At RKM Homes, electrical work is not a single punch list item but a sequence of coordinated steps that runs throughout the build. Because we design and construct custom homes on a client’s lot in the Denver area, the electrical timeline begins in the design and permitting phase—where load calculations, panel sizing, lighting plans and special systems (EV chargers, heated driveways, home automation) are determined—and continues through rough‑in, inspections, service connection and final trim. Each step depends on framing, insulation and finish schedules, as well as local building‑department and utility timelines that vary seasonally.
Typical timing you can expect: design and permit review usually takes a few weeks to a couple of months depending on plan complexity and municipal backlog; electrical rough‑in generally occurs immediately after framing and can take 1–3 weeks for an average custom home; the required pre‑drywall electrical inspection is scheduled after rough‑in and can add days to a few weeks depending on inspector availability; the utility service drop or meter installation often requires separate coordination and can take one to several weeks after approval; final trim work—installation of switches, outlets, fixtures and commissioning—happens after drywall, painting and cabinetry and typically takes a few days to a week. Larger homes, specialty systems and long‑lead fixtures can extend these windows.
To keep the timeline tight, make electrical decisions early and prioritize ordering any custom lighting, specialty panels, EV chargers and smart‑home gear during schematic design so lead times don’t delay final trim. Coordinating with other trades is critical—rough‑in must be completed before insulation and drywall, and finishes should be staged so electricians have clear access for final wiring. At RKM Homes we manage those handoffs and communication with local inspectors and utility providers so electrical milestones align with your overall construction schedule and your move‑in date.
How are electrical loads calculated and the electrical system designed for my new custom home?
We start electrical design during the schematic design phase — long before drywall goes up — because accurate load calculations drive service size, panel locations, and circuit planning. A preliminary load estimate can be done in a few days from a basic appliance and HVAC list; a full, stamped electrical plan with circuit schedules and panel layouts typically takes 1–3 weeks depending on complexity. Finalizing this design early prevents costly change orders later and gives you a clear budget line for the electrical scope.
To make the process smooth and accurate, gather manufacturer spec sheets and amperage requirements for every major appliance and system you plan to install: range, wall ovens, HVAC units (including heat pumps), water heaters, EV chargers, hot tubs, workshop tools, and whole‑house battery/solar gear if you expect it. Tell us about anticipated future loads (EVs, battery backup, EV charging in a garage converted later) so we can include spare capacity and conduit runs now — it’s much cheaper to provision for them in the initial design than to retrofit later.
The load calculation results drive practical decisions you’ll see on the plans: whether a 200A service is sufficient or a 400A service is warranted, how many subpanels or dedicated circuits you’ll need, and where to reserve spare breakers or conduit for future expansion. From a homeowner’s standpoint, expect to budget a modest design fee for the electrician, review the plan with us so panel locations match your layout and furniture plan, and approve the final electrical schedule before construction documents are issued to avoid delays and additional cost.
What permits, code requirements, and inspections are needed for electrical work during new home construction?
As a custom home builder in Denver, we treat the permitting step as the gatekeeper for the electrical timeline. Most jurisdictions require an electrical permit and plan review before any wiring begins; your electrical contractor should submit a site plan, single‑line diagram, panel schedules and load calculations with the permit application. The work is evaluated against the current National Electrical Code plus local amendments — anything from service sizing to GFCI/AFCI placement can trigger plan review comments. Homeowners can speed this up by making sure the builder/electrician provides complete, stamped documents at submission and by paying attention to plan review fees and expected turnaround times published by the local building department.
Key inspection milestones that affect schedule are the plan review approval, the rough‑in inspection (before insulation/drywall), the meter/service inspection (before the utility will set the meter), and the final electrical inspection after devices and panels are installed. Expect inspectors to require the approved plans posted on site and to verify that work matches the submitted drawings. We recommend homeowners ask their electrician to prepare a simple inspection checklist tied to each milestone so you can confirm the same items the inspector will look at — box fill, conductor sizing, grounding, proper device locations, and labeling — which reduces the chance of failed inspections and costly rework.
Permitting and inspections commonly create the largest schedule variance on the electrical side, so plan for extra time and budget. Typical plan review windows vary by jurisdiction and complexity; allow several weeks for review and at least a few days to a week to schedule each inspection (longer during busy seasons). If an inspection fails, repairs and reinspection fees can add days or weeks, so insist on quality work up front: choose a licensed electrician with a good track record in your city, request pre‑inspection walk‑throughs with the inspector when possible, and build contingency days into your construction timeline to absorb any permit or reinspection delays.
