Planning a commercial tenant improvement in Phoenix AZ? Here’s the honest breakdown on permit timelines, TI costs, HVAC sizing, and getting your certificate of occupancy.
Quick answer: A commercial tenant improvement (TI) build-out in Phoenix AZ typically takes 3 to 7 months from lease signing to certificate of occupancy. Budget $65 to $165 per square foot for a standard office or retail TI, depending on scope and finish level.
Tenant in Scottsdale signed a lease on 8,400 square feet last October. Medical office use. Full gut, new MEP, ADA-compliant restrooms, exam rooms, and a waiting area with high-end finishes. They told their landlord they’d be open by February. They weren’t. Not because the contractor was slow. Because the permitting, the design coordination, and the lead times for specialty equipment all landed harder than the tenant’s broker warned them.
Here’s the honest breakdown of what commercial TI in Phoenix actually looks like from a builder’s desk.
What TI Scope Covers (and What It Doesn’t)
Tenant improvement is the work you do to convert a raw shell or previously tenanted space into something your business can operate from. That includes interior walls, ceilings, flooring, HVAC for your occupancy type, electrical, plumbing, data and telecom rough-in, restrooms, and finishes.
What TI doesn’t cover: the base building systems (existing roof, structure, exterior, core restrooms in a multi-tenant building, base HVAC if the landlord provides it). The lease spells out the demarcation line. In a cold-dark shell, the tenant pays for everything inside the unit. In a warm vanilla shell, the landlord has done the basic HVAC, electrical panel, and restroom rough-in, and the tenant takes it from there. Know which one you’re walking into before you budget.
| Space type | What landlord typically provides | What tenant TI covers |
|---|---|---|
| Cold-dark shell | Structure, roof, exterior only | Everything inside: MEP, ceilings, walls, finishes |
| Warm vanilla shell | HVAC units, electrical panel, basic restrooms | Interior layout, finishes, specialty systems |
| Second-generation space | Previous tenant’s build-out, as-is | Demo, modification, and new finishes |
| Full floor, Class A office | Core restrooms, lobby, HVAC main | Your suite’s interior fit-out only |
Phoenix Building Permit Timelines for Commercial TI
City of Phoenix commercial permit review runs 4 to 8 weeks for a standard TI. Scottsdale is similar. Tempe and Mesa run 5 to 10 weeks. Projects with medical or food service occupancy, or anything requiring fire suppression modifications, can push to 12 to 16 weeks. Those timelines are for first submittal when the drawings are complete. An incomplete set that comes back with city comments adds 2 to 4 weeks per resubmittal cycle.
The smart play: get a preliminary meeting with the city’s plan review team before you finalize the permit set. Phoenix offers pre-application conferences for commercial projects. It takes a week to schedule and costs nothing. The feedback often saves 6 weeks of plan-check ping-pong. Most tenants skip this step. The ones who’ve been through a messy TI before don’t.
Budget Planning for a Phoenix TI Project
Standard office TI in the Phoenix metro in 2026 runs $65 to $100 per square foot for a functional-but-not-fancy build-out. Legal or financial offices wanting quality finishes: $100 to $135. Medical, dental, or life sciences: $120 to $165 because of the MEP density (plumbing at every exam room, specialty electrical, medical gas in some cases). High-end retail with custom millwork and specialty lighting: $130 to $180.
The landlord TI allowance (often $40 to $80 per square foot in Phoenix right now for well-located space) offsets the tenant’s cost but rarely covers the full build-out. The difference is on the tenant. Factor in soft costs too: architect, structural engineer if needed, permit fees (typically 1.5 to 3 percent of construction cost), and furniture that you’ll want coordinated with the build-out timeline.
- Standard office TI: $65–$100/sq ft
- Professional services (law, finance): $100–$135/sq ft
- Medical or dental: $120–$165/sq ft
- High-end retail with custom millwork: $130–$180/sq ft
- Soft costs (design, permits): 12–18% of construction cost
- Typical landlord allowance in Phoenix: $40–$80/sq ft
HVAC and Mechanical in Arizona Heat
This is the line item that surprises tenants coming from other markets. Phoenix’s design cooling load is higher than almost anywhere else in the country. A properly engineered HVAC system for a 5,000 square foot medical office in Tempe runs $80,000 to $130,000 for equipment and install. For a standard office of the same size: $45,000 to $75,000. These aren’t numbers to cut corners on. An undersized system costs more to run every month for the life of the lease.
If the landlord provides base HVAC units in a warm vanilla shell, those units may not be sized for your occupancy density. A call center with 60 people in 4,000 square feet has a different heat load than a law office with 10. Get the HVAC engineering done as part of the design, not as an afterthought during construction.
Working in Occupied vs Vacant Spaces
A second-generation space with a previous tenant’s build-out already in place is usually faster than a cold-dark shell. The MEP rough-in may be reusable. But it’s not always a win. If the previous tenant’s HVAC was undersized or the electrical doesn’t match your load, you’re demoing and re-running anyway. A thorough existing-conditions survey before you sign the lease is worth the $3,000 to $6,000 it costs.
If the adjacent space in your building is occupied during your TI, there are noise, vibration, and access constraints. Demo and concrete cutting typically go to a weekend or after-hours schedule for occupied buildings. That adds time and cost. Know this before you set your opening date.
Certificate of Occupancy in Arizona: The Last Mile
The certificate of occupancy (COO) is the city’s sign-off that the space is safe to occupy for its intended use. Final inspection in Phoenix commercial takes 1 to 3 weeks after the contractor calls for it. The inspector checks that everything was built to the permit drawings: fire life safety, ADA compliance, electrical, plumbing. Any outstanding items come back as a correction list. There may be two or three rounds of corrections on a complex TI.
The practical advice: don’t sign a lease that sets your rent start date 2 weeks after permit approval. That doesn’t account for inspection time or corrections. Most experienced tenants negotiate a rent commencement date tied to COO issuance, with a landlord-agreed outside date. If commercial tenant improvement in Phoenix is on your radar, JAG Development handles TI work across Nevada and Arizona with licensed teams on both sides of the state line. For a broader look at JAG’s commercial construction scope, that page covers ground-up, tilt-up, and tenant improvement work.
Commercial TI in Phoenix is competitive and moves fast. The tenants who hit their opening dates are the ones who started permitting before they were ready to build, ordered long-lead items before they were ready to buy, and built a schedule that accounted for the city’s review clock, not an optimistic broker’s projection.
Learn more about commercial construction in Arizona and how our division approaches build-outs across the Phoenix market.
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