How to Set Up a Contractor Shop: Electrical, Layout, and What to Ask Your Landlord
You’re an HVAC technician, electrician, plumber, or general contractor. You’ve been running jobs from your garage or home. Now you need a real shop. Space for a work vehicle, tools, parts storage, and a place to meet with clients or handle paperwork.
Here’s what to look for and what to ask your landlord before you sign.
Electrical: What 100-200 Amps Actually Means
Electrical service is the number one constraint in choosing a contractor shop.
What is an amp? Amperage is the rate of electrical flow. A standard residential outlet is 15 amps. Most household circuits are 15 or 20 amps. A home has a 100 to 200 amp main electrical service.
What do contractors need? It depends on your equipment. A basic HVAC technician with hand tools and maybe a small portable air compressor can run on 100 amps. An electrician with a welder or a plumber with a large air compressor needs 200 amps.
100 Amp Service This is residential-scale service. You can run one major tool at a time. If you’re running a compressor and a welder simultaneously, you’ll blow a breaker. A basic shop with hand tools, a small compressor (2 to 5 horsepower), and standard shop equipment works fine. Most HVAC and plumbing shops can live with 100 amps.
Cost: typical industrial service is $100 to $200/SF in power upgrade costs. For a 950-SF unit needing an upgrade from 100 to 200 amps, expect $5,000 to $10,000 and a few weeks of construction. Ask if the landlord will split or cover it.
200 Amp Service Commercial-scale service. You can run multiple heavy tools simultaneously. Two compressors, a welder, and a lift going at the same time, no problem. Electrical contractors, welders, and larger mechanical shops need 200 amps.
Cost: similar to 100-amp service if the building already has it available. You’re just connecting to a panel. If the building only has 100 amps at the main, upgrading to 200 amps involves calling the electrical utility and upgrading the service entrance. That can run $10,000 to $20,000 and take weeks. Avoid spaces where you’d need to upgrade the main service.
Single Phase vs. Three Phase Most small shops run single-phase power (the standard residential service). It’s adequate for most tools. Three-phase power is found in larger industrial buildings and is used for large compressors, CNC machines, and heavy industrial equipment. Unless you’re running a major manufacturing operation, single-phase is fine.
In Practice Before you lease, ask: “What’s the current electrical service? Is it 100 or 200 amps? Single or three phase?” If it’s 100 amps and you need 200, ask the landlord about upgrading. If they won’t budget for it, find another space. Don’t sign a lease expecting to run heavy equipment on service that can’t handle it.
Layout: Zones for Different Functions
A contractor shop needs a few distinct areas.
Vehicle Bay This is where your work truck or van parks. It needs a drive-in door (we covered this in our drive-in door guide). A 12x12 drive-in is standard. The vehicle bay should be sized for your vehicle plus a couple feet on each side for doors to open.
Most contractor bays are 950 to 1,200 SF. A vehicle is typically 6 to 8 feet wide and 15 to 18 feet long. A 950-SF unit (maybe 30x30 or 32x30 roughly) gives you room for the vehicle, tool storage on the walls, and maybe a workbench.
Parts and Materials Storage Shelving along the walls for pipes, copper, wire, refrigerant, or whatever your trade uses. Metal shelving is standard. Estimate 2 to 4 feet of shelving around the perimeter of the bay. It doesn’t take much space, but it needs to be organized and accessible.
Tool Organization Pegboards, tool chests, and wall storage for hand tools. Many contractors use a large tool cabinet (4 feet wide, 2 feet deep, 6 feet tall) for wrenches, screwdrivers, and small equipment. Hang larger tools (saws, drills) on wall-mounted racks.
Don’t underestimate tool storage needs. A well-organized shop is 30 to 40 percent better at productivity than a disorganized one.
Workbench If you assemble equipment, repair parts, or build custom items, you need a workbench. A standard workbench is 4 to 6 feet long, 2 to 3 feet deep, and 30 to 36 inches tall. It bolts to the floor and seats on the bay side of the space. Many contractors also add a vise or clamp to the workbench.
Office Corner This can be minimal: a desk, chair, file cabinet, and phone. If the flex space has an integrated office, great. If not, carve out a corner of the bay for the essentials. You might install a portable office partition (non-permanent wall) to separate the office corner for phone calls and paperwork.
Break Area Small sink and a mini-fridge if there’s room. Nice to have but not essential. Many contractors use a coffee maker and a cooler instead.
What to Ask Your Landlord Before You Sign
Permitted Use and Trade Restrictions Some leases allow “general contractor operations” but exclude welding, blasting, or other noisy or hazardous activities. Know your lease. If you’re an electrician with a portable welder, you need to confirm welding is allowed. If you’re doing plumbing assembly work, you need to confirm that’s okay.
Zoning also matters. Most industrial zoned space (M-1, M-2, I-1 depending on Durham zoning) allows contractor shops. But if the building is zoned for “light manufacturing” or “office warehouse,” some trades might not be permitted. Ask the landlord and verify the zoning yourself on Durham’s city website.
Alterations and Modifications Can you install shelving? Add walls or partitions? Mount equipment to the walls? Most leases allow standard build-outs without permission. But ask before you drill a hole, hang a heavy tool cabinet, or install a workbench that gets bolted to the floor. Get it in writing.
