When is the best time to start my buildout relative to my lease signing in 2027?

The numbers you should expect

When planning a commercial buildout relative to a 2027 lease signing, the timeline numbers matter more than almost anything else. A typical commercial buildout—whether for office, retail, or light industrial space—runs 12–20 weeks of actual construction for a mid-sized space (5,000–20,000 square feet). But that construction window sits inside a much longer overall process. Before any contractor sets foot on site, you need design, engineering, permitting, and landlord approvals, which together add another 8–16 weeks. The full cycle from "we have a space" to "we open the doors" usually lands between 5 and 9 months.

Here is a realistic month-by-month breakdown for a 2027 lease signing, assuming a mid-sized buildout with moderate complexity:

• Month 12–10 before signing: Space needs assessment, budget modeling, architect shortlisting, and preliminary floor plan concepts. You should know your square footage, headcount or inventory plan, and functional requirements before you negotiate the lease.
• Month 10–8 before signing: Full architectural drawings, engineering coordination (HVAC, electrical, plumbing, data), and initial cost estimates. This is also when you start talking to general contractors about pricing and constructability.
• Month 8–6 before signing: Landlord design review (if required by the lease), permit application preparation, and final construction documents. Your contractor should be doing a detailed takeoff and value-engineering pass.
• Month 6–4 before signing: Permit submission and approval. Depending on your municipality, this can take 2–8 weeks. Simultaneously, finalize your TI allowance negotiation with the landlord—your detailed drawings give you leverage because you know exactly what the space needs.
• Month 4–2 before signing: Contractor bidding and selection, long-lead item ordering (custom millwork, specialty lighting, HVAC units, data infrastructure), and pre-construction planning.
• Month 2–0 before signing: Finalize lease terms, sign, and have your contractor mobilize within 1–2 weeks of receiving the keys.

If you compress this, you can sometimes get from signed lease to occupancy in 10–12 weeks for a light-touch buildout (paint, carpet, furniture, IT). But that only works if the design and permitting work is already done. If you start from scratch at lease signing, you are looking at 6–9 months before you can occupy—and that delay costs you rent on a space you cannot use, plus the opportunity cost of delayed operations.

The most common mistake is treating lease signing as the starting gun. It is not. Lease signing is the midpoint of your buildout timeline. Everything before signing is planning; everything after is execution. The best time to start is the day you seriously begin looking at spaces, because the planning work you do early is what makes the post-signing execution fast.

What drives those numbers

The timeline above is not arbitrary—it is driven by several hard constraints that stack on top of each other. Understanding these drivers helps you make smart decisions about when to start each phase of your buildout relative to your lease signing.

The first driver is permitting. Municipal building departments operate on their own schedules, and you cannot reliably compress them. A simple interior remodel might get a permit in 2–3 weeks in a fast jurisdiction; a complex space with HVAC changes, fire alarm work, or structural modifications can take 6–12 weeks. Some cities require separate permits for electrical, plumbing, and mechanical work, each with its own review queue. If your space is in a historic district or has zoning complications, add more time. Since permits are tied to the property address and the tenant improvement scope, you can often submit them before you sign the lease—the landlord or their authorized agent can file, or you can file with a letter of authorization from the landlord. This is a critical move: get the permit application in the queue before signing so the review clock runs while you finalize lease terms.

The second driver is landlord design review. Most commercial leases give the landlord the right to review and approve your construction drawings, especially if the work touches building systems, structural elements, or the exterior. This review typically takes 1–3 weeks per round, and landlords often come back with comments that require revisions. Budget for two rounds minimum. If you start this process only after signing, you add 3–6 weeks to your timeline before construction can even begin. If you start it before signing, you can have approvals in hand the day you sign.

The third driver is construction sequencing. Contractors book their crews and subcontractors weeks or months in advance. A general contractor who knows your project is coming can reserve electricians, plumbers, and drywall crews for your window. If you sign a lease and then start looking for a contractor, you are joining the back of the queue. In busy construction markets, that can add 4–8 weeks of delay. Starting your contractor conversations 4–6 months before signing lets you lock in pricing and scheduling.

