How to Calculate Monthly Running Costs for Custom PC Building Services
Custom PC Building Running Costs
Running a Custom PC Building service requires significant upfront capital expenditure ($77,000 total CAPEX in 2026) but manageable monthly operating expenses Your fixed monthly overhead, including workshop rent ($2,500) and essential software, totals $5,250 When adding the initial 2026 payroll of $13,542/month for 25 full-time equivalents (FTEs), your starting operational running costs are approximately $18,792 per month This guide breaks down the seven core recurring expenses—from inventory management to labor—that founders must budget for With projected 2026 annual revenue of $1,138,000 and an EBITDA of $802,000, the business model shows strong profitability, provided you manage component cost volatility and keep variable expenses like payment processing (25% of revenue) defintely low
7 Operational Expenses to Run Custom PC Building
#
Operating Expense
Expense Category
Description
Min Monthly Amount
Max Monthly Amount
1
Payroll
Labor
Initial 2026 labor costs for 25 FTEs (Lead Tech, Assembly Tech, 05 CS Rep) total $13,542 per month.
$13,542
$13,542
2
Rent
Fixed Overhead
Workshop Rent is a fixed cost of $2,500 monthly, starting January 1, 2026, regardless of production volume.
$2,500
$2,500
3
Component Costs
COGS
Component Costs are the primary COGS, varying significantly by build, starting around $100 for a budget system in 2026.
$0
$0
4
Software Fees
Fixed Overhead
Monthly fixed costs for Software Subscriptions ($750) and Website/E-commerce Platform Fees ($400) total $1,150.
$1,150
$1,150
5
Transaction Fees
Variable Cost
Payment Processing Fees start at 25% of revenue in 2026, decreasing to 20% by 2030 as volume scales.
$0
$0
6
Utilities & Supplies
Fixed Overhead
Fixed monthly expenses cover Utilities ($600) and Office Supplies ($200), totaling $800 for basic operations.
$800
$800
7
Accounting & Legal
Fixed Overhead
Budget $500 monthly for Accounting & Legal Services, plus $300 for mandatory Business Insurance coverage.
$800
$800
Total
All Operating Expenses
$18,792
$18,792
What is the total monthly operating budget required to sustain Custom PC Building operations?
Fixed costs set the minimum revenue needed just to keep the lights on.
Estimate monthly rent and utilities at $6,000 for a small workshop space.
Salaries for essential staff, assuming two builders, run about $9,000 monthly.
You must cover this $15,000 floor before making a dime of profit, defintely.
Variable Cost Impact
Variable costs scale with every sale you make.
The target payment processing fee is a steep 25% of revenue in 2026.
If you hit $80,000 in monthly sales, that fee alone costs you $20,000.
This means your margin on top of component cost is heavily eroded by transaction fees.
Which cost category—labor, rent, or components—will represent the largest recurring expense?
Labor costs, specifically the fully loaded payroll for assembly technicians, will likely become the largest recurring expense when scaling significantly, outpacing component inventory holding costs which fluctuate with sales volume.
Payroll Scaling Risk
Adding 10 full-time employees (FTE) technicians in 2028 adds substantial fixed overhead to your operating budget.
Assume an average fully loaded cost (salary, benefits, taxes) of $85,000 per technician annually for planning purposes.
This single headcount decision adds $850,000 in fixed annual payroll expense that must be covered regardless of immediate order flow.
This is a major lever to consider when planning your growth strategy; Have You Considered The Best Ways To Launch Custom Pc Building Business?
Component Cost Volatility
Component costs are Cost of Goods Sold (COGS), variable to sales, but holding inventory incurs major risk.
If your average component shelf life before obsolescence is 9 months, holding $500,000 in stock means high capital lockup.
Obsolescence write-downs on high-tech parts (like CPUs or GPUs) can defintely hit 15% annually in a fast-moving market.
Holding costs like storage and insurance can easily add another 10% to the inventory value before a sale is even made.
How many months of cash runway are needed to cover $188k monthly running costs before positive cash flow?
You need enough capital to cover about 6.4 months of operations based on your $188,000 monthly running costs before achieving positive cash flow, which is why securing the total required funding of $1,202,000 by January 2026 is critical for your Custom PC Building service; founders often look at this calculation when planning for How Much Does The Owner Of Custom Pc Building Make?. This runway calculation assumes your operating costs remain steady at $188k while you scale sales volume.
Burn Rate Coverage
Runway is total capital divided by monthly burn rate.
$1,202,000 divided by $188,000 equals 6.39 months.
This is the time you have to build sales volume.
Your burn rate is your net negative cash flow per month.
Total Capital Target
The $1,202,000 covers initial CAPEX and working capital needs.
This ensures you fund component inventory before client payments clear.
If client onboarding takes longer than planned, this runway shrinks defintely.
You must hit cash flow positive by month seven to avoid needing more capital.
If sales volume drops below the 510 units/year forecast, how will fixed costs be covered?