After-Hours Access Do you need to access the shop early morning or late night? Most flex buildings offer 24/7 access for $50 to $150 per month. Some only offer business hours access. Confirm what you need and get it in the lease.
Utilities and Cost What utilities are included in your rent, and what do you pay separately? Most leases include water and trash. You typically pay for electricity separately based on usage. Some leases cap water usage and charge overages. Ask about average monthly utility costs and whether your type of operation (air compressor running all day) will inflate them.
Parking for Work Trucks If you have a work truck, where does it park? In the bay, obviously. But if you have two vehicles or a crew, you need dedicated parking spots in the lot. Get this in writing. Don’t assume spots are available.
Signage Can you put your business name on the building exterior? Some landlords restrict exterior signage for aesthetic reasons or lease conflicts with other tenants. Ask what’s allowed and get it in writing. If you want visibility, this matters.
Liability and Insurance Ask what the landlord requires in terms of business liability insurance. Most ask for $1 million in general liability and naming the landlord as an additional insured. Standard. But verify it’s in the lease terms before you get insurance quotes.
Noise, Fumes, and Hours of Operation Are there restrictions on noise? Some buildings share walls, and noisy operations (welding, grinding) might bother adjacent tenants. Similarly, fumes from certain activities might be restricted. Ask explicitly: “Can I run a compressor, welder, grinder, or other noisy equipment during business hours?” Get clarity.
Zoning and Permits
Durham zoning varies by area. Most flex buildings in South Durham and East Durham are zoned M-1 (light manufacturing) or I-1 (light industrial), which allows contractor operations. RTP area might have different zoning.
Before you lease, verify the zoning on the Durham city website or call the planning department. You want to make sure your trade is permitted. If you’re renting a space and then finding out your use isn’t zoned-compatible, you’re in trouble.
Some contractor uses require trade licenses or certifications (electricians, plumbers, HVAC technicians). Having a licensed shop doesn’t require special zoning, but it’s good practice to keep your licenses current.
Cost and Budget Planning
A 950-SF contractor shop in South Durham costs about $1,750 to $1,900/month all-in ($20/SF base plus $4/SF NNN). That’s $21,000 to $23,000 annually.
Add initial setup costs:
- Shelving and storage: $1,000 to $3,000
- Workbench and tool storage: $1,000 to $2,000
- Office furniture: $500 to $1,500
- Signage: $500 to $2,000
- Any electrical upgrades: $0 if the space already has 200 amps, $5,000+ if you need to upgrade
Total first-year cost (including rent, 12 months): roughly $25,000 to $32,000 for a basic contractor shop. If you’re starting, that’s a real commitment. Make sure the space makes sense before you sign a long lease.
Real Example
You’re an HVAC technician in Durham. You have a van, some hand tools, a portable compressor, and a small welder. You meet with customers occasionally. Here’s your shop setup:
- Flex space: 950 SF with 12x12 drive-in door, 100-amp electrical service ($20/SF base, $4/SF NNN = $1,800/month)
- Vehicle bay: drive-in door and vehicle parking (400 SF)
- Parts storage: copper, aluminum, refrigerant, ductwork (300 SF of shelving)
- Workbench: small bench with vise for minor assembly (50 SF)
- Office: desk, phone, file cabinet (100 SF)
- Break area: coffee maker and cooler (minimal space)
Total occupancy: $1,800/month. Setup cost: under $5,000. You’re in business with a professional location.
That’s the baseline for a contractor shop.
Final Checklist Before You Lease
- Verify trade is permitted in the zoning
- Confirm electrical service is adequate for your equipment (100 or 200 amps)
- Verify drive-in door size fits your vehicle
- Confirm after-hours access if you need it
- Get parking spots specified in the lease
- Clarify what alterations and modifications are allowed
- Verify signage is allowed if you need visibility
- Understand utility costs and what’s included
- Confirm landlord liability and insurance requirements
Get Flex Space buildings in Durham offer contractor-friendly spaces with drive-in doors, adequate electrical, and flexible lease terms. Most are move-in ready in 2 to 4 weeks. Check current Durham availability to find a space that fits your operation.
Additional Resources
FAQ
Do I need a business license to run a shop? It depends on your trade. Some trades (electricians, plumbers, HVAC technicians) require state licensing. Other trades don’t. Check with Durham and North Carolina licensing boards for your specific trade. A business license from the city is separate and usually required regardless of trade.
Can I run a shop on 100 amp service if I’m careful? Technically, yes. But don’t do it. Heavy equipment will trip breakers, killing your productivity and frustrating you. Invest in 200-amp service if you need more than a portable compressor and hand tools.
What if I need to modify the electrical after I lease? Work with the landlord. Most allow electrical upgrades if they’re performed by licensed electricians and permitted properly. Cost and responsibility should be negotiated at lease signing.
How much do I actually need in initial setup? For a basic contractor shop: $2,000 to $5,000 in tools, storage, and furniture. If the space already has electrical and drive-in doors, you’re not spending on construction. Keep it simple the first year and add equipment as you grow.