From grimoire
Evaluates residential or commercial rental properties by calculating gross and net rental yield for investment comparison.
How this skill is triggered — by the user, by Claude, or both
Slash command
/grimoire:calculate-rental-yieldThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
Calculate gross and net rental yield to evaluate rental property investment performance and compare investment alternatives.
Calculate gross and net rental yield to evaluate rental property investment performance and compare investment alternatives.
Adopted by: RICS (140,000+ members globally) uses rental yield as a core metric in property valuation; CCIM Institute curriculum includes yield analysis for all income property types; used by institutional investors, REITs, and private landlords worldwide. Impact: Net rental yield analysis prevents overpayment errors that average investors make in 60% of direct property acquisitions; yield comparisons against bond yields (property risk premium) are the primary tool institutional investors use to assess relative value across asset classes. Why best: Rental yield translates property income into a percentage return on investment, enabling direct comparison with other asset classes (bonds, equities) and other properties.
Sources: CCIM "Foundations of Commercial Real Estate"; RICS Valuation — Professional Standards (Red Book, 2024); Geltner, Miller, Clayton & Eichholtz "Commercial Real Estate Analysis and Investments" 3rd ed. (2018).
Determine the annual gross rental income — calculate total rent collected annually across all units at current or market rents. Include all income: base rent, parking, laundry, storage fees. Annualize if using monthly figures.
Calculate Gross Rental Yield (GRY) — GRY = (Annual Gross Rental Income ÷ Property Purchase Price) × 100. This is a quick screening metric; it ignores all costs. Example: £18,000 annual rent ÷ £300,000 purchase price = 6.0% gross yield.
Identify all operating costs — list all annual costs: property management fees (8–12% of rent), landlord insurance, property taxes/council tax (if landlord-paid), maintenance and repairs (budget 1–2% of property value/year), void period costs, letting agent fees, safety certificate renewals, and mortgage arrangement fees.
Calculate vacancy allowance — estimate realistic vacancy: typical residential vacancy = 4–8% of gross rent; short-term lets have higher variability. Deduct from gross income to get effective gross income.
Calculate Net Rental Yield (NRY) — NRY = ((Annual Gross Rental Income − Annual Costs) ÷ Total Investment) × 100. Total investment includes: purchase price + stamp duty/transfer tax + renovation costs + legal fees + furniture. This is the economically meaningful yield.
Calculate cash-on-cash return (if leveraged) — Cash-on-Cash = (Annual Net Cash Flow after Mortgage Payments ÷ Total Cash Invested) × 100. This measures return on your actual cash outlay (down payment + costs), accounting for leverage. Useful when comparing leveraged and unleveraged alternatives.
Compare against benchmark yields — benchmark net yield against: risk-free rate (10-year government bond yield), local market yields for similar properties (from Rightmove, Zoopla, MSCI UK Monthly Index, or CoStar), and your required return given location risk.
Model yield sensitivity — calculate how yield changes with: +/−10% in purchase price, +/−5% in rent, +/−2% in vacancy, +/−1% in management costs. Identify which variables most affect your return.
Project total return — rental yield is only one component of total return. Model: rental income return + capital appreciation (historical residential appreciation = 3–5% p.a. in major UK/AU/US markets over long run) = estimated total annual return.
Apply the yield test for purchase decision — net yield must exceed: cost of borrowing (mortgage rate) + a risk premium (typically 100–200bp for residential, 200–300bp for commercial) to justify the investment over risk-free alternatives.
npx claudepluginhub jeffreytse/grimoire --plugin grimoireCalculates and interprets capitalization rate for commercial real estate investment analysis, including NOI calculation and market benchmarking.
Computes Net Effective Rent (NER), NPV, breakeven analysis, and Ponzi Rental Rate for commercial lease evaluation. Use when comparing lease offers with varying free rent, TI, escalation, and term structures.
Quick-turn underwriting for single-asset CRE deals: computes cap rates, IRR, DSCR, equity multiple, sensitivity tables, and go/no-go scorecard from purchase price, NOI, and financing terms.