To have a max house in OSRS at 99 Construction, you mainly need the right rooms, the right furniture, and a clean layout for fast teleport access. With 99 Construction, you can build everything without relying on boosts, including the usual endgame POH setup like the ornate rejuvenation pool, ornate jewellery box, portal nexus, occult altar, and skill/storage rooms.

Core setup

A typical max house focuses on these areas:

  • Superior garden: ornate rejuvenation pool, spirit tree, fairy ring, and sometimes a wilderness obelisk.
  • Achievement gallery: ornate jewellery box, occult altar, mounted capes, and other utility teleports.
  • Chapel: gilded altar for Prayer training.
  • Workshop: armour stand for repairing degradable gear.
  • Portal nexus or portal room: teleport storage for common destinations.

What 99 Construction gives you

At 99 Construction, you do not need spicy stew or crystal saw boosts to build the house’s key furniture, which makes the whole setup simpler and less annoying to finish. That also means you can build the fully upgraded version of the house in one go instead of planning around temporary boosts.

Layout matters too

A “max house” is not just the furniture; it is also about placement. Players usually aim for a compact layout so loading is faster and the important rooms are close to the entrance. A tighter, efficient house is more practical than a huge house with extra rooms you rarely use.

Practical checklist

  1. Get 99 Construction.
  2. Build the key utility rooms first.
  3. Put the rejuvenation pool and teleport setup in the most convenient spots.
  4. Add prayer and repair utility.
  5. Fill in storage or niche rooms only if you will actually use them.

Cost and priority

A max house is still expensive even at 99 Construction, because the furniture and teleports are what cost the money, not just the level. If you want the biggest quality-of-life gains first, prioritize the pool, teleport setup, altar, and repair station before decorative or niche rooms.

Fast answer

If you already have 99 Construction, the main thing you “need to do” is build the utility-focused POH layout : pool, altar, teleport hub, workshop, and storage rooms, arranged compactly for convenience. That is what most players mean by a max house.

TL;DR: At 99 Construction, you can build a full max house without boosts; the important part is the room layout and the expensive endgame furniture, especially the pool, teleports, altar, and workshop.