Building your own PC is usually cheaper, but the savings depend on what you're comparing and what you already own

A custom-built PC typically costs 10 to 20 percent less than a pre-built machine with the same components. The reason is straightforward: you skip the retailer's assembly labor, their profit margin, and their customer support markup. A $1,500 pre-built system with an RTX 4070 and Ryzen 7 processor might cost you $1,200 to $1,250 in parts if you source them yourself.

But that advantage shrinks or disappears depending on three things: whether you're comparing similar performance levels, whether you already have peripherals and a monitor, and whether your time has a dollar value. A budget pre-built ($400 to $600) often has a smaller markup than a high-end one, so the percentage savings is lower. And if you need to buy a case, power supply, and Windows license separately, those costs add up fast.

The real question isn't whether building is cheaper in theory—it usually is. The real question is whether it's cheaper for your specific situation, and whether the time investment makes sense for you.

Key Takeaways

  • Building your own PC saves money on labor and retailer markup, typically 10 to 20 percent compared to a pre-built with identical parts.
  • The savings shrink if you need to buy a case, power supply, monitor, keyboard, and Windows separately, which pre-builts sometimes bundle.
  • Pre-built systems under $600 have smaller percentage markups than high-end machines, so the cost difference is less dramatic at the budget end.
  • Sourcing parts takes research time, and mistakes in compatibility or part selection can cost you money in returns or wasted purchases.
  • If you already own a case, power supply, or monitor from an old build, building new saves significantly more than buying pre-built.

Where building saves the most money

Building saves the most when you're upgrading an existing PC rather than starting from scratch. If you already have a case, power supply, and monitor, you only need to buy the CPU, motherboard, RAM, storage, and GPU. That's where the real cost is, and you're not paying anyone to assemble it. A $1,000 GPU upgrade in a pre-built system might cost you $1,100 to $1,150 once the retailer adds their margin. Building it yourself costs $1,000.

Building also saves more at the high end. A $3,000 pre-built system might have a $400 to $600 markup. A $1,000 pre-built might have a $100 to $150 markup. The percentage is similar, but the dollar amount is bigger, so it feels more worth your time.

You also save if you're willing to buy parts from multiple retailers. A single pre-built seller has to source everything from their suppliers, which limits their negotiating power. You can buy the CPU from one place, the GPU from another, and RAM from a third if prices are better. Pre-built retailers can't do that as easily.

Where building costs more or breaks even

Building costs more than buying pre-built when you factor in everything you actually need. A pre-built system often comes with Windows already installed and activated. Building yourself means buying a Windows license separately, which costs $120 to $200. Some pre-builts also include a monitor, keyboard, and mouse. If you need all three, that's another $200 to $400 you have to add to your parts cost.

You also have to buy a case and power supply separately. A decent case costs $60 to $150. A reliable power supply costs $80 to $200. A pre-built system has these built into its price, but you don't see them as line items. If you add them up—case, power supply, Windows license, monitor—you might be looking at $500 to $700 in extras. That can wipe out your 10 to 20 percent savings entirely.

Budget pre-builts ($400 to $700) have smaller markups than high-end ones, so the percentage you save is lower. A $500 pre-built might have a $50 to $75 markup. Building the same system yourself saves you that $50 to $75, but you still need to buy Windows and a monitor if you don't have them. The math gets less attractive.

The hidden costs of building yourself

Sourcing parts takes time. You need to check compatibility between the CPU and motherboard, verify that your power supply has enough wattage for your GPU, make sure your RAM is on the motherboard's compatibility list, and confirm that your case has enough space for your cooler. Mistakes here are expensive. Buying an incompatible motherboard or a power supply that's too weak means returns, restocking fees, and time spent troubleshooting.

Prices also change constantly. A GPU that costs $400 today might cost $350 next week or $450 the week after. If you're not watching prices closely, you might buy at a peak and regret it. Pre-built retailers buy in bulk and lock in prices, so they're less exposed to daily fluctuations.

