Medical Office Build-Out: Cost, Timeline, and Code Requirements
What a medical office build-out actually costs in 2026, how long it takes, and the code, ADA, plumbing, and HVAC requirements that drive the budget.
Medical office build-outs (sometimes called medical TI or MOB fit-outs) are one of the most specialized categories of commercial construction. They cost more than standard office TI, take longer than retail TI, and require code expertise most general contractors do not have. This guide gives you the 2026 numbers and the design decisions that drive them.
What Counts as a Medical Office Build-Out
A medical office build-out (MOB build-out) is the interior finish of leased or owner-occupied space for clinical use: primary care, specialty practices, dental, dermatology, urgent care, imaging, infusion, and small-scale ambulatory procedure space. It does not include hospital licensed space, ambulatory surgery centers requiring state agency review, or freestanding ED.
2026 Medical Office Build-Out Cost
| Scope | Typical PSF (2026) |
|---|---|
| Vanilla shell → primary care fit-out | $250 – $375 |
| Specialty practice (derm, ENT, etc.) | $325 – $475 |
| Dental practice with plumbed ops | $350 – $525 |
| Imaging (X-ray, fluoroscopy) with lead shielding | $425 – $625 |
| Infusion suite | $400 – $575 |
| Class B office converted to medical | Add 25–40% vs. fresh shell |
What's included: GC fee, general conditions, insurance, bonds, all subcontractor scope. Not included: medical equipment, owner-supplied casework, IT, security, signage, design fees.
What Drives the Number
Plumbing density
Every exam room with a hand sink, every dental op with chair plumbing, every break room and lab area adds wet wall. Plumbing is often the single largest delta vs. standard office TI.
HVAC and air quality
Medical use often requires increased outdoor air, exhaust at procedure rooms, and pressure relationships between rooms. ASHRAE 170 governs where it applies. RTU sizing and ductwork are typically larger than the base building was designed for.
Electrical capacity
Imaging, sterilizers, autoclaves, and equipment loads frequently require switchgear or panel upgrades at the suite or building level.
ADA and accessibility
Exam rooms, restrooms, and patient pathways must meet 2010 ADA Standards plus state accessibility code (CA Title 24 in California, etc.). Existing buildings often need significant upgrades to meet ADA path-of-travel triggers.
Code triggers
A "change of use" from Class B office to medical can trigger fire-sprinkler upgrades, occupancy load recalc, and energy-code-driven envelope work. Identify these in preconstruction or they will surface during plan check.
Imaging shielding
Lead-lined gypsum or doors for X-ray rooms is a physicist-designed scope. Costs vary by modality, mA, and adjacent occupancies.
Medical Office Build-Out Timeline
| Phase | Typical duration |
|---|---|
| Preconstruction & design | 8 – 16 weeks |
| Permitting | 4 – 12 weeks (AHJ-dependent) |
| Construction | 10 – 20 weeks |
| Inspections & closeout | 2 – 3 weeks |
| Total | 6 – 12 months |
Conversions from non-medical use, suites with imaging, and projects in slow plan-check jurisdictions trend toward the upper end.
Where Owners Lose Money
- Signing a lease before AHJ feasibility — discovering the building cannot accept the MEP scope you need.
- Selecting equipment after design instead of during DD — forcing redesign and re-permit.
- Choosing a GC without medical experience — RFIs and change orders eat the savings.
- Underestimating long-lead equipment (switchgear, sterilizers, custom casework).
Where Owners Save Money
- Standardize exam room layouts across the suite.
- Lock equipment selections during DD.
- Use design-build to compress design + construction by 15–25%.
- Pre-negotiate landlord work-letter scope vs. tenant scope before lease execution.
Related Reading
- Healthcare construction project management
- Healthcare compliance for commercial construction
- Tenant improvements 101
Get a Medical Office Build-Out Estimate
We have delivered medical TI across primary care, specialty, imaging, infusion, and dental for owners and tenants throughout the Western U.S. Request a feasibility review — we will return a defensible PSF range and schedule with AHJ assumptions documented.