A tenant improvement, or TI, is the interior construction that turns a leased commercial shell or an older suite into a space your business can actually work in. Walls, ceilings, flooring, lighting, HVAC distribution, plumbing, data, restrooms, and finishes all fall under it. If you have ever leased office, retail, medical, or restaurant space and had it "built out" to your plan, that build-out was a tenant improvement.
What "Tenant Improvement" Actually Means
The building shell is the structure, exterior walls, roof, and primary systems that the landlord delivers. The tenant improvement is everything a specific tenant needs inside that shell to operate. Two suites in the same building can start identical and end up completely different, because a law firm, a dental office, and a coffee shop each need very different interiors.
A typical TI scope covers some or all of the following:
- Demolition of existing partitions, finishes, or old MEP (mechanical, electrical, plumbing) that no longer fit the plan
- New interior framing, drywall, and doors to lay out offices, exam rooms, or a dining area
- Ceilings, flooring, paint, millwork, and other finishes
- Electrical, lighting, and low-voltage data and security rough-in
- HVAC distribution and controls sized to the new layout and occupancy
- Plumbing for restrooms, break rooms, and specialty needs like a lab or kitchen
- Fire sprinkler head relocation and, where required, a fire alarm tie-in
The Process, From Lease to Occupancy
Most fit-outs follow the same broad arc. Understanding it up front is the single best way to keep an opening date realistic.
Design and pricing
An architect (and often an engineer for medical, restaurant, or heavy-power spaces) turns your program into a set of permit drawings. This is also where a contractor should be pricing the work, so the design stays inside your budget instead of surprising you after it is drawn.
Permitting and jurisdiction review
The plans go to the city for a commercial building permit. In the DFW area, review timelines vary by jurisdiction, and health department or fire marshal review adds time for certain uses. Building this into the schedule from day one is far better than treating it as a delay.
Construction
Demo, rough-in, inspections, drywall, finishes, and equipment set, roughly in that order, with city inspections gating each phase. A well-run job sequences the inspections so trades are not standing around waiting.
Closeout and certificate of occupancy
Final inspections, the punch list, and the certificate of occupancy (CO) that legally lets you open. A missing CO is one of the most common reasons a "finished" space cannot open on the planned day, so it belongs on the critical path from the start.
Plan the schedule backward from your opening date and put permitting and the certificate of occupancy on it as real line items, not afterthoughts. Long-lead equipment, a rooftop HVAC unit, custom millwork, or a walk-in cooler, should be ordered early, because a four-week material delay can cost you an opening month.
Working in an Occupied Building
Plenty of tenant improvements happen while the rest of the building, or even the same suite, keeps operating. A clinic adds two exam rooms while still seeing patients. An office reconfigures one wing while the other keeps working. This is where phasing and jobsite discipline matter as much as the construction itself.
On occupied work, a good builder plans for the things that make the difference between disruptive and invisible:
- Dust and debris control, with temporary partitions and negative air where needed
- After-hours and weekend work for the loud or disruptive tasks
- Protected, separated paths so the public and your staff never cross the work zone
- Coordinated shutdowns of power, water, or fire protection scheduled so they never catch anyone off guard
- Daily cleanup, because an occupied space has to look presentable every morning
The measure of a good occupied-building project is simple: your customers and staff should barely notice the work is happening.
Medical and Dental Buildouts
Healthcare space is one of the more demanding TI categories, and for good reason. The work has to satisfy accessibility rules, infection-control expectations, and equipment requirements that a standard office never touches.
Common medical and dental specifics include:
- Extra plumbing for sinks in nearly every room, plus specialized drains and, in dental, compressed air and vacuum lines
- Dedicated and often higher-capacity electrical for imaging, sterilizers, and dental chairs
- HVAC designed for comfort, air quality, and in some rooms specific pressure relationships
- Lead shielding around X-ray and imaging rooms where required
- Durable, cleanable, seamless finishes that hold up to constant sanitizing
- Health department review in addition to the standard building permit
Because so much of the cost and schedule is buried in the systems behind the walls, medical buildouts reward early coordination between the tenant, the equipment vendors, the designers, and the contractor.
Restaurant and QSR Buildouts
Restaurants and quick-service (QSR) spaces are, dollar for dollar, some of the most involved interiors a contractor builds. The dining room is the easy part. The kitchen is where the budget and the schedule live.
Expect the scope to include:
- Commercial kitchen exhaust hoods with fire suppression and make-up air
- Grease interceptors and extensive kitchen plumbing
- Heavy electrical and gas service for cooking equipment
- Walk-in coolers and freezers, often a long-lead item
- Health department plan review and inspection, plus fire marshal sign-off
- Durable, code-compliant finishes throughout the food-prep areas
Restaurant buildouts also tend to involve more agencies and more inspections than a plain office, which is exactly why the schedule has to be built around them rather than the other way around.
A Note on TI Allowances
Many commercial leases include a tenant improvement allowance, money the landlord contributes toward building out the space, usually quoted as a dollar figure per square foot. It is a real and useful benefit, but it comes with details worth understanding before you sign.
- The allowance rarely covers everything. If your buildout costs more than the allowance, the difference is on you, so an early, honest budget matters.
- Allowances are often reimbursed after the work is done and documented, which means you may need to fund the construction first and get paid back.
- What the allowance can be spent on (construction only, or also design, permits, and cabling) is defined in the lease, not assumed.
As a very general planning benchmark, straightforward office TIs in the DFW market often land somewhere in the ballpark of a moderate dollar range per square foot, while medical and restaurant work runs meaningfully higher because of the systems involved. Treat those as typical ranges for early planning only. Real numbers come from your actual drawings, finishes, and space.
How Aghorn Interests Approaches This
Tenant improvements are a core part of what we do at Aghorn Interests. We price the work early, so the design stays inside your budget and your lease math holds up, and we run the job in the field with our own team so the schedule you hand your landlord or your bank is the one you actually open on.
If you are building out office, medical, retail, or restaurant space, our tenant improvement services cover it from the first budget conversation to the certificate of occupancy, including the occupied-building phasing that keeps your operation running while we work. You can see the full range of commercial spaces we build across the DFW area on our markets page, and when you are ready to talk specifics, send us the drawings or the idea and we will follow up with real numbers.