Foundry Underwriting Tool · Free self-service preliminary model

Explore your buying power or evaluate a property.

Build a preliminary STR underwriting model using your own assumptions. Test the purchase, financing, setup and operating numbers behind a possible acquisition, even if you're starting with rough figures.

This tool organizes the assumptions you supply. It does not verify revenue, regulations, operating expenses, financing terms, comparable properties or local operating conditions, and it is not a Foundry Underwrite. For independent research and a written recommendation, start with a Foundry Screen ($100 introductory price) or request a Foundry Underwrite ($500 introductory price). See Services & Pricing for the difference.

This model is educational and preliminary. It is not legal, tax, lending, appraisal or investment advice. Results depend entirely on the assumptions you enter. Your inputs are stored only in this browser unless you choose to send them. Permit eligibility, insurance, financing and taxes require appropriate professional confirmation.

What the Foundry Underwriting Tool does

This self-service tool needs JavaScript to run interactively. Here's a summary of what it covers.

Two starting points

Explore My Buying Power — start with your available cash and financial limits to see what purchase price those constraints may support, and what the property would need to earn.

Evaluate a Property — start with a listing or purchase price and see what the acquisition, operating and revenue assumptions produce.

What it asks for

Cash available, reserve to retain and maximum monthly contribution; purchase price, down payment, interest rate and loan term; a repairs/furnishing/launch budget; revenue as either annual gross accommodation revenue or ADR × occupancy; and management fee, platform fee and combined fixed annual operating costs.

What it returns

Opening cash required, the minimum modeled annual revenue needed to stay within your stated monthly contribution limit, planning-case monthly operating result, operating break-even revenue, and a conservative/planning/optimistic revenue stress test. These calculations reproduce the assumptions entered — they do not establish that the revenue, resale, permit or operating assumptions are achievable.

Beyond the free tool

Foundry Screen: Market & Property Screening, $100 introductory price. An independent first-pass screen of one specific property: AirDNA-supported revenue range and comparables, market and seasonality snapshot, initial permit and regulatory screen, property-level red flags and a written advance, reconsider or stop conclusion.

Foundry Underwrite: Complete STR Financial Underwriting, $500 introductory price. Everything in the Foundry Screen, plus a complete acquisition and capital model, financing, operating expenses, scenarios, sensitivity analysis, the Foundry Score, a ten-year hold posture and a written recommendation.