Creating a Successful Self-Storage Construction Budget

Developing a self-storage facility, whether it’s your first, your fifth or your fiftieth, requires careful cost management and a strong financial strategy. In short, you need a well-structured construction budget. This accomplishes three important things:

Lender confidence: Banks require a clear cost breakdown and contingency planning before approving funding.
Cost control: Your budget serves as the benchmark for bids, draws and change orders.
Feasibility and returns: Construction costs per rentable square foot directly impact break-even occupancy and internal rate of return.

A good budget—ands a thorough understanding of each of its components—will also help you navigate potential challenges like delays, cost overruns, lender issues and economic slowdowns. This article will help you create one that’s dependable and repeatable, so you can ensure your self-storage project stays on course.

The Importance of Price Per Square Foot

Standardizing your self-storage construction budget into line items tied to price per square foot (PSF) allows you to model projects consistently and compare performance across locations. Appraisers often rely on industry guides that use that figure as a basis, so aligning your budget with this standard ensures everyone is working from the same framework.

For your standardized line items, it’s best to match your budget to your construction sworn statement. This allows you to update items directly when contractors provide quotes and keep everything aligned. This uniformity also simplifies project organization once construction begins and makes it easier to adjust projections as needed.

It’s also important to adapt your self-storage construction budget based on quotes from reputable general contractors (GCs). For instance, during the COVID pandemic, steel prices surged significantly, requiring adjustments based on real-time pricing rather than industry standards.

What a Construction Budget Should Include

At a high level, your self-storage construction budget should include hard costs (physical construction) and soft costs (services and fees). Below is a PSF-based, hard-cost framework, which typically runs between $65 and $85 PSF of the gross building area (GBA).

Soft costs, which typically range from 15% to 25% of hard costs, are an essential part of any construction budget, even though they aren’t driven by cost PSF. They include architecture and engineering expenses, permits and impact fees, legal and accounting services, construction interest, appraisal and lender fees, insurance, and, if applicable, a development fee. While these items may not directly contribute to the physical construction of the self-storage project, they’re critical to ensuring it’s properly designed, approved, financed and protected throughout its lifecycle.

Contingency Coverage

When preparing your self-storage construction budget, there are a few other key considerations to keep in mind, including contingencies. They’re typically set between 3% and 5%, but I recommend negotiating for closer to 10% with your lender, especially if interest rates are low. A higher contingency provides a safety net for unexpected costs and reflects positively on your performance if you come in under budget. It also eliminates the need for lender review in the event of a true cost overrun.

Additionally, a larger contingency can create opportunities for upgrades. For example, I once had a self-storage project in which we preleased nearly all of our initial expansion. Using the contingency, I was able to construct most of another building without requiring additional lender approval, as the expense was already included in the approved budget.

Another consideration is the GC fee. If you’re a licensed builder or contractor who’s managing the self-storage development, you may be able to pay that fee to yourself out of the contingencies. Confirm this arrangement with your lender to ensure compliance.

How to Keep Your Plan on Track

Engage the right team early. Start by working with an architect and civil engineer to create accurate self-storage site plans and schematics. Involve a GC early on to provide real-world pricing and scheduling insights, which can help refine your construction budget and timeline. It’s also important to coordinate with your lender to review the budget and ensure draw requirements are clearly defined. Additionally, consider hiring a third-party estimator, especially if your GC is still in the pre-construction phase, to provide an unbiased cost assessment and ensure your budget aligns with industry standards.

Bid competitively, but realistically. Don’t underbudget your self-storage project. Use actual quotes from subcontractors or historical comparatives from previous projects.

Use a draw schedule that mirrors your budget. It’s important to understand the lender’s timeline for approving money draws. For instance, if the lender says it’ll take the inspector seven days to review and approve a draw, I ask my GC to bill me for seven days in advance—provided I trust them.

