Tenant Improvement Projects: A GC's Guide to Commercial Buildouts | Projul

If you have been in commercial construction for any length of time, you have probably done tenant improvement work. TI projects are the bread and butter of a lot of GCs, especially in markets where new ground-up construction slows down but lease activity keeps moving. Every time a new tenant signs a lease or an existing tenant decides to reconfigure their space, somebody needs to build it out. That somebody is usually us.

But TI work is its own animal. It is not the same as building a new shell, and it is definitely not the same as residential remodeling. The timelines are compressed, the stakeholders multiply fast, and the margin for error on scheduling and budgets is razor thin. If you are a GC looking to break into TI work or tighten up your existing process, this guide covers the major pieces you need to get right.

Understanding the TI Project Structure

Before you swing a hammer on any tenant improvement job, you need to understand how these projects are structured financially and contractually. The setup on a TI job is different from most other commercial work, and getting it wrong early will cost you later.

Most TI projects involve three parties: the landlord (or property management company), the tenant, and you as the GC. The landlord typically provides a TI allowance as part of the lease, which is a set dollar amount per square foot that covers buildout costs. The tenant might also contribute funds above that allowance for upgrades they want. Your contract could be with either party, and sometimes you end up answering to both, which is where things get interesting.

Understanding who controls the budget and who has final approval on design decisions will save you a lot of wasted time. On some jobs, the tenant’s interior designer is driving the bus. On others, the landlord’s property manager is reviewing every change order. Get this sorted out at the kickoff meeting and document it. You want one clear decision maker for approvals, or at minimum a defined process that does not require chasing three people for a signature on a $500 change.

The scope on TI work can range wildly. On one end, you have a “warm shell” buildout where the base building systems are already in place and you are adding partition walls, doors, ceiling grid, and finishes. On the other end, you have a full gut renovation where you are tearing everything back to the deck and starting over. Most jobs fall somewhere in between, and the ones that cause the most headaches are the ones where the scope creeps from one end toward the other after you have already signed a contract.

If you are coming from residential work and looking to move into commercial TI projects, our guide on transitioning from residential to commercial construction covers the business side of making that jump.

Scoping and Estimating TI Work

This is where TI projects are won or lost. Get the scope right and your estimate tight, and the job will run. Miss something in the existing conditions, and you are eating costs or fighting over change orders for the next three months.

Every TI estimate should start with a thorough site walk. And I mean thorough. Pop ceiling tiles and look above. Open electrical panels. Check the condition of existing HVAC equipment. Look at the plumbing risers. Document everything with photos. You are not just pricing what the architect drew on paper. You are pricing the gap between what exists today and what the drawings show as the finished product.

Here is a list of things that will bite you if you miss them during your site walk:

• Existing conditions above the ceiling. Old framing, abandoned ductwork, fire sprinkler lines that do not match the new layout, and wiring that has been spliced six times since 1985. All of this has to be dealt with, and none of it shows up on the architectural plans.
• Base building systems capacity. Does the existing electrical panel have enough capacity for the new tenant’s needs? Is the HVAC tonnage sufficient for the new layout? If the tenant is adding a server room or a commercial kitchen, the existing systems probably will not cut it.
• ADA compliance gaps. If the space has not been renovated recently, there is a good chance the restrooms, doorways, and common areas do not meet current ADA requirements. The cost to bring these up to code can be significant and is often missed in early budgets.
• Hazardous materials. In older buildings, you may be dealing with asbestos in floor tiles, pipe insulation, or ceiling texture. Lead paint is another possibility. Abatement costs need to be in the budget before you start demo.

A solid estimating process is critical for TI work because the margin between winning the job and losing money on it is often only a few percentage points. Break your estimate into clear categories: demolition, framing and drywall, MEP rough-in, ceiling and flooring, finishes, and specialty items. Carry contingency for unknowns, and be upfront with your client about what that contingency covers.

Read real contractor reviews and see why Projul carries a 9.8/10 on G2.

One more thing on estimating. If you are bidding competitively against other GCs, resist the temptation to cut your contingency to sharpen your number. The GC who wins a TI job with a razor-thin contingency and then has to submit change orders for every surprise is the GC who does not get invited back. Landlords and property managers remember that.

