What Deck Builders Need to Know About Material Markup

Deck builder material markup is one of the clearest ways to tell a profitable deck business from one that breaks even. Most deck contractors understand framing. Not all of them understand margins.

This guide covers what markup actually is, how to set it for deck materials, and why getting it right matters more now than it did a few years ago.

The Gap Between Material Cost and Profitability

A lot of deck builders price jobs by doubling labor and adding material at cost. That's not a markup strategy. That's a recipe for losing money on good-sized jobs.

The average markup for residential contractors in 2026 falls between 20% and 30%, according to industry benchmarks from Angi and Contracting Empire. The average profit margin for US contractors overall runs around 7%, per Turner and Townsend's 2024 International Construction Market Survey. The gap between those two numbers is where overhead lives.

If you're marking up materials at 10% or 15%, you're not covering overhead. You're covering your supplier's invoice and leaving your truck payment, your insurance premium, and your time driving to the lumber yard unpaid.

Material costs for residential decks typically represent about one-third of total project cost in a well-structured estimate. That's the rule of thirds: one third materials, one third labor, one third overhead and profit. If your materials aren't covering their share of overhead, labor has to pick it up, and labor estimates are already hard to get right.

What Material Markup Actually Covers

More Than Just the Invoice

When a homeowner thinks about markup, they think you're adding a margin on top of cost to make a profit. That's true, but markup covers more than the profit line.

Markup on materials pays for:

Procurement time: Sourcing materials, comparing quotes, making calls, picking up or coordinating delivery.
Carrying cost: You often pay for materials before the customer pays you. That float costs money.
Price risk: Between your bid and your order, lumber prices can move. Markup is a buffer.
Returns and waste: Not all waste goes back. Some materials you ordered don't get used and can't be returned. Markup absorbs that.
Invoice processing: Someone has to match receipts to jobs and code them correctly. That's overhead.

None of these show up on the material invoice. All of them are real costs.

The Math on Margin vs. Markup

These terms get confused a lot, and the confusion costs contractors money.

Markup is what you add to cost. 25% markup on $1,000 of materials = $1,250 sale price.

Margin is what you keep as a percentage of revenue. $250 gross profit on $1,250 revenue = 20% gross margin.

If you want a 25% gross margin on materials, you need to mark them up by 33%. Not 25%.

A lot of contractors set a markup target based on what they want to make, then discover their margin is lower than expected. The fix is to understand the math before you price, not after you close the books.

Setting Your Deck Material Markup by Category

Lumber and Framing

Structural lumber (PT 2x10 joists, 4x4 and 6x6 posts, LVL beams) has become one of the more volatile material categories in residential construction. Lumber prices have swung dramatically since 2020. The 2024-2025 period saw some stabilization, but regional variation is significant.

Apply a markup of 25-35% on dimensional lumber. The higher end is warranted if you're sourcing specialty sizes, handling delivery coordination, or carrying inventory between jobs.

Don't lock in a lumber price on a bid you submit six weeks before the job starts unless you've got a firm quote from your supplier with a hold date.

Decking Surface Material

Decking surface material, whether pressure-treated, composite, or hardwood, deserves its own markup line and often warrants a higher rate than framing lumber.

Composite decking from brands like Trex, TimberTech, or Fiberon runs $5-$15 per linear foot for the boards alone, before installation. Hardwood decking (ipe, cumaru, mahogany) runs $8-$20+ per linear foot. These are high-cost materials with real procurement effort.

Apply 30-40% markup on premium decking materials. Your supplier relationship, your warranty knowledge, and your installation expertise all justify it. You're not just selling the board. You're guaranteeing it goes in correctly.

Hardware and Fasteners

Hidden fasteners, joist hangers, post caps, lag screws, and structural connectors add up on a deck job. It's easy to treat hardware as a rounding error. It's not.

On a $25,000 deck job, hardware can run $1,000-$2,500. Apply your standard markup. Track it. Don't fold it into labor and lose visibility.

Concrete, Footings, and Site Materials

Concrete for footings, gravel for drainage, post anchors, and string lines all carry real cost. Apply the same markup you use on other materials.

If you're digging footings with a rented auger, that equipment cost belongs in the estimate, not buried in your truck overhead.

Tracking Materials Through the Job

The Receipt Problem

Most deck builders have a receipt problem. Receipts come from the lumber yard, Home Depot, the specialty decking supplier, and the local fastener house. They arrive on paper, via email, and photographed on the seat of the truck.

If you can't match every receipt to a job at month-end, you're not closing the books right. Material costs that don't get attributed to the right job make your job cost numbers wrong. Wrong job cost numbers mean you're pricing future jobs based on bad data.

This is how deck contractors underprice their second and third jobs. The first job looked fine in the bank account. The job cost report told a different story.

Change Orders and Material Substitutions

Clients change their minds. Lumber yards run out of the board you specified. Substitutions happen.

When material substitutions happen, document them immediately. If you substituted a more expensive board because your spec was unavailable, that's a change order. If you absorbed the cost without documenting it, that's a gift to the client you didn't intend to give.

Change orders for material differences need to go out the day the substitution happens. Not at the end of the job.

Material Waste on Deck Jobs

Calculate It Before You Order

Deck material waste is real and predictable. Plan for it:

Composite decking: 10-15% waste for straight runs; 15-20% for diagonal.
Pressure-treated lumber: 5-10%.
Railing systems: 10-15% (posts, cuts, and connectors).

Order the waste. Running out of decking at 90% completion and waiting for a new order is more expensive than the extra boards you'd have returned.

Don't Return to Raise Your Average Cost

Some contractors habitually return unused materials at the end of a job. That's fine for large volumes. But frequent small returns cost you procurement time and sometimes restock fees. Factor this into your waste calculation up front.

How Bit & Grain Helps Deck Builders Track Material Markup

Running a deck business without tracking job-level material costs is flying blind. You might have a good quarter in the bank account and terrible margins on every job.

Bit & Grain gives deck builders the tools to track materials through the whole job. The estimates and invoicing tools let you build line-item estimates with markup built in at the material level. You see gross profit before you submit the bid.

The receipt scanning feature handles the receipt problem. Photograph the receipt on site and it links to the job. You're not reconciling a pile of paper at month-end.

At $29/month flat, it's built for small deck operations. Not just big commercial builders with a full office staff.

Conclusion

Deck builder material markup is the difference between running a profitable operation and working hard for a thin margin. The math isn't complicated. Cover procurement costs, price risk, carrying cost, and waste. Know the difference between markup and margin. Apply markup consistently across every material category.

Build a system, run it on every job, and your pricing gets better every season.

Start free at bitandgrain.app.