OSRS Construction Calculator

Q: How much does it cost to get 99 Construction in OSRS?

It depends on the planks you use. Mahogany tables: about 93,000 mahogany planks, which is roughly 150M to 200M gp at Grand Exchange prices. Oak larders: about 217,000 oak planks, often over 100M gp. Mahogany Homes: far cheaper because each contract uses few planks, but it takes many more hours. Buying logs and paying the sawmill to cut them is cheaper than buying finished planks most of the time.

Updated Sep 5, 2026 By Jehan Wadia

Introduction

Construction is one of the fastest skills in Old School RuneScape, and also one of the most expensive. This OSRS Construction calculator shows how many planks you need, how much gold it will cost, and how long it will take to hit your goal level.

Type in your current Construction level or XP, then pick a goal. You can also load your stats straight from the OSRS Hiscores by typing your username. Prices come from live Grand Exchange data, so the gold cost stays close to what you will really pay.

The calculator covers popular training methods like oak larders, mahogany tables, teak garden benches, gnome benches, and Mahogany Homes contracts. For each one you get XP per action, actions needed, total plank cost, GP per XP, XP per hour, and butler trips.

You can also add your Carpenter's outfit pieces for bonus XP, switch to Ironman mode for sawmill prices, turn on a League XP multiplier, and set your play time per day to see how many days the grind will take.

How to use our OSRS Construction Calculator

Enter your Construction level or XP, your goal, and a few options. The calculator shows how many builds you need, how much GP it costs, and how long it takes to hit your goal.

RuneScape username (RSN): Type your player name and select Load Stats to pull your Construction level and XP from the OSRS Hiscores. You can skip this and type your stats by hand.

Account Type: Pick Main, Ironman, or F2P. Main uses Grand Exchange plank prices, Ironman uses sawmill fees, and F2P shows no methods because Construction is members-only.

Play time per day: Enter how long you train each day in hours or minutes. This adds a calendar-days column. Leave it blank or 0 to hide it.

Show time-to-goal in: Choose minutes, hours, or days for all time results.

Current Construction — input mode: Choose Level or XP. The box you pick is the one you type in, and the other one fills itself.

Current Level: Type your Construction level from 1 to 99.

Current XP: Type your exact Construction XP, up to 200,000,000. Use this for 99+ accounts.

Goal — input mode: Choose Level or XP for your target.

Goal Level: Type the level you want, from 2 to 126. Levels 100 to 126 are virtual levels.

Goal XP: Type the XP you want to reach, up to 200,000,000.

Quick goal presets: Select a button like Lv 77, Lv 83, Lv 99, Lv 100, or 200M XP to set your goal fast.

League Mode: Turn this on during a League and enter your XP multiplier from 5 to 32. All XP rates get boosted by that number.

Carpenter's Outfit Bonus: Tick each piece you own. The helmet, shirt, trousers, and boots add up to a 2% XP boost.

Method category: Filter the table by Popular, Supplies, Mahogany Homes, Sailing, Other, or All.

Sort methods by: Order the table by Recommended, fastest XP per hour, cheapest GP per XP, lowest total cost, lowest level, or name.

Methods I Can't Use Yet: Choose Show All, Greyed Out, or Hide for builds above your level.

Refresh GE prices: Select this to pull live Grand Exchange prices. If it fails, the calculator uses built-in prices.

Select (in the table): Pick the radio button next to any method to use it in the Plan Summary and the step-by-step math.

Calculate and Reset: Select Calculate to update your results, or Reset to put every setting back to default.

What Is Construction in Old School RuneScape?

Construction is a members-only skill in Old School RuneScape (OSRS). You use it to build furniture in your player-owned house (POH). Every time you build something, you gain Construction XP. The skill goes from level 1 to level 99, and it takes 13,034,431 XP to reach 99.

How You Train Construction

You build items on hotspots inside your house, then remove them and build again. You need a hammer, a saw, and planks. Most training is done in the Building mode of your house, where items build instantly and cost no money to remove.