When should rough‑in electrical wiring be scheduled relative to framing, plumbing, and HVAC work?
We schedule rough‑in after the shell is framed, sheathed, and the roof is on so walls and ceilings are open but before insulation or drywall. For a typical 2,500–3,500 sq ft custom home that means electricians are usually on site 1–2 weeks after framing completion; the crew will generally need 2–5 working days depending on home complexity and the amount of low‑vol/structured wiring. Clear attic, crawlspace, and garage access are critical—if attic access, HVAC ductwork or plumbing stacks are blocked the crew can’t complete runs and you’ll see delays.
Coordination with plumbing and HVAC is best handled as a single rough‑in phase rather than isolated trades. We bring the electrician, plumber, and HVAC techs together for a pre‑rough walkthrough to mark chase locations, ceiling fixture heights, return and vent clearances, and equipment placements so wires, pipes and ducts don’t conflict inside the same bays. Run all low‑vol systems (network, security, speakers, doorbell, EV charger conduit) during this window so you avoid fishing wires later.
Homeowners should finalize and provide critical decisions before that walkthrough: exact locations for outlets, dimmers, switches, appliance circuits (cooktop, wall ovens, EV charger, hot tub), ceiling fan boxes and fixture weights, thermostat and zone control locations, and any whole‑house systems. Bring appliance specs and a furniture/layout plan or mark them on the plans so outlets aren’t hidden behind sofas or counters; last‑minute changes at rough‑in are costly and typically add days to the schedule.
When does utility service and meter installation occur, and how is temporary power provided during new home construction?
From our experience building custom homes in Denver, the permanent meter is set only after the service equipment (meter base, service mast or underground service conduit, and main disconnect) is installed and the municipal service/utility inspection is passed. For a straightforward meter set on an already-served street this can be a matter of days to a couple of weeks after you request service; if the job requires a line extension, transformer work, or easement work you should plan for multiple weeks to a few months. Practical step: open an account with your electric provider early (in Denver that’s often Xcel Energy), provide the permit number and site plan, and ask the utility for their estimated lead time so you can lock the schedule.
Temporary construction power is a separate but parallel step we coordinate on every job. We typically arrange a temporary meter/pole or an approved generator and pull the temporary-power permit so subcontractors have reliable, code-compliant power for tools, heaters, and equipment. Make sure you confirm with your builder where the temporary meter will be located — utilities and inspectors need clear access — and insist that all temporary setups be GFCI-protected, labeled, and locked; never allow ad-hoc, unprotected cords or makeshift taps on municipal poles.
There are a few homeowner actions that prevent the most common delays: sign your utility service agreement and pay required deposits promptly, grant any needed easements or right-of-way approvals, keep grading and access points clear for utility trucks, and coordinate inspection windows (utility meter release usually follows the service inspection). If the utility’s schedule is slow and you’re on a tight build timeline, budget for a short-term rental generator as a contingency; that gives you power continuity without forcing schedule changes while you wait for the permanent connection.
What should I expect during final electrical trim, device installation, testing, and commissioning?
We schedule the final electrical trim after interior finishes are essentially complete so switches, outlets and fixtures aren’t damaged during painting or flooring work. For a typical custom home that means this phase usually takes one to three business days; larger homes or those with extensive smart-home systems can take longer or require multiple trips. You’ll want the rooms clear, all light fixtures and cover plates on site, and easy access to the electrical panel and attic so the crew can move quickly — if you provide those things we can usually finish in a single coordinated visit.
During the work we install and adjust all devices (switches, outlets, dimmers, cover plates, and light fixtures), program any connected controls, and run a full commissioning checklist: verify every switch and receptacle is on the correct circuit, test GFCI/AFCI protection and smoke/CO interconnects, take voltage readings at the panel, perform basic load checks on major appliances and the HVAC circuit, and confirm dimmer/LED compatibility and outdoor/low‑voltage lighting operation. We document failures or anomalies on a punch list and correct anything immediate; items that require parts or further trades are scheduled promptly. Expect the electrician to label the panel clearly and leave a checklist of what was tested.
From a homeowner’s practical standpoint, insist on three deliverables before final payment: an accurate, legible panel schedule (as‑built circuit map), a signed commissioning checklist showing tests performed and results, and manufacturer O&M/warranty info for installed devices. Be present for the final walk‑through so you can see device operations and ask to have key circuits demonstrated (kitchen appliances, EV charger, backup generator if applicable). Also ask how to reset GFCIs/AFCIs, who to call for warranty service, and how long response/repair windows are — those small details save time and stress after move‑in.