🏗️ Construction Calculator OSRS
Plan your Construction grind — XP, materials, and GP cost from any level to 99
🏗️ OSRS Construction Calculator
Enter your current level and target level to plan your grind
Construction Calculator OSRS: The Complete Guide to Leveling Construction in Old School RuneScape
Construction is one of the most unique — and most expensive — skills in Old School RuneScape. Unlike combat skills that level through gameplay naturally, Construction is a deliberate, resource-intensive grind that rewards planning. The Construction calculator OSRS is the essential tool every player needs before they chop a single plank or hire their first butler. It tells you exactly how many materials you need, how much GP you’ll spend, and how long your grind will take — before you commit a single coin.
I’ve spent thousands of hours in Gielinor, including multiple Construction 99s across both OSRS and RS3, and I’ve helped dozens of clanmates plan their Construction grinds from level 1 all the way to the coveted gold cape. This guide brings together everything I’ve learned about Construction XP rates, material costs, butler mechanics, and the best methods at every level range — so you can grind smarter, not harder.
Whether you’re aiming for a maxed Player-Owned House, unlocking the ornate jewellery box for your friends, or simply pushing to 83 for the gilded altar, this guide and calculator give you the blueprint you need.
How OSRS Construction XP Works
Construction XP is earned by building and removing furniture within your Player-Owned House (POH). The key mechanic is that you earn XP both when you build an item and when you remove it — meaning you repeatedly build and remove the same furniture piece to stack XP rapidly. This is why Construction is one of the fastest skills to train in terms of XP per hour, but also one of the most expensive in terms of resource cost per hour.
The XP Formula
Each furniture piece gives a fixed amount of XP upon construction. You earn the same XP whether you use a regular saw and hammer yourself or have a servant fetch planks for you. The servant system — specifically the Demon Butler — is critical for high-speed training because it eliminates the bank run time that would otherwise cut your XP rate by 50% or more.
Plank Types and Their XP Values
| Plank Type | GP Cost (est.) | XP Per Plank (approx.) | Best Used For |
|---|---|---|---|
| Regular Plank | ~300 GP | 29 XP | Early levels (1–20) |
| Oak Plank | ~600 GP | 60 XP | Mid levels (20–52+) |
| Teak Plank | ~900 GP | 90 XP | Mid levels (35–52) |
| Mahogany Plank | ~1,800 GP | 140 XP | Fast training (52–99) |
Best Construction Training Methods by Level Range
The best training method changes significantly as your level rises. Here’s the full progression I recommend, refined through dozens of grind sessions and community testing:
Levels 1–19: Crude Wooden Chairs and Wooden Bookcases
At the very start, you’re limited to the most basic furniture. Build Crude Wooden Chairs (16 XP each) using regular planks until level 14, then switch to Wooden Bookcases (115 XP, 4 planks) for a faster grind to 19. This phase passes quickly — regular planks are cheap, and you’ll be through it in under an hour. Don’t overthink levels 1–19; just get through them.
Levels 19–33: Oak Chairs and Stools
At level 19, you unlock Oak Chairs (120 XP, 2 oak planks). Oak planks give significantly better XP per plank than regular planks, and the furniture pieces require fewer planks per build, making this the first meaningful efficiency upgrade. Build and remove oak chairs until level 33.
Levels 33–52: Oak Larders (The Efficiency Sweet Spot)
Oak Larders are the landmark unlock of the early Construction grind. Each Oak Larder gives 480 XP and requires 8 oak planks. The XP rate is excellent for the GP cost, and many players with tighter budgets stay on Oak Larders all the way to 99. At peak efficiency with a Demon Butler, Oak Larders yield approximately 400,000–450,000 XP per hour.
Levels 52–99: Mahogany Tables (The Meta Method)
Mahogany Tables are the gold standard of Construction training in OSRS. Each table gives 840 XP and requires 6 mahogany planks. With a Demon Butler and optimal build-remove-dismiss-call cycles, experienced players achieve 800,000–1,000,000 XP per hour. This is the fastest method in the game and remains the top choice for players who prioritize speed over cost.
Levels 74–99: Oak Dungeon Doors (Budget Speed)
For players who want faster XP than Oak Larders but can’t afford Mahogany Tables, Oak Dungeon Doors at level 74 offer 600 XP per build using 10 oak planks. The GP cost per XP is lower than mahogany, making this a strong budget alternative in the endgame stretch.
The Demon Butler: Why It’s Non-Negotiable for Efficient Training
If you’re serious about Construction efficiency, hiring the Demon Butler (requires level 50 Construction) is mandatory, not optional. The Demon Butler is the fastest of all available servants and can carry 26 planks per trip. The critical mechanic is the “dismiss and re-hire” cycle — rather than waiting for the Butler to return, you can dismiss him just before he delivers planks and immediately re-engage him to fetch the next load, effectively reducing dead time between builds to near zero.
Hiring the Demon Butler costs 10,000 GP per contract renewal (every 8 trips), which is trivial compared to the plank and GP costs of the grind itself. Never train Construction at high levels without him — you’ll sacrifice 200,000–400,000 XP per hour compared to optimal butler mechanics.
Total GP Cost: What Does 99 Construction Cost?
| Method | Planks Needed (1–99) | Estimated Total Cost | XP/Hour |
|---|---|---|---|
| Oak Larders (Oak Planks) | ~175,000 oak planks | ~100–120M GP | 400–450K |
| Mahogany Tables | ~76,000 mahogany planks | ~135–160M GP | 800–1,000K |
| Oak Dungeon Doors | ~196,000 oak planks | ~115–130M GP | 500–550K |
These figures assume you start from level 1 and train to 99 using the stated method exclusively. Most experienced players use a hybrid approach — Oak Larders from 33 to 52, then Mahogany Tables to 99 — which can reduce total cost while still achieving high XP rates through most of the grind.
