Commercial Tenant Improvement Cost Calculator

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 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 base rate is set by the build-out level (cosmetic/light ~$40/sq ft, standard ~$85/sq ft, high-end ~$150/sq ft), then adjusted by the space type (office is the baseline, retail ~5% more, and restaurant or medical ~40% more due to heavy plumbing, specialized HVAC, equipment, and code requirements) and the existing condition (a second-generation space with reusable improvements is ~15% cheaper, a gray shell is the baseline, and a bare cold shell needing full MEP from scratch is ~20% more). A ~$5,000 minimum applies. Add-ons — new HVAC, an electrical upgrade, added plumbing, architectural/permit fees, ADA upgrades, and data cabling — stack on top. Crucially, the landlord often contributes a tenant improvement allowance (TIA) that offsets part of this, so estimate the full cost to know your out-of-pocket. Enter your size, level, type, and condition above for a localized estimate.

These describe the condition of a commercial space before build-out, and the starting point dramatically affects the TI cost. A cold shell (or dark shell) is the most basic — a bare, empty space with just the core structure (structural floor, exterior walls, roof), no interior finishes, no HVAC distribution, minimal electrical, no plumbing beyond stubbed utilities, no ceiling, and bare concrete. Building it out means installing all the MEP (mechanical/HVAC, electrical, plumbing), ceiling, lighting, walls, and finishes from scratch — the most expensive starting point (this calculator adds ~20%). A gray shell (or warm/vanilla shell) is more finished: it typically includes the base building systems brought to the space — an HVAC system or distribution, an electrical panel, plumbing stubbed in, sometimes a basic ceiling grid and sealed floors, and the demising walls between units. You add the interior partitions, tenant-specific finishes, MEP connections, and fixtures — the middle-cost, typical baseline. A second-generation space was previously built out and occupied, so it has existing walls, finishes, MEP, and fixtures. It's the cheapest to build out (~15% less) if you can reuse those improvements, but if the previous layout doesn't fit — say converting a former restaurant to an office — demolition may erase the savings. The lease usually specifies the delivery condition and the TI allowance, so clarify what you're starting with. This calculator includes second-gen, gray shell, and cold shell options.

A tenant improvement allowance (TIA) is money the landlord agrees to contribute toward building out the leased space — a common lease-negotiation point that offsets the tenant's cost. It's usually expressed as a dollar amount per square foot (e.g., $30–$75+/sq ft) or a lump sum; a $40/sq ft TIA on a 2,000 sq ft space is $80,000 toward the build-out. It can be structured as a reimbursement (tenant pays, landlord repays up to the allowance), landlord-managed (landlord builds it out directly up to the allowance), or amortized into the rent. On who pays overall: the most common arrangement is the landlord provides a TIA and the tenant pays anything above it (the 'overage') — so if the build-out is $150,000 and the TIA is $80,000, the tenant covers $70,000 out of pocket. Other structures range from a landlord-funded 'turnkey' build-out (landlord delivers the finished space, often with higher rent to recoup it) to a fully tenant-funded build-out (often traded for lower rent or free-rent concessions). The economics are interconnected: a bigger allowance usually means higher rent. Market conditions (a tenant's vs. landlord's market), lease length, tenant creditworthiness, and the scope all shape the terms. This calculator estimates the total build-out cost — subtract any TIA to find your net out-of-pocket, which is exactly what you need to negotiate the lease effectively.

The type of business the space serves drives how much mechanical, electrical, and plumbing (MEP) work and specialized equipment the build-out needs, and that's where cost concentrates. An office is the baseline — mostly partitions, finishes, lighting, some data, and standard HVAC. Retail or showroom space is slightly more (~5%) for storefront work, display lighting, and higher-traffic finishes. Restaurant and medical spaces cost far more (~40% and up) because they're heavy on MEP and code: a restaurant needs commercial kitchen plumbing and gas, grease traps, powerful exhaust hoods and make-up air, extensive electrical, health-code finishes, and specialized equipment; a medical or dental space needs specialized plumbing, medical-gas or vacuum lines, extra electrical and HVAC for equipment, lead-lined or sterile rooms, and strict accessibility and code compliance. These specialized fit-outs can run $150–$400+/sq ft on their own. That's why the same square footage can cost three or four times more as a restaurant than as an office, and why restaurant and medical build-outs almost always need an architect and engineers. This calculator applies an office/retail/restaurant-medical multiplier so you can see the swing.

