Case Study — Healthcare
Hospital Emergency Department Electrical Estimate — Houston, TX
Project Overview
Complete electrical estimate for a 65,000 sq ft emergency department expansion within an existing Level I trauma center. The project required 4 distinct construction phases over 28 months to maintain continuous ED operations. Scope included: new 2500A service from CenterPoint, (2) 1000kVA transformers, (4) 500kW emergency generators with paralleling gear, redundant UPS systems for life safety and critical branch circuits per NFPA 99, complete nurse call system, code-blue notification integration, trauma room imaging power conditioning, and 100% diesel-fueled backup for the entire ED wing.
CSI MasterFormat Divisions Covered
26 05 00, 26 05 13, 26 05 33, 26 05 19, 26 08 00, 26 09 43, 26 09 63, 26 22 00, 26 24 00, 26 27 26, 26 32 00, 26 51 00, 27 15 00, 28 31 00, 28 46 00
Estimating Challenges
- Phased construction in an occupied, fully operational ED required 12 separate electrical shutdown windows — each with a 4-hour max downtime constraint
- Existing building electrical drawings were 22 years old and did not match field conditions — we performed 3 onsite surveys to verify feeder routing and panel loading before the takeoff
- NFPA 99 2021 edition compliance required separate transfer switches for life safety, critical, and equipment branches — the design showed only (2) ATS units, requiring a ($52,000) add for the third ATS
- Medical imaging equipment (CT, X-ray, MRI) had electrical requirements that changed between the schematic design and construction document phases — required requoting (2) 225kVA isolation transformers
Change Order Prevention
During the takeoff review process, our team identified the following scope gaps that would have become change orders if not caught at the estimating stage:
- Identified that the existing ED panelboard had zero spare capacity for the tie-in — required a new 400A distribution panelboard for the transition — ($18,000)
- Caught missing isolated ground receptacle requirements for 12 critical care trauma room headwalls per NEC 517.13 — ($8,400)
- Flagged the generator day tank fill line routing that conflicted with the existing medical gas main — relocation in the estimate prevented $14,000 in field rework
Labor Forecasting
Applied a 35% productivity reduction for work in occupied clinical areas (infection control containment, noise constraints, off-hours work). Phase 1 (shell only) was rated at standard productivity. Phases 2-4 required night-shift work at 1.5x base labor rates for 60% of the electrical workforce. Total labor allowance included $128,000 for infection control containment (temporary barriers, HEPA filtration negative air, and daily cleanup).
Material Escalation Strategy
Generator lead time was 26 weeks with 6% price protection. Recommended and included a firm-price PO for the three ATS units within 2 weeks of award — supplier honored original quote. The medical linear accelerator (not in our scope but coordinated with) required a separate 750kVA isolation transformer with 22-week lead time that was not captured in the main electrical schedule — flagged this to the GC, saving schedule delay.
Budget Comparison
| Line Item | Initial Estimate | Final Bid | Variance |
|---|---|---|---|
| Service & Distribution | $485,000 | $512,000 | +5.6% |
| Emergency Power Systems | $890,000 | $942,000 | +5.8% |
| Life Safety Systems | $340,000 | $364,000 | +7.1% |
| Lighting & Controls | $312,000 | $324,000 | +3.8% |
| Nurse Call & Code Systems | $178,000 | $186,000 | +4.5% |
| Labor (with phasing premium) | $895,000 | $976,000 | +9.1% |
| Total | $2,868,000 | $3,084,000 | +7.5% |
Risk Mitigation
Prepared a detailed shutdown sequencing plan with each of the 12 electrical shutdown windows documented with feeder loads, alternate feed paths, and battery backup verification. Advised pre-installing temporary feeders during Phase 1 to serve Phase 3 equipment before the main switchboard was online. This eliminated an 8-week gap where the new equipment would have been installed but non-operational.
Result
Project awarded at $3.25M (including owner contingency). Our estimate accuracy on material quantities was within 2.1% of actual installed quantities. The phased shutdown plan was executed without a single unplanned outage — all 12 shutdown windows completed within the 4-hour constraint. The contractor reported zero electrical change orders attributed to scope omissions from the estimate.