Commercial Tenant Improvement Cost Calculator

In 2026, a commercial tenant improvement (TI) or build-out typically costs $40 to $150+ per square foot, so most projects run between $30,000 and $200,000 depending on the size and scope — a light cosmetic refresh of a small space might be $20,000-$50,000, while a high-end restaurant or medical build-out of a larger space can exceed $300,000-$500,000+. The cost depends mainly on the space size (the square footage), the build-out level (a cosmetic/light refresh is cheapest; a standard build-out with partitions, finishes, and some MEP is typical; and a high-end build-out with extensive systems and premium finishes is the most expensive), the space type (office is the baseline; retail is slightly more; and restaurant or medical spaces cost much more due to heavy plumbing, specialized HVAC, equipment, and code requirements), and the existing condition (a second-generation space with reusable improvements is cheapest, a gray shell is typical, and a cold/dark shell needing full MEP from scratch costs the most). A tenant improvement (also called a build-out, fit-out, or TI) is the construction work to customize the interior of a leased commercial space (office, retail, restaurant, medical, etc.) to suit a tenant's needs — including partitions/walls, flooring, ceilings, lighting, electrical, plumbing, HVAC, finishes, fixtures, and any specialized requirements. It transforms a generic or previous-tenant space into the new tenant's functional space. Add-ons like a new HVAC system, an electrical service upgrade, adding plumbing/restrooms, architectural/engineering and permits, ADA compliance upgrades, and data/network cabling add to the total. This calculator lets you set the space size, build-out level, space type, and condition to estimate your project. Pricing varies by region, the size and scope, the space type, the condition of the existing space, code requirements, and the contractor. A light office refresh in a second-gen space is at the lower end, while a high-end restaurant build-out in a cold shell is at the higher end. TI is a significant investment that prepares the space for the business.

Gray shell, cold shell (or dark shell), and second-generation space describe the condition of a commercial space before a tenant build-out — they differ in how 'finished' the base space is, which significantly affects the build-out scope and cost. Understanding them helps you estimate the TI cost. Cold shell (dark shell): a cold shell is the most basic, unfinished condition — essentially a bare, empty space with just the core structure (the structural floor, exterior walls/windows, and roof). It typically has no interior finishes, no HVAC distribution (or no HVAC system), minimal or no electrical distribution, no plumbing (beyond stubbed utilities to the space, if that), no ceiling, no interior walls, and bare concrete floors. Building out a cold shell requires the most work (and cost) — you're installing all the MEP (mechanical/HVAC, electrical, plumbing) systems, the ceiling, lighting, walls, finishes — essentially everything — from scratch. It's the most expensive starting point. Gray shell (warm shell, vanilla shell variations): a gray shell is a more finished base than a cold shell, but still unfinished for the tenant — it usually includes the basic building systems brought to the space: HVAC system/distribution (or at least the main equipment), electrical service/panel, plumbing stubbed in, possibly a basic ceiling grid, finished/sealed concrete floors, and demising walls (the walls separating units). A 'vanilla shell/box' is a similar term for a basic finished space (often with finished walls, a ceiling, basic lighting, HVAC, and a restroom) ready for the tenant's specific finishes. Building out a gray/vanilla shell requires less work than a cold shell (the base systems are there) — you add the interior partitions, finishes, specific MEP connections, and fixtures. It's a middle-cost starting point (the typical baseline). Second-generation (2nd-gen) space: a second-generation space is one that was previously built out and occupied by a prior tenant — so it has existing improvements (walls, finishes, MEP, fixtures, often a previous use's layout). Building out a second-gen space can be cheaper if you can reuse the existing improvements (existing walls, restrooms, HVAC, electrical, some finishes) — you may just refresh/modify it rather than building from scratch. However, if the previous layout/use doesn't fit (e.g., converting a former restaurant to an office, or vice versa), it may require demolition of the existing improvements first (adding cost), so the savings depend on how well the existing build-out suits the new tenant. A good-fit second-gen space is the cheapest to build out; a poor-fit one may not save much. Cost implications: Cold shell — most expensive build-out (everything from scratch). Gray/vanilla shell — moderate (base systems present, add the tenant-specific work). Second-generation — potentially cheapest (reuse existing) if the layout/use fits, or moderate if demolition/reconfiguration is needed. The lease often specifies the delivery condition (what the landlord provides) and the tenant improvement allowance (TIA — money the landlord contributes toward the build-out). This calculator includes second-generation, gray shell, and cold shell condition options. So a cold shell is bare (most build-out needed), a gray shell has the base systems (moderate), and a second-generation space has prior improvements (cheapest if reusable). The starting condition greatly affects the TI cost — clarify the delivery condition in your lease. Know what you're starting with to estimate the build-out.

