick
Increases your cave room size by 0.5%. This applies to the width and height of the room where the walls are placed. Normal rounding rules apply.

Garden
These are partner resource boosts, they are additive with relic resource boosts.

Pitchfork
Increases your meat income by 1% per level.

Shed
Increases your stone income by 1% per level.

Fountain
Increases iron income by 1% per level.

Tools
Increases your wood income by 1% per level.

Bedroom
These are crafting boosts. Since the crafting skill is no longer in the game, these have been removed.

Bed
Increases your crafting luck by 1% per level.

Closet
Increases your crafting power by 1% per level.

Nightstand
Increases crafting boost by 1% per level.

Window
Increases crafting consistency by 1% per level.