There are four plank types. Normal planks are cheap but slow. Oak planks are the budget choice. Teak planks are middle cost. Mahogany planks give the most XP but cost the most gold.

Popular Training Methods

Oak larder (level 33): 8 oak planks for 480 XP. A cheap, common early method.
Mahogany table (level 52): 6 mahogany planks for 840 XP. Very fast, but expensive.
Teak garden bench (level 66): A cheaper option than mahogany with good XP.
Gnome bench (level 77): 6 teak planks for 840 XP. One of the best XP rates in the game.
Mahogany Homes: A repair minigame that is much slower but far cheaper. It is the top pick for ironmen and low-cash players.

Servants and Butlers

Fast training needs a servant to fetch planks from your bank while you build. The demon butler is the best one. He carries 26 planks per trip and needs level 50 Construction and 5,000 gp per 8 tasks. Without a servant, you must run to the bank yourself, which cuts XP rates by more than half.

Carpenter's Outfit

The Carpenter's outfit comes from Mahogany Homes. Each piece gives bonus Construction XP: helmet +0.4%, shirt +0.8%, trousers +0.6%, and boots +0.2%. Wearing all four gives +2% XP. The bonus works on almost all Construction training.

Cost of Training

Construction is one of the most expensive skills in OSRS. Getting from level 1 to 99 with mahogany planks can cost hundreds of millions of gp. Cheaper routes exist: buy logs and pay the sawmill operator to turn them into planks, or use Mahogany Homes to trade speed for savings. Ironmen usually make their own planks at the sawmill.

Why Train Construction

A good house saves you a lot of time. You get teleports to many places, a gilded altar for fast Prayer XP, a pool that heals and restores stats, an ornate jewellery box, and portals to the Wilderness and other spots. Level 99 also unlocks the Construction skill cape.

Formulas used

OSRS XP required for a level

\text{XP}(L) = \left\lfloor \frac{1}{4} \sum_{\ell=1}^{L-1} \left\lfloor \ell + 300 \cdot 2^{\ell/7} \right\rfloor \right\rfloor

XP remaining to goal

\text{XP}_{\text{to goal}} = \max\left(0,\ \text{XP}_{\text{goal}} - \text{XP}_{\text{current}}\right)

Effective XP per action (outfit bonus and League multiplier)

\text{XP}_{\text{action}} = \text{XP}_{\text{base}} \times \left(1 + \frac{B_{\%}}{100}\right) \times M_{\text{league}}

Actions (builds) required

N_{\text{actions}} = \left\lceil \frac{\text{XP}_{\text{to goal}}}{\text{XP}_{\text{action}}} \right\rceil

Total GP cost of materials

C_{\text{total}} = \sum_{i} N_{\text{actions}} \times q_i \times p_i

Cost efficiency (GP per XP)

\text{GP/XP} = \frac{C_{\text{total}}}{\text{XP}_{\text{to goal}}}

Time to goal in hours

t_{\text{hours}} = \frac{\text{XP}_{\text{to goal}}}{\text{XP}_{\text{base/h}} \times \left(1 + \frac{B_{\%}}{100}\right) \times M_{\text{league}}}

Butler trips required

N_{\text{trips}} = \left\lceil \frac{N_{\text{actions}} \times q_{\text{planks}}}{26} \right\rceil

Frequently asked questions

How much does it cost to get 99 Construction in OSRS?

It depends on the planks you use.

Mahogany tables: about 93,000 mahogany planks, which is roughly 150M to 200M gp at Grand Exchange prices.
Oak larders: about 217,000 oak planks, often over 100M gp.
Mahogany Homes: far cheaper because each contract uses few planks, but it takes many more hours.

Buying logs and paying the sawmill to cut them is cheaper than buying finished planks most of the time.

How long does it take to get 99 Construction?

You need 13,034,431 XP for level 99.

Fast plank methods like mahogany tables or gnome benches with a butler: about 20 to 30 hours.
Oak larders: about 45 to 55 hours.
Mahogany Homes: 130 to 200 hours, since XP rates sit near 20k to 90k per hour.