Assembly itself is straightforward if you follow a guide, but if something goes wrong—a bent pin on the CPU, a RAM stick that doesn't seat properly, a power connector that doesn't fit—you're the one troubleshooting it. Pre-built systems come with a warranty and customer support. If your build doesn't turn on, you're on your own.

Comparing actual prices: a real example

A mid-range pre-built system with an RTX 4070, Ryzen 7 5700X3D, 32GB RAM, and 1TB SSD typically costs $1,500 to $1,600 from retailers like Best Buy, Newegg, or Amazon.

Building the same system yourself: RTX 4070 ($350 to $380), Ryzen 7 5700X3D ($280 to $320), motherboard ($150 to $180), 32GB RAM ($80 to $100), 1TB SSD ($70 to $90), case ($80 to $120), power supply ($120 to $150), and Windows ($120 to $200). That's roughly $1,250 to $1,540 in parts alone, before tax and shipping.

If you already own a case and power supply, you're down to $950 to $1,070. If you also have Windows from a previous build, you're at $830 to $870. The savings grow the more you already have.

When buying pre-built makes more sense

Pre-built systems make sense if you don't want to spend time researching parts or if you value the warranty and support. A three-year warranty on a pre-built system is worth something if your hardware fails. Building yourself means you're relying on individual manufacturer warranties, which are usually one year and require you to contact each company separately.

Pre-builts also make sense if you need the system quickly. Building and testing takes a few hours. Waiting for parts to arrive takes days or weeks. If you need a working PC this week, a pre-built from a local retailer is faster.

They also make sense if you're buying at the budget end ($400 to $800). The markup is smaller, the time investment is the same, and the dollar savings are less compelling. You might save $50 to $100, which doesn't justify the research and assembly time for most people.

How to maximize savings if you do build

Buy your GPU last. Graphics card prices fluctuate more than any other component. Lock in your CPU, motherboard, and RAM first, then wait for a GPU sale. You might save $50 to $100 on the single most expensive part.

Reuse what you have. If you have a case, power supply, monitor, or keyboard from an old build, use it. Every component you don't have to buy is money saved. Even a five-year-old power supply can work fine if it's reliable.

Buy Windows on sale or use a student license if you're may be able to access. Windows goes on sale regularly, especially during Black Friday or back-to-school season. Some retailers also bundle it with hardware purchases. A student or educator license is $10 if you may have access to.

Watch for bundle deals. Some retailers offer discounts if you buy a CPU and motherboard together, or a GPU and monitor together. These can shave $20 to $50 off your total.

Frequently Asked Questions

How much money do you actually save by building a PC?

You typically save 10 to 20 percent compared to a pre-built with the same parts. On a $1,500 system, that's $150 to $300. The savings are larger if you already own a case, power supply, or monitor, and smaller if you need to buy everything separately including Windows.

Is building a PC hard enough that it's not worth the savings?

Assembly itself is straightforward and takes two to four hours if you follow a video guide. The harder part is researching parts for compatibility and watching prices. If you value your time at more than $40 to $50 per hour, the savings might not justify the effort.

What if I make a mistake building my PC?

Most mistakes are fixable. Bent CPU pins, unseated RAM, and loose power connectors are the most common, and all can be corrected. If something is truly broken, you're covered by the manufacturer's warranty on that part. You'll need to contact them directly rather than going through a retailer's support.

Do pre-built systems come with everything I need to use them?

Most come with the tower, monitor, keyboard, and mouse. Some include Windows; others require you to buy it separately. Check the product listing carefully. Building yourself means you need to buy or have all of these separately.

Is it worth building a PC just to save a few hundred dollars?

That depends on your situation. If you already have peripherals and a case, the savings are real and worth the time. If you're starting from zero and need to buy everything, the savings shrink to $50 to $150, which might not be worth the research and assembly time.