Track cost PSF monthly. This means monitoring how much you’re spending on construction relative to the total square footage of the self-storage development. For example, if your GBA is 84,000 square feet and your current construction costs are $2.1 million, dividing the total cost by the square footage gives you a cost of $25 per square foot to date. This allows you to evaluate if your project is staying on budget, so you can identify potential cost overruns.

What Can Go Wrong (And How to Handle It)

Self-storage construction projects, especially those involving outdoor-access units on large sites, are rarely perfect and often face unplanned challenges. Here are just a few:

Weather is a significant factor, particularly if your concrete or steel is scheduled to arrive during the winter or rainy season. In these cases, plan for additional site preparation, such as having your excavator ready to clean up the pad or laying down tarps. Severe weather can lead to unexpected costs, as I experienced when steel was delivered during a week where we received 30 inches of snow. We had to expense its removal while ensuring there wasn’t a thin layer of ice on the pad before placing the steel.

Permit delays and impact fees are another common issue, as cities often postpone approvals or introduce surprise costs. To mitigate this, engage the city early in the process and ask which civil engineers and contractors they prefer to work with. While it may cost more to hire professionals the city favors, it can save time and reduce complications later.

Steel-price volatility is a risk, especially for pre-engineered metal buildings, as tariffs or shortages can cause sudden price spikes. Locking in pricing early with your GC or steel supplier is a safer approach, even if it means paying a slightly higher price upfront.

Change orders due to poor plans can be costly, as GCs will fill in gaps in the drawings, usually at your expense. To avoid this, hire a construction manager or owner representative to review the plans thoroughly before final bids are submitted.

When disagreements arise between contractors and engineers, I’ll trust my contractors but still ensure both parties have a chance to speak up if they notice issues. Additionally, I rely on my excavators to act as my eyes and ears on site, helping to identify potential problems early. By anticipating these challenges and taking proactive measures, you can minimize disruptions and keep your self-storage project on track.

Budgeting Strategies for First-Time Builders

For inexperienced self-storage developers, careful financial planning is essential to ensure project success and avoid costly mistakes. Below are a few key strategies to keep in mind:

Use GBA, not net rentable square footage, for your PSF. Construction costs are based on what you build, not the amount of self-storage space you ultimately rent out.
Standardize your template across projects. A consistent budgeting template helps keep your team, lender and GC aligned and minimizes confusion.
Don’t skip soft costs. Lenders and investors expect a comprehensive budget that includes all expenses, not just the slab and steel.
Contingency isn’t a luxury, it’s protection. Avoid the temptation to reduce contingency funds to improve underwriting, as they’re essential for managing unexpected costs.
Review actuals vs. budget monthly. Treat your self-storage project like its own business. Regularly compare actual expenses to your budget to stay on track and make informed decisions.

Creating a construction budget for a self-storage facility isn’t about estimating what the building might cost, it’s about actively managing and controlling what the building should cost. By using PSF budgeting as your framework, aligning your line items with a contractor's sworn statement and working with experienced professionals, you can ensure your self-storage project stays on track and within budget.

Charlie Kao is the principal of Twin Oaks Capital, a Michigan-based commercial real estate company specializing in self-storage and multi-family assets. Services include real estate brokerage, asset management, feasibility studies, consulting and construction management. The company and its affiliates have owned, operated or planned more than 1 million square feet of self-storage. Charlie also owns House of Kaos Real Estate School, which provides continuing education credits for licensed realtors. He can be reached at [email protected].

About the Author

Charlie Kao

Principal, Twin Oaks Capital

Charlie Kao is the principal of Twin Oaks Capital, a Michigan-based commercial real estate company specializing in self-storage and multi-family assets. Services include real estate brokerage, asset management, feasibility studies, consulting and building-construction management. The company and its affiliates have owned, operated or planned more than 1 million square feet of self-storage. Charlie also owns House of Kaos Real Estate School, which provides continuing education credits for licensed realtors. He can be reached at [email protected].

See more from Charlie Kao

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