A tenant improvement allowance (TIA or TI allowance) is a sum of money that a landlord agrees to contribute toward the cost of building out or improving a leased commercial space for a tenant — it's a common part of commercial lease negotiations that helps offset the tenant's build-out costs. Understanding the TIA is important when budgeting a build-out. How it works: when a tenant leases commercial space that needs improvements/build-out to suit their business, the landlord often offers a TI allowance as an incentive and contribution. The allowance is typically expressed as a dollar amount per square foot (e.g., $30, $50, or $75+ per square foot of the leased space) or a lump sum. For example, a $40/sq ft TIA on a 2,000 sq ft space = $80,000 toward the build-out. The tenant uses this allowance to pay for (or offset) the construction/improvement costs. How it's provided: the TIA can be structured in different ways: Reimbursement — the tenant pays for the build-out and the landlord reimburses up to the allowance amount (often after the work is completed and documented). Landlord-managed — the landlord manages/pays for the build-out directly up to the allowance (with the tenant covering any overage). Rent credit/amortization — sometimes structured as rent credits or amortized into the rent. The specifics are negotiated and detailed in the lease. If the build-out costs more than the allowance: the tenant is typically responsible for any costs exceeding the TIA (the 'overage') — paid out of pocket, or sometimes negotiated as additional amortized rent. So if the build-out costs $150,000 and the TIA is $80,000, the tenant covers the remaining $70,000. This is why estimating the full build-out cost (vs. the allowance) is important — to know your out-of-pocket exposure. If the build-out costs less than the allowance: depending on the lease, unused allowance may be forfeited, applied to rent, or used for other improvements (varies by agreement). Negotiation factors: the TIA amount is negotiable and depends on the market conditions (a tenant's market vs. landlord's market), the lease length (longer leases often get higher allowances), the tenant's creditworthiness, the space condition, the rent rate, and the scope of improvements needed. A strong tenant in a soft market can negotiate a higher TIA. Why it matters: the TIA significantly affects a tenant's build-out budget and out-of-pocket cost — a higher allowance reduces what the tenant pays. When evaluating a lease and a space, factor in the TIA against the estimated build-out cost to understand your net cost. This calculator estimates the total build-out cost; you'd subtract any TIA to find your out-of-pocket portion. So a tenant improvement allowance is the landlord's contribution toward the build-out (often $X per square foot), negotiated in the lease, with the tenant covering any overage. Factor the TIA into your build-out budget. Negotiate the allowance, and estimate the full cost to know your net expense. The TIA offsets, but may not cover, the full build-out.

Responsibility for a commercial build-out cost is split between the landlord and tenant based on the lease negotiation — commonly, the landlord contributes a tenant improvement allowance (TIA) toward the cost, and the tenant pays the rest (and any overage), though the arrangement varies widely (from landlord-funded turnkey build-outs to fully tenant-funded). It's a key lease negotiation point. Common arrangements: Tenant improvement allowance (most common) — the landlord provides a TI allowance (a set amount, often per square foot) toward the build-out, and the tenant pays any costs above the allowance. This shares the cost: the landlord contributes (incentivizing the lease and improving their property), and the tenant covers the rest. The allowance amount is negotiated. This is the typical structure. Turnkey build-out — the landlord pays for and delivers the completed, built-out space ready for the tenant ('turnkey'), per agreed specifications/plans. The landlord covers the build-out cost (building it to suit), and the tenant moves in. This is more landlord-funded (often with the cost reflected in the rent). Common for standard build-outs the landlord manages. Tenant-funded — the tenant pays for the entire build-out themselves (with little or no landlord contribution), often in exchange for other concessions (lower rent, free rent period) or in a landlord's market. The tenant bears the cost (and often owns/benefits from the improvements during the lease). Rent considerations — build-out costs are often factored into the rent: a landlord providing a large allowance or turnkey build-out may charge higher rent (recouping the investment over the lease), while a tenant funding their own build-out may negotiate lower rent or concessions. The economics are interconnected. Factors affecting who pays: Market conditions — in a tenant's market (high vacancy), landlords offer more (higher allowances, turnkey) to attract tenants; in a landlord's market, tenants pay more. Lease length — longer leases justify larger landlord contributions (more time to recoup). Tenant strength — creditworthy, desirable tenants negotiate better terms. Scope — extensive/specialized build-outs (restaurant, medical) often involve more tenant funding (since they're tenant-specific), while generic improvements may be more landlord-funded. Ownership of improvements — typically, the improvements become part of the building (the landlord's property) at lease end, though some specialized items the tenant may remove. Negotiation: who pays (and how much) is negotiated in the lease, along with the TIA, rent, lease term, and concessions — it's all interconnected. Tenants should estimate the build-out cost, negotiate the allowance/terms, and understand their out-of-pocket responsibility. This calculator estimates the total build-out cost, which both parties use in negotiating the cost split. So a commercial build-out is typically a shared cost (landlord allowance + tenant pays the rest), but it ranges from landlord-funded turnkey to fully tenant-funded, depending on the negotiation and market. Negotiate the cost split and allowance in the lease. Estimate the full cost to negotiate effectively. It's a key part of the lease deal.