The fourth driver is long-lead items. Custom millwork, specialty glass, HVAC equipment, data center infrastructure, and even some furniture have lead times of 6–16 weeks. If you order these items after lease signing, they may not arrive until after your construction is complete, forcing you to either delay occupancy or move in and work around missing pieces. Ordering before signing—with a contingency in the lease for the landlord to reimburse or for you to assign the purchase order—keeps your post-signing timeline tight.

The fifth driver is TI allowance verification. Your tenant improvement allowance is typically paid by the landlord as reimbursement after construction, or as a direct payment to the contractor. The lease will specify the allowance amount, the eligible work categories, and the draw process. If you have detailed drawings and cost estimates before you negotiate the allowance, you know exactly how much you need. That knowledge gives you negotiating leverage: you can ask for a higher allowance, a larger contribution to soft costs (design fees, permits, IT), or free rent during the construction period. Without drawings, you are negotiating blind.

Lease, TI allowance, and negotiation levers

Your lease signing is not just a date on the calendar—it is the moment when your TI allowance, rent abatement, and landlord obligations get locked in. The timing of your buildout relative to signing directly affects how much leverage you have in these negotiations.

The TI allowance is the landlord's contribution to your construction costs, typically expressed as dollars per square foot. In 2025–2026 market conditions, office TI allowances in major metros range from $30–$80 per square foot for full-service leases, with Class A space at the higher end. Retail allowances vary more widely, from $15–$60 per square foot depending on the landlord's appetite for the tenant and the condition of the shell. Industrial space often gets less—$10–$30 per square foot—because the buildouts are simpler. But these numbers are only a starting point. The real question is whether the allowance covers your actual buildout cost, and that is where timing matters.

If you approach the landlord with a complete set of drawings and a contractor's cost estimate showing your buildout will run $75 per square foot, you can make a specific, credible case for a $75 allowance. If you approach them with a vague "we need a nice space" and no drawings, they will offer you their standard number and dare you to push back. The difference between those two positions is often $10–$30 per square foot, which on a 10,000-square-foot space is $100,000–$300,000. That is real money, and it is available to you simply by doing your design work before you negotiate.

Beyond the allowance itself, several other lease terms are buildout-sensitive:

• Rent abatement (free rent): Landlords commonly offer 1–3 months of free rent for buildout time, sometimes more for larger spaces. If your buildout will take 4 months, you want 4 months of abatement. Your detailed schedule—showing exactly how long each phase takes—is the evidence you need to justify the request.
• Landlord work: Some leases require the landlord to deliver the space in a certain condition (the "delivery condition"). This might include a concrete floor, exposed structure, or a finished demising wall. The lease should specify the delivery date and what happens if the landlord is late. Your buildout schedule should account for the landlord's work, and your lease should hold them to a date that feeds your timeline.
• Early access: Negotiate for early access to the space before lease commencement, even if it is just for design measurements, contractor walk-throughs, or pre-construction work. A 30–60 day early access period can let your contractor start demolition and rough-in work while the lease is still being finalized.
• Construction insurance and indemnity: Your contractor will need to provide certificates of insurance naming the landlord as an additional insured. The lease will require this. Get your contractor's insurance paperwork in order before signing so there is no gap between signing and mobilization.
• Change order process: The lease or the construction contract should define how change orders are handled, who approves them, and how they affect the TI allowance. A clear process prevents disputes when you discover something unexpected during demolition.

One more lever: the landlord's own timeline. If the landlord has been carrying vacant space, they want a tenant who can open quickly. A tenant who shows up with drawings, permits, and a contractor ready to go is more attractive than one who needs 6 months to figure out what they want. That attractiveness translates into better terms—higher allowance, more abatement, faster approval processes. Your preparation is not just about your own schedule; it is a negotiating asset.

