Interchangeable parts were vital to the introduction of the assembly line in the early 20th century, but they go back much further than that. Around 250 BCE, the city-state of Carthage had ships made with standardized, interchangeable parts. They even came with assembly instructions on how to remove an old part and replace it with the new. What worked for Carthage's shipyards may hold the answer for America's housing shortage: standardization at scale can solve supply problems fast.
America doesn’t have enough homes for its residents. According to the National Association of Realtors, the US has a deficit of 4.7M homes. The nation isn’t making strides to erase that deficit, either. Total housing construction is at its weakest point in six years, with single-family housing starts down 1.9% in May, and overall housing starts down 15.4%.
Limited housing supply can constrain community growth, making it harder for employers to attract workers and for families to remain in the communities where they want to live. For community financial institutions (CFIs), fewer housing projects can also mean fewer construction loans, mortgages, and opportunities to support local economic development.
What are Pre-Approved Building Plans?
A pre-approved building plan is a reusable set of design specifications already approved by a local government agency that makes it available to builders free or for a nominal fee.
Pre-approved building plans come in two main types:
- Pattern books: Municipality-published catalogs with multiple designs; used widely in South Bend, Indiana; Jackson, Michigan; Claremore, Oklahoma; and Seattle, Washington.
- Self-submitted / reuse plans: Builders submit previously approved plans for expedited re-permitting on future projects.
Risks that Pre-Approved Plans Help Neutralize for CFI Lenders
In addition to helping communities grow, pre-approved building plans can help neutralize risks for CFI lenders. These risks include:
• Permitting/approval delay risk. In Washington state, one study suggests that each month of permitting delay increases a project’s cost by 1%, or around $4,400. Delays can tack on $30K per unit in Seattle and $50K per unit in New York. With pre-approved building plans, projects spend less time in the pre-building phase. The design itself has already completed municipal review, reducing one major source of permitting uncertainty.
The permitting process may also be cheaper with a pre-approved building plan. Port Angeles, Washington has released a pattern book of pre-approved building plans as well as a fee waiver that saves developers who use permit-ready plans between $5K and $20K in permit, planning, and public works fees.
• Cost overrun risk. Each building happens in its own location, so it’s not possible to absolutely guarantee that even two identical constructions will carry the same price tag. That said, pre-approved plans make costs much more predictable and can reduce a contractor’s overall development cost by between 1% and 2%.
Cost overruns are eventually passed along to buyers, so reducing this risk is good for both the lender and the overall community, as it makes homes and businesses more affordable. The National Association of Home Builders estimates that for every extra $1K in a home’s price tag, more than 115K potential buyers can no longer afford it.
• Zoning and code violation risk. Builders spend less on architect fees and plan revisions necessary to meet municipal codes, because they can make those revisions once for multiple constructions.
• Contractor experience/execution risk. Underwriters and contractors are relying on a tested, proven blueprint. A contractor’s skill still matters, but it matters less when the builder relies on a vetted plan, not an untested design.
• Project abandonment/collateral risk. Projects that move faster, cost less money, and rely less on a builder’s virtuosity are more likely to break ground and go to completion.
CFI Lending Health and Positive Community Outcomes
Pre-approved plans don't change the fundamentals of credit underwriting — borrower strength, collateral, loan-to-value ratios, and market conditions remain central to every construction loan decision. What these plans can do is reduce some of the execution uncertainty that makes construction lending inherently complex.
When a project is built on a pre-approved plan, a lender has more confidence that the permitting phase won't stall and that the construction timeline in the pro forma isn't wishful thinking. Budget predictability improves too. A contractor's overall development cost may run 1–2% lower on a pre-approved plan, which narrows the gap between projected and actual costs. That's not a guarantee against overruns, but it's a meaningful input when evaluating how realistic a borrower's budget assumptions are.
At the community level, the downstream effects matter to CFIs as well. More affordable housing means more households can put down roots, which in tandem could mean more potential customers for deposit accounts, auto loans, and small business lending. As infill development reaches underserved neighborhoods, CFIs may also find expanded CRA lending opportunities in markets that previously lacked the development pipeline to support them.
Tips for CFIs to Leverage Pre-approved Plans in a Lending Program
- Know your local market's programs. Pattern books and reuse-plan programs vary by municipality. Understanding which jurisdictions in your footprint have active programs helps you identify where pre-approved plan projects are most likely to surface and where permitting timelines may be more predictable.
- Ask the right underwriting questions. When a borrower is building from a pre-approved plan, questions to consider include which program, which jurisdiction, and whether fee waivers apply. These details can meaningfully affect the project's cost structure and timeline assumptions.
- Treat pre-approved plans as one risk factor among many. A vetted plan may reduce design revision costs and permitting uncertainty, but it doesn't substitute for evaluating contractor experience, borrower financials, or local market absorption rates.
- Review the pro forma with the streamlined timeline in mind. If permitting is expedited, the carrying costs embedded in the borrower's pro forma should reflect that. A pro forma that still prices in long permitting delays may signal the borrower hasn't fully modeled the benefits or that they're padding contingencies.
- Support emerging builders. Pre-approved plans can lower the barrier to entry for smaller, less-experienced developers who may lack the capital to carry lengthy permitting delays. These are often the borrowers that large national lenders pass on and can be relationships where CFIs can add the most value.
- Monitor the draw schedule against the timeline. Faster permitting can compress the pre-construction phase, which means draws may come earlier than on a conventional project. Consider building that into your monitoring cadence so disbursements align with actual construction progress.
- Stay current on state and federal momentum. Several states are actively expanding pre-approved plan programs as part of broader housing affordability efforts. Lenders who track that policy landscape can anticipate where construction activity is likely to increase and can position their lending programs accordingly.
Pre-approved building plans can reduce the friction, cost, and uncertainty of the pre-construction phase. That directly benefits CFIs in assessing construction loan risk. As community lenders, CFIs are uniquely positioned to support the local contractors and small developers that use these programs. Large national banks aren't as nimble or as locally connected. Housing affordability and CFI lending health go hand in hand. Smarter construction leads to safer lending.