If sales volume for the Custom PC Building service drops below 510 units annually, covering the $63,000 yearly fixed cost requires immediate action on discretionary spending, which is a key consideration when evaluating Is Custom PC Building Profitable In The Current Market?. The primary lever is identifying which operational expenses tied to the $5,250 monthly overhead can be paused or negotiated down until unit sales recover above the break-even point.
Pinpoint Fixed Cost Levers
Review marketing contracts for month-to-month flexibility.
Negotiate payment terms on facility leases if possible.
Defer capital expenditures, like new assembly tools, until Q3.
Covering Monthly Shortfalls
Monthly break-even needs about 14 builds to cover $5,250 overhead.
This assumes an average contribution margin per unit after component costs.
If sales hit 35 units monthly instead of 42.5 (510/12), the shortfall is immediate.
If onboarding takes 14+ days, churn risk rises defintely.
Key Takeaways
The foundational fixed monthly overhead, excluding payroll, for essential services like rent and software subscriptions totals $5,250.
When factoring in the initial 25 FTE payroll, the total starting operational running cost for the Custom PC Building service is approximately $18,792 per month.
The business model demonstrates high projected profitability, targeting an EBITDA of $802,000 in 2026 against $1,138,000 in projected annual revenue.
Founders must prioritize managing component costs, which are the primary variable expense, while also securing a minimum cash requirement of $1,202,000 to cover initial CAPEX and working capital needs.
Running Cost 1
: Staff Payroll
Initial Labor Burn
Your starting monthly labor expense for 25 full-time employees (FTEs) in 2026 is precisely $13,542. This fixed cost covers the core team structure, including Lead Techs, Assembly Techs, and 05 CS Reps, and must be covered every month regardless of sales volume.
Payroll Inputs
This $13,542 figure is based on the required headcount mix needed to handle initial custom PC assembly and support volume. You need firm quotes for the loaded cost per employee—that’s salary plus employer taxes and benefits—to validate this estimate. This is your largest fixed operating expense, dwarfing the $2,500 rent.
Headcount: 25 FTEs total
Key Roles: Lead Tech, Assembly Techs
Support Staff: 5 CS Reps
Managing Headcount Cost
Managing this fixed labor cost means prioritizing efficiency in early builds. Avoid hiring specialized staff until volume justifies it; cross-train Assembly Techs to handle basic support tasks defintely. Don't let the 25 FTEs sit idle waiting for component delivery, which kills margin fast.
Stagger hiring past the initial 25.
Ensure high utilization rates immediately.
Use contractors for one-off project spikes.
Payroll Context
When you look at your $1,150 in monthly software fees and $800 for utilities, payroll alone consumes over 75% of your non-COGS fixed overhead budget. You need high-margin sales just to cover the staff required to build the product.
Running Cost 2
: Facility Rent
Fixed Workshop Overhead
Workshop Rent sets a baseline fixed cost of $2,500 monthly, beginning January 1, 2026. This expense applies whether you assemble zero builds or hit peak capacity, so it directly impacts your break-even calculation from day one.
Cost Inputs and Budget Role
This $2,500 covers the dedicated workshop space for component staging and final system assembly. To verify this, check the lease start date, which is January 1, 2026, against your initial operating expense projections. It defintely impacts your minimum monthly revenue target.
Lease agreement start date
Agreed monthly rental rate
Fixed nature impacts contribution margin analysis
Managing Fixed Space Costs
Because this cost is fixed, efficiency means maximizing the number of builds completed within that space each month. Avoid signing a lease that requires more square footage than your initial 25 FTEs justify. Securing a shorter initial term minimizes risk if volume projections are missed.
Negotiate a rent abatement period
Ensure utility costs are separate
Avoid signing for space too early
Fixed Cost Impact Calculation
If you only complete 50 builds in a given month, this $2,500 rent adds $50 of required fixed cost recovery to every single system sold. This overhead must be covered before you even account for variable component costs or transaction fees.
Running Cost 3
: Component Costs
COGS Variance Drives Profit
Component Costs are your primary Cost of Goods Sold (COGS), meaning they are the biggest variable expense tied directly to what you sell. Since every custom PC build differs, your COGS fluctuates with every order. This reality means profitability hinges entirely on accurate sourcing and pricing for each specific configuration.
Inputs for Component Cost
This cost covers all physical parts—CPUs, GPUs, RAM, cases, and storage—needed to assemble the final system. To estimate this, you must finalize the Bill of Materials (BOM) for each tier. For instance, the lowest tier, the Budget Office System, has component costs starting at $100 in 2026. This cost directly reduces gross margin before overhead hits.
Finalize BOM per build tier.
Track actual component purchase prices.
Calculate minimum viable cost baseline.
Controlling Component Spend
Managing component costs requires disciplined procurement, not just cutting corners on quality. Negotiate bulk pricing with distributors based on projected yearly volume targets. Avoid scope creep on initial designs, as unexpected changes lead to wasted inventory and assembly delays. Also, ensure your assembly techs don't cause damage, which forces costly component replacement.
Negotiate volume pricing early on.
Standardize core components across tiers.
Minimize inventory obsolescence risk.