Scheduling and Phasing the Work

Time is money on every construction project, but on TI work, it is especially true. Tenants are paying rent on a space they cannot occupy. Landlords want their building generating income. Everyone wants the job done yesterday.

The typical TI project timeline looks something like this:

1. Pre-construction (2 to 6 weeks). Design finalization, permitting, material procurement, and subcontractor buyout. This phase is often compressed or overlapped with early construction activities.
2. Demolition and rough-in (2 to 4 weeks). Demo existing finishes, frame new walls, run MEP rough-ins. This is where you discover all the surprises hiding behind the walls.
3. Finishes (2 to 4 weeks). Drywall finishing, paint, ceiling grid, flooring, millwork, and specialty finishes.
4. Final MEP and inspections (1 to 2 weeks). Trim out electrical, plumbing, and HVAC. Fire alarm and sprinkler testing. Final inspections and punch list.

The key to keeping a TI project on schedule is managing the handoffs between trades. In a confined space with a compressed timeline, your electrician, plumber, HVAC crew, and drywall team are all going to be on top of each other. If your framing crew falls behind by two days, that delay cascades through every trade behind them.

Good scheduling tools make a real difference here. You need to be able to see the critical path clearly and communicate schedule changes to subs in real time. Weekly schedule updates are not enough on a fast-track TI job. You should be looking at the schedule daily and communicating with your supers and subs constantly.

Phasing is another consideration, especially on occupied buildings. If you are building out one suite while the tenant next door is running a business, you need to plan your noisy work, demo, concrete cutting, core drilling, around their operating hours. Same goes for any work that affects building-wide systems like fire alarms or elevators. Coordinate with the property manager and give adjacent tenants advance notice. A little communication goes a long way toward avoiding complaints and keeping the landlord happy.

For multi-phase TI projects, consider breaking the work into zones that can be completed and turned over independently. This lets the tenant start occupying finished areas while you complete the rest. It adds complexity to your scheduling, but tenants love it and it can be a real differentiator when you are competing for work.

MEP Coordination on TI Projects

If there is one thing that separates a smooth TI job from a disaster, it is MEP coordination. In commercial tenant improvement work, the mechanical, electrical, and plumbing systems are where most of the complexity lives. Getting these trades coordinated early and keeping them aligned throughout the project is critical.

On a typical office TI, you are dealing with:

• HVAC modifications. Relocating or adding diffusers, extending ductwork to new offices or conference rooms, and adjusting the controls to accommodate the new layout. If the tenant has specific temperature requirements for server rooms or specialized equipment, you may need supplemental cooling units.
• Electrical distribution. New circuits for workstations, dedicated circuits for break rooms or kitchens, data and communications cabling, and lighting layouts that match the new floor plan. LED retrofit is common on TI jobs and can be a selling point for energy-conscious tenants.
• Plumbing. Break room sinks, additional restrooms, and any specialty plumbing for the tenant’s business. Retail TI projects for restaurants or salons will have significantly more plumbing scope than a standard office buildout.
• Fire protection. Anytime you move walls, you are probably moving sprinkler heads. The fire sprinkler contractor needs to be involved early because their work affects ceiling layout, and inspection scheduling can hold up your certificate of occupancy. Check out our fire protection guide for more on this.

The biggest mistake GCs make on TI MEP coordination is waiting too long to get the trades talking to each other. Do not wait until rough-in starts. Get your mechanical, electrical, plumbing, and fire protection subs together during pre-construction to review the drawings and work out conflicts on paper instead of in the field.

Ceiling space is usually the battleground. In a commercial building with an 8 to 9 foot finished ceiling, you have limited space above the grid for ductwork, piping, conduit, cable tray, and sprinkler lines. If everyone just goes and installs according to their own shop drawings without coordinating, you end up with conflicts that cost time and money to resolve.

For a deeper dive into managing trade coordination, our MEP coordination guide covers the full process from pre-construction through final inspections.

Common Pitfalls and How to Avoid Them

After running enough TI projects, you start to see the same problems show up again and again. Here are the ones that catch GCs most often, along with what you can do about them.

