Upgrading your tools, farm buildings, and crop quality is essential to progressing smoothly in Coral Island. This Coral Island Tools Upgrades guide breaks down everything you can upgrade at the Blacksmith, Carpenter, and Laboratory, along with the costs, materials, and build times.
Coral Island Tools Upgrades Guide 2025 – Carpenter Buildings, Laboratory
Blacksmith – Tool Upgrades
The Blacksmith handles all of your tool upgrades. Each upgrade tier (Bronze → Silver → Gold → Osmium) improves efficiency and unlocks new farming or mining possibilities.
Axes
- Bronze Axe – 1,500g + Axe ×1, Bronze Bar ×5, Wood ×20 → 1 day
- Silver Axe – 3,000g + Bronze Axe ×1, Silver Bar ×5, Wood ×20 → 2 days
- Gold Axe – 10,000g + Silver Axe ×1, Gold Bar ×3, Hardwood ×5 → 2 days
- Osmium Axe – 20,000g + Gold Axe ×1, Osmium Bar ×3, Hardwood ×5 → 4 days
Hoes
- Bronze Hoe – 1,500g + Hoe ×1, Bronze Bar ×5, Wood ×20 → 1 day
- Silver Hoe – 3,000g + Bronze Hoe ×1, Silver Bar ×5, Wood ×20 → 2 days
- Gold Hoe – 10,000g + Silver Hoe ×1, Gold Bar ×3, Hardwood ×5 → 2 days
- Osmium Hoe – 20,000g + Gold Hoe ×1, Osmium Bar ×3, Hardwood ×5 → 4 days
Pickaxes
- Bronze Pickaxe – 1,500g + Pickaxe ×1, Bronze Bar ×5, Wood ×20 → 1 day
- Silver Pickaxe – 3,000g + Bronze Pickaxe ×1, Silver Bar ×5, Wood ×20 → 2 days
- Gold Pickaxe – 10,000g + Silver Pickaxe ×1, Gold Bar ×3, Hardwood ×5 → 2 days
- Osmium Pickaxe – 20,000g + Gold Pickaxe ×1, Osmium Bar ×5, Hardwood ×5 → 4 days
Watering Cans
- Bronze Watering Can – 1,500g + Watering Can ×1, Bronze Bar ×5 → 1 day
- Silver Watering Can – 3,000g + Bronze Watering Can ×1, Silver Bar ×5 → 2 days
- Gold Watering Can – 10,000g + Silver Watering Can ×1, Gold Bar ×3, Resin ×3 → 2 days
- Osmium Watering Can – 20,000g + Gold Watering Can ×1, Osmium Bar ×3, Resin ×5 → 4 days
Scythes
- Bronze Scythe – 1,500g + Scythe ×1, Bronze Bar ×5, Wood ×20 → 1 day
- Silver Scythe – 3,000g + Bronze Scythe ×1, Silver Bar ×5, Wood ×20 → 2 days
- Gold Scythe – 10,000g + Silver Scythe ×1, Gold Bar ×3, Hardwood ×5 → 2 days
- Osmium Scythe – 20,000g + Gold Scythe ×1, Osmium Bar ×3, Hardwood ×5 → 4 days
Fishing Pole and Bug Net Upgrades
These upgrades require Kelp Essences instead of metal bars, obtained through diving and refining.
Bug Nets
- Bronze Bug Net – 2,000g + Bronze Kelp Essence ×5, Wood ×20 → 2 days
- Silver Bug Net – 5,000g + Silver Kelp Essence ×5, Wood ×20 (requires Bronze Net) → 2 days
- Gold Bug Net – 10,000g + Gold Kelp Essence ×5, Hardwood ×5 (requires Silver Net) → 2 days
- Osmium Bug Net – 15,000g + Osmium Kelp Essence ×5, Hardwood ×20 (requires Gold Net) → 4 days
Fishing Poles
- Bronze Fishing Pole – 2,000g + Bronze Kelp Essence ×5, Wood ×20 → 2 days
- Silver Fishing Pole – 5,000g + Silver Kelp Essence ×5, Wood ×20 (requires Bronze Pole) → 2 days
- Gold Fishing Pole – 10,000g + Gold Kelp Essence ×5, Hardwood ×5 (requires Silver Pole) → 2 days
- Osmium Fishing Pole – 15,000g + Osmium Kelp Essence ×5, Hardwood ×20 (requires Gold Pole) → 4 days
Carpenter – Buildings & House Upgrades
The Carpenter expands your farm with animal housing, production buildings, and house upgrades.
Animal Buildings
- Coop – 2,000g + Wood ×100, Stone ×50, Bronze ×5, Fiber ×10 → Holds 4 coop animals → 2 days
- Barn – 3,000g + Wood ×200, Stone ×100, Bronze ×5, Fiber ×10 → Holds 4 barn animals → 2 days
- Stable – 15,000g + Scrap ×50, Stone ×200, Silver ×5 → Holds 1 horse → 2 days
Animal Housing Upgrades
- Coop Lv.2 – 4,500g + Hardwood ×20, Stone ×50, Fiber ×10 → Holds 8 animals → 2 days
- Coop Lv.3 – 10,000g + Hardwood ×35, Stone ×70, Fiber ×20, Gold ×3 → Holds 12 animals → 3 days
- Barn Lv.2 – 6,500g + Hardwood ×40, Stone ×100, Fiber ×10 → Holds 8 animals → 2 days
- Barn Lv.3 – 15,000g + Hardwood ×60, Stone ×120, Fiber ×20, Gold ×5 → Holds 12 animals → 3 days
Utility Buildings
- Well – 2,000g + Stone ×60, Wood ×10, Bronze Kelp Essence ×1 → Water source → 2 days
- Mill – 2,000g + Scrap ×20, Wood ×50, Bronze ×2 → Processes grain → 2 days
- Silo – 2,500g + Scrap ×20, Stone ×300, Resin ×2 → Stores hay → 2 days
- Fish Pond – 7,000g + Scrap ×20, Stone ×50, Seaweed ×20, Gold Kelp Essence ×1 → Multiplies fish → 2 days
- Insect House – 7,000g + Compost ×20, Hardwood ×15, Sap ×10, Gold ×1 → Multiplies insects → 2 days
- Shed – 5,000g + Wood ×200, Stone ×200, Gold ×5 → Empty building → 2 days
House Upgrades
- Stage 1 – Free + Wood ×50, Stone ×20 → Adds basic decor (TV, cabinet, rug, fireplace).
- Stage 2 – 5,000g + Wood ×100, Stone ×50, Bronze ×10 → Adds kitchen & fridge → 3 days
- Stage 3 – 40,000g + Wood ×200, Stone ×150, Silver ×10 → Adds second floor, marriage unlocked → 3 days
- Stage 4 – 120,000g + Hardwood ×200, Stone ×300, Gold ×10 → Adds children & furnished rooms → 3 days
Laboratory – Crop Quality Upgrades
The Laboratory lets you improve seeds, seedlings, saplings, and hay quality using Kelp Essences. Each tier improves crop yields and resilience.
- Seeds – Bronze (2,000g + 5 Bronze Kelp Essence) → Silver (5,000g + 5 Silver Kelp Essence) → Gold (10,000g + 5 Gold Kelp Essence) → Osmium (20,000g + 5 Osmium Kelp Essence) → 2 days each
- Seedlings – Same structure, but requires 6 essences instead of 5.
- Saplings – Requires 7 essences per tier.
- Hay – Requires 8 essences per tier.