When a business leases a commercial space, the existing layout rarely matches exactly what the new tenant needs. Walls may need to be relocated, electrical systems upgraded, finishes replaced, or restrooms modified. The construction required to adapt that space is commonly called a commercial tenant improvement, or TI.
A tenant improvement can be as straightforward as updating paint, flooring, and lighting, or as involved as creating new offices, restrooms, treatment rooms, kitchens, or customer-facing retail areas.
In the City of San Diego’s permitting terminology, tenant improvements are generally described as nonstructural interior alterations to an existing commercial or industrial space. These projects typically require a building permit with plans, although the exact permitting requirements depend on the property, occupancy type, and scope of work.
Understanding what is and is not included in a tenant improvement proposal is essential before signing a lease, establishing a construction budget, or comparing contractor bids.
1. Preconstruction and Existing-Conditions Evaluation
A successful tenant improvement begins before construction starts.
During preconstruction, the contractor and design team may evaluate:
The existing layout and available square footage
Electrical service and panel capacity
Plumbing and sewer locations
Existing HVAC equipment and distribution
Fire sprinkler and fire alarm systems
Accessible entrances, restrooms, and paths of travel
Structural or equipment-anchorage requirements
Existing damage or deferred maintenance
Landlord construction requirements
Building access, working hours, and jobsite logistics
This evaluation helps identify whether the proposed design is realistic for the space and whether expensive system upgrades may be required.
A space that looks move-in ready may still require significant work behind the walls. Discovering those requirements early gives the tenant a more reliable budget before committing to construction.
2. Architectural Plans and Engineering
Many commercial tenant improvements require plans prepared by an architect, engineer, or other qualified design professional.
The design package may include:
Existing and proposed floor plans
Demolition plans
Reflected ceiling plans
Interior elevations
Door and hardware schedules
Finish schedules
Accessibility details
Electrical and lighting plans
Plumbing plans
Mechanical or HVAC plans
Fire alarm and sprinkler documentation
Structural calculations when required
The design should address how the business will actually operate, not only how the space will look. Equipment placement, customer circulation, employee workflow, storage, deliveries, and future growth should all be considered.
For certain qualifying office tenant improvements, the City of San Diego offers a professional certification permitting process. However, eligibility depends on factors such as project size, occupancy, design professionals, and the completeness of the submittal.
3. Permits and Code Compliance
Permit coordination is commonly included as part of a commercial tenant improvement, but the specific permit fees and design costs may be listed separately in the contract.
Depending on the project, permits may be required for:
Building construction
Electrical work
Plumbing work
Mechanical systems
Fire alarm modifications
Fire sprinkler modifications
Signage
Equipment installation
Health department approval
Changes in occupancy or use
Accessibility requirements must also be evaluated. Alterations to an area serving a primary function can trigger improvements to accessible features or the path of travel, depending on the project and applicable requirements.
The contractor should clearly explain who is responsible for preparing plans, submitting permits, responding to plan-check comments, paying agency fees, and scheduling inspections.
4. Demolition and Site Protection
Once permits are approved, construction generally begins with demolition and preparation.
This may include:
Removing non-load-bearing walls
Removing ceilings, flooring, or millwork
Disconnecting outdated equipment
Removing plumbing and electrical fixtures
Saw-cutting concrete for new underground utilities
Protecting occupied or shared areas
Installing dust barriers and temporary partitions
Hauling and disposing of construction debris
In an occupied building, demolition may need to occur after hours or in phases to minimize disruption to neighboring businesses.
5. Framing, Drywall, and Interior Layout
The new layout is created after demolition.
Typical work includes:
Metal or wood framing
Drywall installation
Insulation
Sound-control assemblies
Fire-rated walls and penetrations
Suspended ceilings
Doors, frames, and hardware
Interior windows or glass partitions
Blocking for cabinets, displays, televisions, or equipment
The complexity of the wall assemblies depends on the use of the space. A standard office partition is different from a fire-rated corridor, medical treatment room, commercial kitchen wall, or sound-controlled conference room.