Construction is one of the fastest 99s in the game if you have the gold for it.

What is the fastest way to train Construction in OSRS?

Build, remove, and rebuild the same hotspot in Building mode while a demon butler runs planks from your bank.

Level 52 to 76: mahogany tables (6 mahogany planks, 840 XP).
Level 77+: gnome benches (6 teak planks, 840 XP) are cheaper per XP and just as fast.

Speed comes from clicking fast, so keep your build and remove menus in the same spot on screen.

How many mahogany planks do you need for 99 Construction?

Starting from level 1, mahogany tables need about 93,000 mahogany planks. Each table uses 6 planks and gives 840 XP, so you build roughly 15,500 tables.

Wearing the full Carpenter's outfit cuts that by about 2%, saving around 1,800 planks.

What is the cheapest way to train Construction?

Mahogany Homes is the cheapest. Contracts use only a handful of planks and also pay out carpenter points for the Carpenter's outfit.

If you want to build in your house instead, use oak planks. Buy oak logs, take them to a sawmill operator, and pay the small fee to turn them into planks. That costs much less than buying planks straight off the Grand Exchange.

How much does the sawmill operator charge per plank?

The sawmill operator in Varrock charges a fee per log:

Normal plank: 100 gp
Oak plank: 250 gp
Teak plank: 500 gp
Mahogany plank: 1,500 gp

You still pay for the logs, but the total is usually well under the Grand Exchange plank price.

Is the Plank Make spell cheaper than the sawmill?

Yes. Plank Make is a Lunar spell that needs 86 Magic and Dream Mentor. It charges 70% of the sawmill fee: 70 gp for normal, 175 for oak, 350 for teak, and 1,050 for mahogany, plus runes.

It saves the most gold on mahogany, but it is slower than making a bulk trip to the sawmill.

What level do you need for the demon butler and how much does he cost?

The demon butler needs 50 Construction and the quest The Grand Tree. He costs 10,000 gp for every 8 tasks.

He carries 26 planks per trip, which is more than any other servant. Below level 50, use the regular butler, who carries 20 planks and costs 5,000 gp per 8 tasks.

How do you get the Carpenter's outfit in OSRS?

You buy it with carpenter points from Amy at the Mahogany Homes shop in Falador. Points come from finishing contracts.

Boots: 200 points (+0.2% XP)
Helmet: 400 points (+0.4% XP)
Trousers: 600 points (+0.6% XP)
Shirt: 800 points (+0.8% XP)

All four pieces together give +2% Construction XP.

Does the crystal saw boost Construction?

Yes. The crystal saw gives +3 invisible Construction levels, so you can build things 3 levels early. You get it from The Eyes of Glouphrie quest.

It does not give bonus XP. It only helps you unlock builds sooner, like mahogany tables at level 49 instead of 52.

Is Mahogany Homes worth doing?

Yes, if gold is tight. It gives far more XP per plank than building at home, so it is the top choice for ironmen and low-cash accounts.

You also earn carpenter points for the Carpenter's outfit, plus supply crates with planks, nails, and coins. The trade-off is speed, since XP per hour is much lower than mahogany tables.

What Construction level do you need for a gilded altar?

You need 75 Construction to build a gilded altar in your chapel. It needs 2 marble blocks and 2 gold leaves.

With two burners lit, bones give 3.5 times their normal Prayer XP, which makes it the most popular way to train Prayer.

Can free-to-play players train Construction?

No. Construction is a members-only skill. Free players cannot buy a house, cannot build furniture, and cannot gain any Construction XP.

You need a membership to start the skill at level 1 and buy a house from an estate agent for 1,000 gp.

Should I use teak or mahogany planks for Construction?

Teak is cheaper per XP, mahogany is faster to unlock.

From level 52 to 76, mahogany tables give the best XP rates. At 77 you unlock gnome benches, which give the same 840 XP but use teak planks, so your gold goes much further. Most players switch to teak at 77 and stay there until 99.

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