The Plank Make Spell: Cutting Your Construction Cost
If you have a high Magic level (level 86 for the Lunar spellbook’s Plank Make spell), you can convert logs directly into planks at a cost lower than buying them from the Grand Exchange. This is especially effective for:
- Oak logs → Oak planks (saves ~100–150 GP per plank)
- Teak logs → Teak planks (saves ~200–300 GP per plank)
- Mahogany logs → Mahogany planks (saves ~400–600 GP per plank)
For a 99 Construction grind using Mahogany Tables, using Plank Make instead of buying planks can save 30–50 million GP — a significant sum. This requires time invested in Plank Making runs, but for budget-conscious players, it’s one of the most impactful cost-reduction strategies available.
Construction Boosts: Getting to Key Levels Faster
Several temporary boosts can raise your Construction level, letting you build higher-tier furniture before you reach the required level naturally:
- Spicy Stew (brown spice): Can boost Construction by up to +5 levels. This is random and requires multiple bowls of stew, but a +5 boost unlocks content 5 levels above your current level.
- Crystal saw: Provides a +3 invisible boost to Construction when held, specifically for furniture that requires a saw to build. This effectively lowers the Construction requirement for many pieces by 3 levels.
- Mahogany homes: This minigame provides Construction XP without requiring you to own a POH, and completion rewards can be used to purchase the carpenter’s outfit, which provides a 2.5% XP boost when worn during Construction training.
The Gilded Altar: Why Construction Level 75 Is a Major Milestone
For many players, the single most important Construction unlock isn’t level 99 — it’s level 75, when you can build the Gilded Altar. A fully lit Gilded Altar (with two incense burners) provides a 350% Prayer XP bonus when offering bones. This makes training Prayer in a friend’s or host’s house dramatically faster and cheaper than burying bones manually or using the Chaos altar in the Wilderness.
If you’re building Construction primarily to host altar services for your clan or the community, your target is level 75 and you can stop there. If you’re pushing all the way to 99, the gilded altar is just one of many milestones along the way.
Planning a large grind like Construction 99 requires the same mindset as planning any major performance goal. Just as athletes use tools like the one rep max calculator to map out their strength progression, experienced OSRS players use the Construction calculator to map out their XP milestones, material requirements, and GP budget before committing to the grind.
Notable Construction Unlocks Worth Grinding For
| Level | Unlock | Why It Matters |
|---|---|---|
| 42 | Mythical Cape Rack | Required for Dragon Slayer II reward storage |
| 50 | Demon Butler | Fastest servant — essential for efficient training |
| 65 | Ornate Jewellery Box | Teleport hub for POH — huge QoL for all players |
| 72 | Occult Altar | Switch spellbooks in POH without visiting Lunar Isle |
| 75 | Gilded Altar | 350% Prayer XP bonus with burners lit |
| 83 | Mounted Digsite Pendant | Instant Fossil Island access from POH |
| 99 | Construction Cape | Teleports to POH with no need for house tabs |
Construction and the Grand Exchange: Timing Your Plank Purchases
Mahogany and oak plank prices fluctuate on the Grand Exchange based on demand from players training Construction, supply from players converting logs with Plank Make, and general market activity. Before starting a large grind, check the current GE price and compare it to recent highs and lows.
If prices are elevated, consider buying planks in smaller batches over time rather than purchasing your entire supply at once. Alternatively, if you’re doing a rushed grind, buying all planks upfront locks in your price and prevents mid-grind market swings from disrupting your plan. The Construction calculator helps you determine your exact plank requirements so you can make this purchasing decision with precise numbers rather than estimates.
Smart resource management across multiple systems is a skill in itself. Whether you’re optimizing construction material costs in OSRS or evaluating the resale value of assets in the real world, tools like the gold resale value calculator reflect the same principle: know your numbers before you commit your resources.
Ironman Construction: Special Considerations
Ironman accounts cannot buy planks from the Grand Exchange, which fundamentally changes the Construction grind. Ironmen must obtain planks through:
- Woodcutting their own logs and using the sawmill (costly in GP from skilling)
- Using the Plank Make spell on self-cut logs (requires high Magic)
- Collecting planks from Trouble Brewing or Construction supply crates (very slow)
- Wintertodt supply crates for planks and nails (early game)
For ironmen, the Construction grind is significantly longer and requires careful integration with Woodcutting and Magic training. Using the OSRS Construction calculator is even more critical for ironmen because every plank represents real gathering time — waste is far more costly than for main accounts who can simply buy more planks.
Frequently Asked Questions (FAQs)
Conclusion
The Construction calculator OSRS is your essential planning tool before you start the most expensive skill grind in Old School RuneScape. It tells you exactly how many planks to buy, what your total GP cost will be, and how many builds separate you from your next milestone. Armed with that information, you can train Construction confidently — not recklessly.
Start with Oak Larders, graduate to Mahogany Tables, hire your Demon Butler at 50, and never underestimate the value of a few minutes of planning before you commit tens or hundreds of millions of GP to the grind. Good luck — and may your saw never miss.
For more in-depth calculator tools across other domains, check out the character headcanon generator for creative character building — the same love of detailed planning that makes a great OSRS player makes for rich character development too.