6. Mechanical, Electrical, and Plumbing Work
Mechanical, electrical, and plumbing systems, often referred to as MEP, can represent a significant portion of a tenant improvement budget.
Electrical work may include:
New outlets and dedicated circuits
Lighting and lighting controls
Electrical panel upgrades
Emergency and exit lighting
Power for specialized equipment
Low-voltage pathways
Data and communications infrastructure
Plumbing work may include:
New sinks or restrooms
Breakroom plumbing
Floor drains
Water heaters
Gas piping
Grease waste systems
Relocation of water and sewer lines
Mechanical work may include:
New HVAC equipment
Relocation of supply and return ducts
Exhaust systems
Ventilation improvements
Thermostats and controls
Testing and balancing
Before construction begins, the project team should confirm whether the building’s existing systems have sufficient capacity to support the new business.
7. Fire and Life-Safety Systems
A change in layout can affect fire sprinklers, smoke detection, fire alarms, exit signs, emergency lighting, and travel distances.
Even when only a few sprinkler heads or alarm devices are moved, separate documentation or permits may be required. The City of San Diego maintains specific forms and permitting processes for fire sprinkler and fire alarm alterations associated with tenant improvements.
Fire and life-safety coordination should occur during design, not after the ceiling has already been installed.
8. Interior Finishes and Millwork
The finishes are the most visible portion of the completed project.
A tenant improvement may include:
Flooring
Baseboards
Interior painting
Wall coverings
Tile
Acoustic ceilings
Decorative ceiling features
Cabinets and countertops
Reception desks
Display shelving
Breakroom cabinetry
Bathroom accessories
Interior signage
Material selections can significantly affect both cost and schedule. Custom millwork, specialty tile, imported fixtures, and long-lead equipment should be approved and ordered early.
9. Inspections, Punch List, and Project Closeout
Construction is not complete when the last finish is installed.
Closeout may include:
Final building inspections
Final electrical, plumbing, and mechanical inspections
Fire department approvals
Correction of punch-list items
Final cleaning
Equipment startup and testing
Warranty documentation
Product manuals
As-built drawings when required
Certificate of Occupancy coordination when applicable
Owner and tenant training for new systems
The contractor should also provide a clear list of warranty contacts and explain how post-construction service requests will be handled.
What Is Often Excluded From a Tenant Improvement Proposal?
Not every proposal includes the same services. Potential exclusions include:
Architectural and engineering fees
Permit and agency fees
Furniture and movable equipment
Computers, televisions, and technology
Internet and security systems
Exterior or monument signage
Hazardous-material testing or abatement
Utility company charges
Landlord-required improvements outside the suite
After-hours or overtime work
Temporary relocation expenses
Work discovered behind walls or below floors
These exclusions are not necessarily a problem. The important thing is that they are identified clearly before the contract is signed.
How Should You Compare Tenant Improvement Proposals?
Do not compare only the total price.
Review whether each proposal includes the same:
Plans and engineering
Permit coordination
Demolition
MEP work
Fire and accessibility requirements
Finish quality
Allowances
Cleanup
Inspections
Supervision
Schedule
Warranty
A lower proposal may simply contain fewer items or larger unknowns.
The strongest tenant improvement proposal clearly defines the scope, assumptions, allowances, exclusions, schedule, and change management process.
Planning a Commercial Tenant Improvement in San Diego?
A commercial build-out requires coordination between the tenant, property owner, design team, contractor, building management, inspectors, and specialty trades.
SAND Builders helps San Diego County businesses and property owners evaluate commercial spaces, define construction scopes, coordinate qualified trades, and manage tenant improvements from pre-construction through closeout.
Starting the construction conversation early can help identify potential problems before they affect your opening date or operating budget.
