When in the basement project should the electrician come?

Twice. Once for rough-in (after framing, before insulation/drywall) and once for trim (after drywall and paint). The rough is the bigger visit.

Do I need a sub-panel in the basement?

Often, yes — especially if the main panel is on the opposite side of the house. A sub-panel keeps wire runs short and makes future changes easier.

Can I run my own wires and have you connect them?

No. The licensed electrician owns the work for the permit and inspection. We can’t certify what we didn’t install.

How long does the electrical take?

Rough-in typically 2–4 days for a full basement. Trim-out 1–2 days. Spread across the GC schedule.

Before Finishing a Basement | Long Island Electrical Planning Guide

01

Who this is for

Homeowners planning to finish a basement in the next 6–12 months
Anyone working with a GC who needs the electrical scope nailed down
Long Island homeowners adding a bath, mini split, or in-law suite downstairs

02

What you should know first

Lock floor plan decisions first

Before any wiring is roughed in, you need to know room divisions, TV wall locations, bar/kitchenette locations, mini split or hot tub spots, and laundry. Changing your mind after rough-in means tearing out work.

Outlets, lighting, bath, office, TV, mini split, gym

Each of these has its own code requirement and circuit count. A basement with a TV wall, mini split, bar fridge, and bathroom can easily need 6+ new circuits.

Future-proofing

Add Cat6 to office and TV walls. Run a smart switch neutral to every switch box (cheap now, mandatory if you ever add smart switches). Run a spare conduit from panel to attic if there’s any chance of solar or future loads.

Permit stages

Long Island towns require an electrical permit, a rough inspection BEFORE drywall, and a final inspection after trim. Skipping the rough means walls get reopened — non-negotiable.

What gets expensive to add later

Anything inside a wall: outlets, dedicated circuits, smart-switch neutrals, in-wall TV power, bath fan venting, recessed lights. If you’re even 60% sure you want it, add it now.

03

Common mistakes to avoid

The patterns we fix most often. Skip these and you’re ahead of most homeowners.

Skipping the rough inspection (then having to reopen walls)
Forgetting the bathroom GFCI / vent fan circuit until trim
One zone of recessed lights for the whole basement (it’ll feel like a parking garage)
No dedicated circuit for the TV wall
No exterior weatherproof outlet at the basement walkout
Underestimating the panel load — every basement needs a load calc

04

What affects cost

Number of circuits added (each one = labor + breaker + wire)
Bath fixture count (vent fan, GFCI, lights, possibly heat)
Recessed lighting count + zones
Mini split power feed
Whether your panel can take all the new loads or needs a sub-panel
Permit fees and inspections (vary by town)

05

What the process usually looks like

01Walkthrough + sketch the floor plan with you
02Written electrical scope coordinated with your GC
03Permit pulled with your town
04Rough-in: all wiring run before insulation/drywall
05Rough inspection passed
06Trim-out after drywall: outlets, switches, fixtures
07Final inspection

Quick self-check

Is this project right for you?

Three quick yes/no questions. Answer honestly — you’ll get a straight read in under a minute.

1. Is your floor plan finalized (rooms, TV wall, bath, bar)?

2. Has your panel capacity been reviewed for the new loads?

3. Are you working with a GC or coordinating subs yourself?

06

Quick checklist before hiring

Download the PDF checklist

Basement Electrical Planning Checklist · PDF · Free

Floor plan locked (no ‘we’ll figure it out later’)
Panel reviewed for capacity (load calculation done)
Written scope from electrician with circuit counts
Permit + both inspections included in price
Coordination plan with GC / drywall / HVAC

07

Frequently asked questions

Next step

Need help figuring out your next step?

If you’re planning electrical work and want clear advice before moving forward, reach out. We’ll help you understand what makes sense, what to avoid, and what your options are.

Get a basement electrical planning visit Text floor plan photos to 516-361-4068

Keep reading

Before Finishing a Basement