Also consider the structure of the TI allowance payment. Some landlords reimburse you after you pay the contractor; others pay the contractor directly; others provide an upfront lump sum. The reimbursement model means you need working capital to cover construction costs, which affects your cash flow planning. If you know your buildout cost before signing, you can negotiate for an upfront payment or a progress-payment schedule that keeps your cash flow manageable.

Finally, think about what happens if your buildout runs late. The lease will have a rent commencement date, usually tied to the earlier of a fixed date or substantial completion of the landlord's work. If your buildout takes longer than planned, you still owe rent. Your contingency buffer—built into the schedule before signing—is what protects you. A 2–4 week buffer in your pre-signing planning is the difference between a stressful late opening and a smooth one.

Sequencing the buildout

The sequence of your buildout relative to lease signing is not a single decision—it is a series of decisions, each with its own timing. Here is a practical sequencing framework that works for most commercial buildouts.

Phase 1: Requirements and site selection (Month 12–10 before signing). Before you can design a buildout, you need to know what the space must do. How many employees or what inventory volume? What equipment or specialized infrastructure? What adjacency requirements (conference rooms, break areas, loading docks, server rooms)? What growth projections? This phase is internal—you are not spending money on design yet, just building the brief. This is also the time to look at multiple spaces and compare their shell conditions. A space with an existing improved ceiling, finished floors, and working HVAC will cost far less to build out than a raw shell. The condition of the space directly affects your TI allowance needs and your timeline.

Phase 2: Design and engineering (Month 10–6 before signing). Once you have a shortlist of spaces, hire an architect and engineers to develop drawings. If you are not sure which space you will get, you can develop a "prototype" design that adapts to different floor plans—this is common for retail and restaurant chains. For a single-space tenant, wait until you have a signed letter of intent (LOI) on the space, then start full design. The LOI gives you enough certainty to spend design dollars. The design phase produces the drawings you need for landlord review, permitting, and contractor pricing. Budget 8–12 weeks for this phase, including revisions.

Phase 3: Landlord review and permits (Month 6–4 before signing). Submit your drawings to the landlord for design review. Simultaneously, prepare the permit application. Some jurisdictions let you submit before the lease is signed; others require proof of tenancy. If you need the lease to apply, you can sign a conditional lease or get a letter from the landlord. The goal is to have the permit in review before signing so the clock is running. This phase also includes value engineering—working with your contractor to bring costs in line with your budget and the TI allowance.

Phase 4: Contractor selection and pre-construction (Month 4–2 before signing). Get bids from 2–3 general contractors. Evaluate them on price, schedule, and track record with similar buildouts. Check their licenses, insurance, and references. Once selected, have the contractor do a pre-construction walkthrough, order long-lead items, and prepare a detailed construction schedule. This is also when you finalize the construction contract—fixed price, cost-plus, or guaranteed maximum price (GMP). For most buildouts, a GMP contract with a contingency line item is the safest choice.

Phase 5: Lease signing and mobilization (Month 2–0 before signing). Finalize the lease, including the TI allowance, abatement, delivery condition, and early access provisions. Sign, get the keys, and have your contractor mobilize. If you have done the pre-signing work, mobilization takes days, not weeks.

Phase 6: Construction and occupancy (Month 0–5 after signing). Construction runs 12–20 weeks depending on scope. Your contractor should provide weekly progress reports, and you should walk the site weekly. Inspections happen at rough-in, before drywall, and at completion. The certificate of occupancy (CO) is your final approval—you cannot legally occupy without it. After the CO, you move in furniture and IT, test systems, and open for business.

The key insight is that the sequence is linear, but the phases overlap. Design overlaps with lease negotiation. Permitting overlaps with TI allowance negotiation. Contractor selection overlaps with lease finalization. The more you can overlap, the shorter your total timeline. The constraint is that each phase produces an output that feeds the next—you cannot get a permit without drawings, and you cannot negotiate an accurate TI allowance without a cost estimate. Start early enough that each phase has the input it needs when you need it.