Cost Variance Impact
The variance in component cost between a $100 entry-level build and a high-end workstation dictates your required Average Order Value (AOV) to cover fixed costs like the $13,542 monthly payroll. Precision in tracking the materials cost for every SKU is defintely non-negotiable for achieving positive unit economics.
Running Cost 4
: Software Fees
Fixed Software Total
Your fixed monthly software costs, covering subscriptions and the e-commerce platform, total $1,150. This expense is non-negotiable overhead that must be covered every month before you see profit from your custom PC builds.
Cost Inputs
This $1,150 is pure fixed overhead, separate from variable component costs. It covers $750 for essential software subscriptions and $400 for the website/e-commerce platform needed to take orders. Budget this amount monthly starting January 2026, regardless of sales volume.
Software Subscriptions: $750
Website Platform Fees: $400
Total Fixed Software: $1,150
Cost Control
Review all software subscriptions annually; many grant savings if you commit yearly instead of monthly. For the e-commerce platform, ensure your selected tier matches your current transaction volume; paying for capacity you don’t use is wasted cash. You should defintely audit licenses quarterly.
Seek annual prepayment discounts.
Downgrade platform tiers if volume dips.
Audit unused licenses quarterly.
Margin Pressure
Since this $1,150 is fixed, it immediately pressures your gross margin per unit. If your average gross profit per system is $1,000 after parts and labor, you must sell 1.15 systems monthly just to break even on software fees alone.
Running Cost 5
: Transaction Fees
Transaction Fee Impact
Payment processing fees are a major variable cost, starting at 25% of gross revenue in 2026 for your custom PC sales. As sales volume increases over the next few years, this cost should drop to 20% by 2030. That 5-point reduction is critical for margin improvement.
Inputs for Fee Calculation
These fees cover accepting customer payments for your high-ticket custom builds, like a $3,500 gaming rig. You calculate this cost using Total Revenue Ă— Fee Percentage. Since Component Costs are your main COGS (Cost of Goods Sold), this initial 25% fee immediately pressures your gross margin before overhead hits.
Managing Processing Costs
Reducing this cost means negotiating better merchant rates as volume grows past initial hurdles. For high-value transactions typical in custom PC sales, look into alternative payment rails or invoicing methods for B2B clients. Avoid relying solely on standard credit card processors for every transaction.
Pricing for Early Fees
Because the fee scales down from 25% to 20% based on volume, your initial pricing must aggressively absorb that high 2026 rate. If your average system price is $3,000, that initial 25% fee eats $750 per unit before you even cover parts or payroll. This defintely impacts early profitability goals.
Running Cost 6
: Utilities & Supplies
Utilities & Supplies Baseline
Fixed monthly expenses for Utilities ($600) and Office Supplies ($200) total $800 for basic operations. This cost hits your bottom line every month, whether you ship zero builds or hit peak assembly capacity.
What This Cost Covers
This $800 covers essential workshop Utilities at $600 and Office Supplies at $200. Think electricity for assembly stations and consumables like thermal paste applicators or cleaning kits. It’s part of your baseline fixed overhead, separate from variable component costs.
Utilities: $600 fixed monthly.
Supplies: $200 fixed monthly.
Total fixed overhead: $800.
Managing Supply Spend
Since utilities are mostly fixed, optimization means efficiency, not deep cuts. For supplies, avoid overstocking expensive items like specialized anti-static mats. Track supply use per build to defintely catch waste; aim to keep supply costs under 1% of component COGS if possible.
Audit utility usage quarterly.
Buy supplies in bulk only if storage is cheap.
Don't let assembly techs hoard expensive consumables.
Overhead Context
At $800, this cost is small compared to your $13,542 payroll, but it’s 100% unavoidable operating expense. You need this running to even open the door for the first custom PC build. It must be covered before component costs are even calculated.
Running Cost 7
: Accounting & Legal
Mandatory Compliance Budget
You need to earmark $800 per month for essential compliance and protection costs right now. This covers your external accounting help plus the required business insurance policy to shield the operation. Don't let compliance slip; it’s a non-negotiable fixed overhead for your custom PC business.
Cost Breakdown
Set aside $500 monthly for external accounting support, like bookkeeping and tax prep. Add $300 for mandatory business insurance coverage. This $800 fixed cost is small compared to payroll ($13,542) but must be paid regardless of how many custom PCs you sell.
Accounting Services: $500/month
Business Insurance: $300/month
Total Fixed Compliance: $800/month
Managing Overhead
You can control the insurance portion by getting quotes from three brokers annually; aim to keep that $300 stable. For accounting, use a fractional CPA until revenue hits maybe $150k monthly, then hire full-time. Don't skimp on audit defense; that’s how you get burned defintely.
Benchmark insurance rates yearly
Use fractional support early on
Keep records clean to lower CPA time
Risk Mitigation
Compliance costs are low leverage but high risk if ignored for your custom PC builds. If you skip the $300 insurance premium, one major liability claim from a component failure could bankrupt the whole operation. This budget item is pure downside protection.