In most cases, yes — a commercial tenant build-out typically requires building permits, and often an architect (and engineers) for the design and drawings, because commercial construction involves code compliance, life-safety, accessibility (ADA), and systems work that must be designed and inspected. The exact requirements depend on the scope and jurisdiction. Permits: commercial build-outs almost always require building permits (and often separate trade permits for electrical, plumbing, mechanical/HVAC), because the work involves construction that must comply with building, fire, life-safety, accessibility, and zoning codes — and be inspected. Even relatively minor build-outs usually need permits (a simple cosmetic refresh with no construction might not, but most build-outs with walls, MEP, etc., do). The permitting process ensures the space is safe and code-compliant (important for occupancy). You'll need a Certificate of Occupancy (or completion) to legally occupy/operate. Pulling permits requires submitting plans. Architect/design professional: many commercial build-outs require an architect (and engineers) to design the space and produce the construction drawings needed for permitting and construction, because: Code/permit requirements — jurisdictions often require stamped/sealed drawings by a licensed architect (and engineers for structural, MEP) for commercial permits, especially for anything beyond minor work. The plans must show code compliance (egress, ADA, fire ratings, etc.). Complexity — commercial spaces involve life-safety (exits, fire systems), accessibility (ADA), MEP systems, and code requirements that need professional design. Specialized spaces — restaurants (health code, kitchen, grease, ventilation), medical (specialized requirements), and others need professional design for their specific codes. The architect designs the layout/space plan, ensures code compliance, produces the permit/construction documents, and may help with the permitting and construction administration. Engineers (structural, mechanical, electrical, plumbing) design those systems as needed. When you might need less: a very minor build-out (e.g., paint, carpet, minor non-structural changes with no MEP or egress impact) might not require an architect or full permits (a simpler process) — but most build-outs with construction do. Always check with the local building department. Why it matters: skipping required permits/professional design risks code violations, failed inspections, inability to get a Certificate of Occupancy (can't legally operate), safety hazards, fines, and problems with the landlord/lease. Proper permitting and design ensure a safe, legal, functional space. The cost: architectural/engineering fees and permit costs are part of the build-out budget (this calculator includes an architect/engineering + permits add-on). Process: typically, the architect/designer creates the space plan and construction documents, you submit for permits, the permits are issued, construction proceeds with inspections, and you obtain the Certificate of Occupancy. The contractor often helps coordinate permitting. This calculator includes an architectural/engineering and permits add-on, and ADA upgrades. So yes, most commercial tenant build-outs require permits and typically an architect (and engineers) for the design and code compliance — factor these into your budget and timeline. Professional design and permits ensure a safe, legal, occupiable space. Check your local requirements and the scope. They're an essential part of a commercial build-out.

A commercial tenant build-out typically takes anywhere from a few weeks to several months, depending on the size, scope/complexity, the space condition, permitting, and any specialized requirements — plus the design and permitting time before construction starts. A simple build-out might be 4-8 weeks of construction, while a large or complex one can take 3-6+ months. Construction timeline: Light/cosmetic build-out — a simple refresh (paint, flooring, minor changes) of a second-gen or finished space can be completed in about 2 to 6 weeks. Standard build-out — a typical office/retail build-out (partitions, finishes, MEP work) usually takes about 6 to 12 weeks (1.5-3 months) of construction, depending on the size. Large/complex build-out — a large space, a cold shell (full MEP from scratch), or a specialized space (restaurant, medical) takes longer — often 3 to 6 months or more for construction (extensive systems, specialized equipment, inspections). The full project timeline (including pre-construction): beyond construction, allow time for: Design — the architect/engineers designing the space and producing construction documents (several weeks to a couple of months, depending on complexity). Permitting — submitting for and obtaining permits, which can take weeks to a couple of months depending on the jurisdiction and scope (plan review times vary). This is often a significant lead time. Bidding/contractor selection — getting bids and selecting a contractor (a few weeks). So the total timeline from starting the design to occupancy is often several weeks to many months (e.g., a standard build-out might be ~3-5 months total including design and permitting, and a complex one 6-12 months). Factors affecting the timeline: Size — larger spaces take longer. Scope/complexity — more systems, custom work, and finishes take longer; a cold shell (everything from scratch) takes longer than a second-gen refresh. Space type — restaurants and medical spaces (specialized systems, equipment, health/code requirements, inspections) take longer. Permitting — plan review and permit issuance time (jurisdiction-dependent) is a major variable; complex projects need more review. Inspections — required inspections at stages add scheduling time. Long-lead items — special-order materials, equipment (HVAC, kitchen equipment), and fixtures with long lead times can delay completion (order early). Existing condition — surprises in the existing space (especially second-gen or older buildings) can add time. Coordination — coordinating the trades, the landlord, and any utility work. Landlord/lease — the lease terms, delivery date, and any landlord work affect the schedule. To keep it on track: start the design and permitting early (these have lead times), order long-lead items promptly, choose an experienced commercial contractor, and plan for inspections and potential surprises. Coordinate the move-in with the lease commencement. This calculator estimates the cost; the timeline depends on the scope, permitting, and complexity. So plan for a few weeks to several months for the construction (plus design and permitting lead time) — a simple build-out is quicker, while a large or specialized one takes months. Start early and account for permitting. Your contractor and architect can provide a project schedule. Permitting and long-lead items are common timeline drivers.