A commercial tenant improvement rarely costs what the per square foot figure on a broker flyer suggests. The final number is a stack of separate layers, each one set by a different force: the condition of the shell, the state energy code, accessibility law, the fire authority, and the finishes the tenant chooses. In the San Joaquin Valley, where older retail strips and tilt-up warehouses are being turned into clinics, gyms, restaurants and offices, the layers that catch owners off guard are usually the ones nobody can see on a walkthrough.
Reading those layers before a lease is signed is the kind of planning Rose Hill Construction, Inc. builds into every design-build project. The Manteca firm has held a California B general building license since 2014 and focuses on office and retail build-outs, restaurant renovations, warehouse fit-ups, veterinary clinics and ADA upgrades from the Valley to the Bay Area and South Sacramento, with value engineering and open subcontractor pricing so owners can see every line before committing. If a lease or floor plan is on the table, a cost review with their team is a smart first step.
The money spent before demolition
Soft costs arrive first and often total 10 to 20 percent of the budget. They break down into a few distinct pieces.
Design and engineering. Architectural drawings, mechanical, electrical and plumbing engineering, and structural calculations when walls, roof penetrations or heavy equipment are involved.
Plan check and permit fees. Most Valley cities calculate these from project valuation, so a larger scope raises the fee as well as the build cost. Food service and medical uses can add separate county reviews.
Energy compliance documentation. California’s Title 24 Part 6 requires signed compliance forms for lighting, mechanical and envelope work. These are prepared during design, not at the end, and they shape what gets specified.
Skipping careful design to save money here usually costs more later, because change orders during construction are priced without competitive pressure.
The shell you inherit
Second generation space looks cheaper than a cold shell, but leftover walls, ceilings and ductwork are rarely laid out for the next tenant. Demolition is the obvious line item. The less obvious ones are what demolition exposes.
Older buildings may have an electrical service too small for modern equipment, which can mean a new panel or a utility upgrade with long lead times. Restaurants, salons and veterinary clinics need floor drains, sinks and restrooms in new locations, so the concrete slab gets saw cut and trenched for plumbing. Adding rooftop units can require a structural check of the roof framing. Buildings from before the 1980s may also call for an asbestos survey before any material is disturbed, and abatement, if needed, is its own cost and schedule item.
Mechanical, electrical and plumbing
This is usually the largest layer, often 30 to 45 percent of total cost, and it is where state code has the strongest hand. The California Energy Commission’s 2025 Building Energy Efficiency Standards took effect January 1, 2026, and apply to projects permitted from that date. In a tenant improvement, altered lighting typically triggers requirements for occupancy sensing, multilevel dimming and daylight controls near windows and skylights. Many of these systems need acceptance testing by a certified technician before final inspection, which adds labor that older budgets never carried.
HVAC deserves close attention in the Valley. Summer afternoons routinely pass 100°F, and a space converted from storage to an office or exam room carries far more people and heat. Replacing rooftop units brings economizer and control requirements, and the current code continues the state’s push toward heat pumps. Getting load calculations right up front prevents the expensive mistake of undersized equipment in a space that cannot stay cool in July.
The accessibility share
California’s path of travel rule is one of the most misunderstood costs in a build-out. When a space is altered, the route serving it, including the entrance, parking, restrooms and the path to the altered area, must be brought up to current accessibility standards.
Projects at or below the valuation threshold. When the adjusted construction cost is at or below the figure published each January by the Division of the State Architect, path of travel spending can be limited to 20 percent of that cost, applied in a set priority order that starts with the entrance and route.
Projects above the threshold. Full compliance is expected unless the building official grants an unreasonable hardship finding.
The three year lookback. Alterations along the same path of travel within three years are added together, so phasing a project to stay under the threshold does not work the way many owners hope.
A retail strip with an older parking lot can see a meaningful share of the budget move outside the leased space entirely, into restriping, curb ramps and restroom upgrades.
Fire, life safety and finishes
New walls change how sprinklers cover a room, so heads are relocated or added, and alarm notification devices, exit signs and emergency lighting follow the new layout. The local fire authority reviews these separately, which can extend the schedule.
Finishes are the most visible layer and the most flexible one. Flooring, ceilings, millwork, paint and signage typically take 15 to 25 percent. This is where value engineering pays off, since swapping a finish rarely affects inspections.
| Cost layer | Typical share of budget | Valley pressure that pushes it up |
|---|---|---|
| Soft costs | 10 to 20% | Valuation based permit fees, specialty use reviews |
| Shell and demolition | 5 to 15% | Older strips, slab trenching, panel upgrades |
| MEP systems | 30 to 45% | Extreme summer heat, 2025 Energy Code controls |
| Accessibility | Up to 20% of adjusted cost | Older parking lots and restrooms |
| Fire and life safety | 3 to 8% | Sprinkler and alarm changes for new walls |
| Finishes | 15 to 25% | Tenant brand standards |
| Contingency | 5 to 15% | Hidden conditions in older buildings |
Contingency, allowances and timing
Contingency is not padding. A second generation space with good records might need 5 to 10 percent, while a 1970s building with unknown conditions justifies more. Owners who skip it end up funding surprises from operating cash.
The landlord’s tenant improvement allowance also shapes the anatomy. It is usually negotiated per square foot, often paid only after completion and lien releases, and anything above it falls to the tenant. Some leases require a landlord approved contractor or restrict work hours, both of which affect pricing.
Time is a cost layer of its own. Rent commencement often starts on a fixed date whether or not the space is open, so plan check delays and long lead equipment translate directly into lost revenue. A budget that accounts for schedule as carefully as materials is the one most likely to hold from lease signing to opening day.