In most cases, yes — a commercial build-out typically requires building permits (and often separate electrical, plumbing, and mechanical permits), and usually an architect plus engineers to design the space and produce stamped construction drawings, because commercial work must comply with building, fire, life-safety, accessibility (ADA), and zoning codes and be inspected. Jurisdictions generally require licensed-architect (and engineer) stamped drawings for commercial permits on anything beyond minor work, since the plans must demonstrate code compliance — egress, ADA, fire ratings, and MEP design. Specialized spaces (restaurant health/kitchen code, medical requirements) especially need professional design. A very minor refresh — paint, carpet, non-structural changes with no MEP or egress impact — might avoid an architect and full permits, but most build-outs with walls, systems, or occupancy changes need both. Skipping required permits or design risks failed inspections, inability to get a Certificate of Occupancy (so you can't legally operate), code violations, fines, and lease problems. The typical process: the architect creates the space plan and construction documents, you submit for permits, permits issue, construction proceeds with staged inspections, and you obtain the Certificate of Occupancy. Architectural/engineering fees and permit costs are part of the budget — this calculator includes an architect/engineering + permits add-on and an ADA-upgrades add-on. Always check your local building department's requirements for your scope.

Several levers keep a build-out on budget. First, choose the space wisely: a well-fitting second-generation space that reuses existing walls, restrooms, and MEP can save 15%+ versus a cold shell that needs everything from scratch — so weigh a slightly higher rent for a better-finished space against the build-out savings. Second, negotiate the TI allowance hard, since it directly offsets your cost, and understand the delivery condition the lease promises. Third, keep the design efficient — an open plan with fewer private offices, standard-grade finishes, and a layout that reuses existing plumbing and electrical locations avoids expensive MEP relocation. Fourth, phase or value-engineer: build out only the space you need now, and substitute cost-effective finishes where they won't hurt the business. Fifth, engage a commercial contractor and architect early for accurate budgeting and to catch code issues before they become change orders, and order long-lead items (HVAC, kitchen equipment, custom millwork) promptly. Finally, get competitive bids and a clear scope to avoid surprise overages. The biggest cost drivers are the space type, the shell condition, and the MEP scope, so the earliest decisions — which space and how much systems work — matter most. This calculator lets you test how the level, type, condition, and add-ons move the total.

In most commercial leases, the tenant improvements become part of the building and belong to the landlord at the end of the lease — they're considered 'fixtures' permanently attached to the space. That means the walls, ceilings, lighting, built-in casework, HVAC, and most finishes you paid to install typically stay with the space when you leave, which is one reason landlords are often willing to contribute a TI allowance (the improvements enhance their property). There are important exceptions and nuances to negotiate in the lease. Trade fixtures — equipment specific to your business that's not permanently affixed (display shelving, certain equipment, signage) can often be removed by the tenant, but this should be spelled out. Restoration/surrender clauses — some leases require the tenant to remove certain improvements and restore the space to its original (or a 'broom-clean') condition at lease end, which can be a significant unexpected cost, so review the surrender obligations carefully. Amortized improvements — if improvements were financed through rent, the arrangement ends with the lease. Because these terms are negotiable and affect both your build-out investment and your exit costs, clarify in the lease what you can remove, what you must leave, and whether you must restore anything. This matters most for tenants making a large, specialized investment (like a restaurant or medical fit-out) they can't recoup. This calculator estimates the build-out cost; factor ownership and any restoration obligations into the total value of the investment.

A build-out typically takes anywhere from a few weeks to several months of construction, plus design and permitting lead time before that. A light/cosmetic refresh (paint, flooring, minor changes) of a second-gen or finished space can be done in about 2 to 6 weeks. A standard office or retail build-out (partitions, finishes, MEP work) usually takes about 6 to 12 weeks (1.5–3 months). A large space, a cold shell needing full MEP from scratch, or a specialized restaurant or medical fit-out takes longer — often 3 to 6 months or more. Beyond construction, budget time for the front-end steps: design (an architect and engineers producing construction documents — several weeks to a couple of months), permitting (submitting for and obtaining permits, which can take weeks to a couple of months depending on the jurisdiction and scope — often the biggest lead time), and bidding/contractor selection. So the total from starting design to occupancy is often several weeks to many months — a standard build-out might run ~3–5 months total including design and permitting, and a complex one 6–12. The main timeline drivers are permitting/plan review, long-lead items (HVAC, kitchen equipment, custom fixtures — order early), the shell condition, and the space type. Start design and permitting early, and coordinate move-in with the lease commencement so you're not paying rent on a space you can't yet occupy.