As of my last knowledge update in September 2021, the fastest way to gain Construction experience in Old School RuneScape (OSRS) involved creating and removing specific high-experience items in your player-owned house (POH). Keep in mind that game mechanics and strategies may have changed since then, so it's a good idea to check the latest updates and community resources for the most up-to-date information. Here's a general outline of the fastest methods available at that time:
Oak Dungeon Doors (Level 74-99):
- Build and remove Oak Dungeon Doors in your dungeon. This method offers some of the fastest XP rates, but it is also expensive.
Mahogany Homes Contracts (Level 1-74):
- Starting at level 1, you can complete Mahogany Homes contracts to gain Construction XP. This method is not the fastest for high levels but offers a cost-effective way to get Construction experience early on.
Oak Larders (Level 33-74):
- Build and remove Oak Larders in your kitchen. This method provides decent experience rates and is more cost-effective compared to Oak Dungeon Doors.
Teak Benches (Level 52-99):
- Once you reach level 52, you can build and remove Teak Benches in your garden. This method is more cost-effective than some of the higher-level options.
Mahogany Tables (Level 52-99):
- Building and removing Mahogany Tables in your dining room is another viable method for gaining Construction XP. It offers good experience rates but is expensive.
Gilded Altars (Level 75-99):
- At level 75, you can build a Gilded Altar and use it to train Prayer. This method also provides Construction XP when you light the burners, making it an efficient way to train both skills simultaneously.
Mythical Cape (Level 47-99):
- If you have access to the Mythical Cape in your POH, you can build and remove it for Construction XP. This is a relatively cheap option compared to some of the others.
Remember that Construction training in OSRS can be expensive, so it's essential to consider your budget when choosing a training method. The fastest methods are often costly, while the slower ones may be more affordable.
Before you begin training Construction, check for any game updates or changes made to the skill, as well as the current prices of construction materials, to ensure that you have the most accurate and up-to-date information for your training journey.