Scope creep from the tenant. This is the number one issue on TI work. The tenant walks the job site, sees their space taking shape, and starts asking for changes. “Can we add a door here?” “What if we upgraded the flooring in the lobby?” “We decided we actually need two more offices.” Each of these changes individually might be small, but they add up fast. The fix is a clear change order process documented in your contract, with defined turnaround times for pricing and written approval required before any additional work starts. Do not do extra work on a handshake.

Long lead materials killing the schedule. Custom millwork, specialty light fixtures, certain flooring products, and glass partitions can have lead times of 6 to 10 weeks or more. If you do not identify these items early and get them ordered during pre-construction, they will blow up your schedule. Build a procurement log during estimating and flag anything with a lead time over two weeks.

Permitting delays. Every jurisdiction is different, and some are painfully slow. If your project requires plan review, factor in realistic review times based on your experience in that area. Some GCs submit for permits before the design is 100% complete, issuing addenda for final details later. This is risky but can save weeks on a tight schedule. Know your local process and plan accordingly.

Underestimating demo and existing conditions. I mentioned this in the estimating section, but it is worth repeating. The single most common source of budget overruns on TI work is discovering conditions during demo that were not visible during the site walk. Carry adequate contingency and set expectations with your client upfront about the possibility of hidden conditions.

Not managing the building relationship. On TI work, you are a guest in someone else’s building. The property manager controls access, loading dock schedules, elevator usage, and after-hours HVAC. If you do not build a good working relationship with the building management team, your project will suffer. Get their rules and procedures in writing at the start of the job, share them with your subs, and follow them. A property manager who trusts you will make your life much easier on the current job and help you land future work in the same building.

Ignoring the close-out process. TI projects often have specific close-out requirements from the landlord, including as-built drawings, equipment manuals, warranty documentation, and lien waivers from every sub. Do not wait until the last week of the job to think about close-out. Start compiling documents as you go. A clean, timely close-out is one of the best ways to build your reputation with landlords and property managers.

Building a Repeatable TI Operation

If you want TI work to be a consistent revenue stream for your company, and it should be because it tends to be more recession-resistant than new construction, you need to build a repeatable process around it.

That starts with standardizing your pre-construction workflow. Create templates for your site walk checklists, estimating spreadsheets, and proposal formats. Every TI job is different in the details, but the overall process should be the same. When you can move from initial site walk to submitted proposal in 5 to 7 business days instead of three weeks, you win more work.

Build relationships with a core group of subcontractors who understand TI work. The subs who are great at ground-up commercial construction are not always the right fit for TI projects. TI work requires subs who can work in occupied buildings, handle smaller scopes efficiently, and adapt to schedule changes quickly. Find the ones who get it and keep them busy.

Invest in systems that support fast-moving projects. Spreadsheets and email work fine when you are running one or two jobs. When you have five or six TI projects going at once in different phases, you need better tools for tracking budgets, schedules, and communication. Projul’s project management platform is built for contractors who need to keep multiple projects organized without spending half their day on admin work.

Develop your estimating database over time. Every TI job you complete gives you better data on actual costs per square foot for different types of buildouts in your market. Track your estimates against actual costs and refine your numbers. After 20 or 30 TI projects, your estimating accuracy will be significantly better than a GC who is starting fresh.

Finally, focus on repeat business. The best TI contractors are not constantly chasing new clients. They are getting called back by the same landlords, property managers, and tenants who had a good experience the first time. This means delivering on your promises, communicating proactively when problems come up, handling change orders fairly, and finishing the close-out process without being chased for documents.

TI work is not glamorous. You are not going to see your tenant improvement project on the cover of a construction magazine. But it is steady, it is profitable when managed well, and it builds long-term relationships that lead to more work. For GCs who take the time to build a real system around it, tenant improvement construction can be the most reliable part of your business.

Book a quick demo to see how Projul handles this for real contractors.

The contractors who do this work well are the ones who treat every 3,000 square foot office buildout with the same attention to process and detail that they would give a $10 million project. The scope is smaller, but the fundamentals are exactly the same: know your numbers, manage your schedule, coordinate your trades, communicate with your client, and close out clean. Do that consistently, and the work will keep coming.