If you are reading this in 2026 and your lease signing is in 2027, you have time. The best time to start is now—not because you need to spend money today, but because the planning work you do this year is what makes next year's signing and buildout smooth. A 12-month runway gives you room for design iterations, permit delays, and contractor scheduling. A 6-month runway is workable but tight. A 3-month runway is a crisis. Do not be the tenant who signs a lease and then discovers the buildout will take 8 months—that is how you pay rent on a dark space.

Related questions

How much does a commercial buildout cost per square foot?

Light-touch buildouts (paint, carpet, furniture) run $15–$40 per square foot. Full buildouts with new HVAC, electrical, and finishes run $50–$150 per square foot. Your TI allowance may cover part or all of this, depending on the lease terms and market conditions.

Can I get a tenant improvement allowance on a short lease?

Landlords are less willing to fund large TI allowances on leases under 5 years because they need time to recoup their investment. A 3-year lease might get $10–$20 per square foot, while a 10-year lease can justify $50–$80 per square foot.

What happens if my buildout is not finished by the rent commencement date?

You owe rent regardless of whether your buildout is complete, unless the lease has a rent abatement or delay clause. This is why scheduling a realistic timeline with a contingency buffer before signing is critical.

Do I need a general contractor or can I manage the buildout myself?

For buildouts over $100,000 or involving multiple trades, a general contractor is strongly recommended. They handle scheduling, subcontractor coordination, permits, and inspections. Self-managing works only for very small, simple projects.

FAQ

When is the best time to start my buildout relative to my lease signing in 2027?

Start planning 9–12 months before signing, with design and permit work beginning 4–6 months prior. This lets you negotiate your TI allowance with real numbers, get permits in review, and have a contractor ready to mobilize immediately after signing. Construction itself runs 12–20 weeks after you get the keys.

What is the single biggest factor that affects buildout timing?

Permitting is the most unpredictable factor. Municipal review times range from 2 weeks to 12 weeks, and you cannot reliably compress them. Starting the permit application before lease signing—with the landlord's authorization—is the single most effective way to shorten your post-signing timeline.

How does the TI allowance affect when I should start?

Your TI allowance is negotiated at lease signing, and your leverage depends on having detailed drawings and cost estimates. If you start design work 6–10 months before signing, you walk into the negotiation with specific numbers. If you start after signing, you accept whatever the landlord offers.

Should I hire an architect before I sign the lease?

Yes, if you have an LOI on a space. The architect's drawings are what you need for landlord review, permitting, and contractor pricing. The design cost is typically 3–8% of the total buildout budget, and it is money well spent because it protects your timeline and your negotiating position.

What is the difference between landlord work and tenant work?

Landlord work is the base building improvement (often called the "delivery condition")—things like the shell, core systems, and sometimes an improved floor. Tenant work is everything you add for your specific use. The lease defines who does what, and the TI allowance typically covers tenant work.

Can I negotiate for early access to the space before lease signing?

Yes, and you should. A 30–60 day early access period lets your contractor start pre-construction work—demolition, rough-in, measurements—before the lease is finalized. This can compress your post-signing timeline by 2–4 weeks.

Sources

• https://www.cbre.com/insights/figures/tenant-improvement-allowances
• https://www.jll.com/en/trends-and-insights/research/tenant-improvement-allowances
• https://www.architecturaldigest.com/story/commercial-buildout-cost-guide
• https://www.constructiondive.com/news/commercial-construction-permitting-times/600000/
• https://www.icsc.org/research-and-insights/retail-tenant-improvements
• https://www.osha.gov/construction
• https://www.irs.gov/publications/pub946
• https://www.agc.org/learn/construction-management
• https://www.boma.org/standards-guidance
• https://www.nar.realtor/commercial-real-estate/tenant-improvements

Related on PULSE

• How to Negotiate a Tenant Improvement Allowance
• Commercial Lease Terms Every Tenant Should Know
• Buildout Budgeting: A Step-by-Step Guide
• Permitting Timelines by City: What to Expect
• Choosing Between a General Contractor and Design-Build
• Rent Abatement Strategies for New Tenants