The fields of mistria house upgrades path has four purchases at the Carpenter's Shop, ending with a second floor. Version 1.0.2 states that the home and Carpenter's Shop must both be fully upgraded before exterior styles unlock, while the fourth purchase requires the Upgrade the Carpenter's Shop questline. Open the current Carpenter menu for the materials, price, and room preview before buying each stage.
Follow the four-stage route
Open the counter menu at the Carpenter's Shop on the Eastern Road and look for the next Home Upgrade. The maintained farmhouse record describes a fixed sequence, so each of the first three purchases follows the previous one. NPC Studio's version 0.12.0 notes independently confirm that two additional home upgrades joined the game in that update, although the official post does not publish their names or costs.
The fourth stage arrived in version 0.14.0. NPC Studio calls it Home Upgrade 4 and says it adds a second story, reached with a placeable staircase, ladder, or teleportation pad. The official post also gives this stage a separate story gate, so completing three paid upgrades alone will not make the last option available.
Treat the home route separately from Farm Expansion. Neoseeker's upgrade menu walkthrough records both options at the Carpenter, but Farm Expansion adds land rather than indoor rooms. Spending on the farm plot will therefore not substitute for the next Home Upgrade or satisfy the fully upgraded home condition in the current exterior-customization notes.
Read what each purchase changes
Home Upgrade 1 changes the starting room, so take a screenshot before buying it if you want to compare the interior afterward. Walk the room edge once construction is complete and move any furniture that blocks the new route. Use the current room itself as the decorating plan.
Buy Home Upgrade 2 and Home Upgrade 3 in the order shown at the Carpenter. Before each purchase, clear a little indoor space and note which furniture groups you want to keep together. Afterward, use the visible room boundaries instead of planning from a copied tile count.
Home Upgrade 4 has a direct first-party description. NPC Studio states that it adds a whole second story and allows access through a placeable staircase, ladder, or teleportation pad. Choose the access item and position after viewing the completed floor in your own house.
Use the Carpenter menu as the cost checklist
Open the Carpenter menu and write down the displayed materials and tesserae before committing a reserve to the next Home Upgrade. Compare that list with storage, keep materials needed for tools or town work separate, and gather only the remaining gap. Repeat the check after each purchase because the next stage has its own menu entry.
Unlock the second floor and exterior styles
Home Upgrade 4 is tied to the Upgrade the Carpenter's Shop questline in NPC Studio's 0.14.0 notes. If the fourth option is locked after you buy the earlier rooms, continue the Town Repair progression until that named quest is complete. The official notes do not reduce this to a friendship threshold, marriage condition, or farm-expansion purchase, so none of those should be treated as a substitute.
The 1.0 release added exterior customization after the house is fully upgraded. NPC Studio says Landen sends a letter that unlocks the styles in the Carpenter's Shop, and version 1.0.2 corrects the letter timing. That newer patch states both conditions explicitly: the Carpenter's Shop and the player's home must be fully upgraded.
If the letter has not arrived, check those two completed states before troubleshooting anything else. Return to the Carpenter's Shop after both are complete and confirm that the game is updated to 1.0.2. The patch does not promise that restarting, waiting an arbitrary number of days, or expanding the farm will bypass an unfinished requirement.
Prepare without locking up your farm progress
Start by reserving the materials named in the live menu without emptying supplies needed for repairs, crafting, or farm buildings. A larger house adds decorating space, but it does not need to stop every other project. Note the displayed requirement and gather only the gap.
For the middle stages, compare every ingot named in the Carpenter menu with the reserve for tool upgrades and town quests. Keep the two budgets separate so a room purchase does not silently consume the next tool plan. Reopen the menu after mining or crafting to check the remaining gap.
Approach the fourth upgrade after the Carpenter quest is visible or complete. Gather from the live menu instead of pre-farming a bundle copied from an older table. This is also the point to obtain or craft the access item you prefer, because the official second-floor description uses stairs, a ladder, or a teleportation pad to move between floors.