Building a 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 computer with the same processor, graphics card, and memory. You avoid the retailer's markup and the cost of assembly labor. But that advantage shrinks or disappears if you need to buy tools, if you're comparing against a sale price rather than full retail, or if you factor in your own time spent researching and assembling.
The real question isn't whether building is cheaper in theory — it usually is — but whether it's cheaper for your specific situation. That depends on what you're building, what you're comparing it against, and what you already have at home.
Key Takeaways
- Building saves money mainly by cutting out retailer markup and assembly labor, typically 10 to 20 percent on the final price.
- The savings disappear if you're comparing a custom build against a pre-built computer on sale, which often undercuts the component cost.
- You may need to buy tools like a screwdriver, thermal paste, and a static wrist strap, which adds $15 to $40 to your first build.
- Time spent researching compatible parts, troubleshooting, and assembling has a real cost if you value your hours at all.
- Warranty and support are simpler with a pre-built — one company handles the whole machine — whereas a custom build spreads warranty across multiple manufacturers.
Where the savings actually come from
When you buy a pre-built PC from a retailer like Best Buy, Dell, or HP, you pay for the components, the labor to assemble them, the retailer's overhead, and their profit margin. That markup typically ranges from 15 to 25 percent of the component cost. A $1,000 pre-built machine might contain $800 to $850 in actual parts.
When you build yourself, you buy the same components directly from suppliers like Newegg, Amazon, or Micro Center and skip the middleman. You also skip the assembly labor, which a manufacturer charges for even if you don't see it itemized. That's where most of the savings live.
The catch: retailers frequently discount pre-built machines to move inventory, especially during sales events like Black Friday or back-to-school season. A pre-built that normally costs $1,200 might sell for $900, which undercuts the component cost of a custom build. Comparing a full-price pre-built against a custom build makes building look cheaper than it actually is.
The hidden costs of building yourself
Building requires tools and supplies you may not already own. A basic Phillips-head screwdriver works, but a magnetic one prevents dropped screws inside the case. Thermal paste bonds the processor to its cooler — some coolers include it, others don't. A static wrist strap prevents electrical discharge from damaging components. A flashlight or headlamp helps you see inside the case. These items cost $15 to $40 total for a first build.
You also need to spend time researching. Choosing compatible parts — making sure the motherboard fits the case, the power supply has enough wattage, the cooler clears the RAM — takes hours if you're new to it. Troubleshooting if something doesn't work takes more hours. If you earn money during those hours, that time has a cost. If you're building on a weekend and you enjoy the work, the cost is zero.
Shipping can also eat into savings. Buying five components from five different sellers means five shipping charges, though many retailers offer free shipping over a certain order amount. Buying from a single retailer like Micro Center or Newegg reduces shipping costs but may limit your ability to find the lowest price on each part.
When a pre-built actually costs less
Pre-built computers on sale often beat custom builds on price. A retailer with excess inventory will discount aggressively to clear stock. During these sales, a pre-built can cost less than the sum of its components, because the retailer is willing to take a loss to move units.
Pre-builts also make sense if you need the machine when ready. A custom build requires waiting for parts to arrive and then time to assemble. A pre-built ships ready to use. If you need a computer for work or school in the next week, the convenience has value.
Warranty and support also favor pre-builts. When something fails, you contact one company — Dell, HP, Lenovo — and they handle the repair or replacement. With a custom build, a failed power supply means contacting the power supply manufacturer, a failed motherboard means contacting the motherboard manufacturer, and so on. That fragmentation takes time and patience.
Comparing actual prices: an example
| Component | Custom Build Cost |
|---|---|
| Processor (Intel Core i5-13600K) | $280 |
| Motherboard (B760) | $140 |
| Memory (32GB DDR5) | $110 |
| Storage (1TB NVMe SSD) | $80 |
| Graphics card (RTX 4060) | $280 |
| Power supply (750W) | $80 |
| Case | $70 |
| CPU cooler | $40 |
| Component total | $1,080 |
| Tools and supplies (first build) | $25 |
| Your total cost | $1,105 |
A comparable pre-built with the same parts might list for $1,400 to $1,500 at full retail. That's a $300 to $400 savings for building. But if that same pre-built goes on sale for $1,100, you've saved almost nothing — and you've spent your time assembling instead of doing something else.
What affects whether building saves you money
The type of computer matters. Budget builds ($500 to $800) see smaller percentage savings because the component cost is lower and the retailer's markup is smaller in absolute dollars. High-end gaming or workstation builds ($2,000 and up) see larger savings because the markup is larger in absolute dollars. A $500 pre-built might have a $75 markup; a $2,500 pre-built might have a $400 markup.
Timing matters. Building during a slow retail season means you're comparing against full-price pre-builts, which favors building. Building during a sale season means you're comparing against discounted pre-builts, which favors buying pre-built.
Your location matters. Micro Center has physical stores in some US cities and offers in-store pickup with no shipping cost. If you live near one, building is cheaper. If you live far from any computer retailer, shipping costs for multiple components add up.
Your skill level matters. Your first build takes longer and carries more risk of mistakes. Your fifth build takes half the time and almost no risk. If you plan to build multiple machines over time, the per-machine savings increase because you already own the tools and you work faster.
The non-financial reasons to build or buy
Some people build because they enjoy it, want to understand their machine, or need a specific configuration that no pre-built offers. Those are valid reasons that have nothing to do with cost. Some people buy pre-built because they don't want to troubleshoot, prefer a single warranty, or don't have time to research parts. Those are also valid.
If your main reason for considering a build is to save money, calculate the actual numbers for the specific machine you want. Look up the price of each component you'd buy, add shipping, add tools if it's your first build, and compare that total against the current sale price of a comparable pre-built. That comparison tells you whether building saves money in your situation.
Frequently Asked Questions
Do I need special tools to build a PC?
A magnetic Phillips-head screwdriver is the only essential tool. A static wrist strap, thermal paste, and a flashlight are helpful but not required — many people build without them. If you already own a screwdriver, your tool cost is zero.
What if something breaks during assembly?
Most components are robust and survive normal handling. The main risk is static discharge, which a wrist strap prevents. If a component arrives dead, the manufacturer's warranty covers it whether you built the machine or a retailer did. You contact the manufacturer directly, not the retailer.
Is a pre-built warranty better than buying parts separately?
A pre-built warranty covers the whole machine under one policy. A custom build spreads warranty across manufacturers — the processor has a warranty, the motherboard has a separate warranty, and so on. Pre-built is simpler; custom build requires tracking multiple warranties but often covers longer periods per component.
Can I return parts if they don't work together?
Most retailers allow returns within 15 to 30 days if the part is unopened or unused. Once you install a component, it's usually non-returnable. Research compatibility before you buy to avoid this problem. PCPartPicker and similar sites flag incompatibilities automatically.
How much time does it actually take to build a PC?
A first build typically takes 2 to 4 hours if you follow a guide and take your time. Subsequent builds take 1 to 2 hours. If something goes wrong — a part doesn't fit, something doesn't power on — add another 1 to 3 hours for troubleshooting.