{
    "name": "Property Maintenance Reserve Calculator",
    "url": "https://calculators.geekmidst.com/calculators/property-maintenance-reserve-calculator",
    "markdown": "https://calculators.geekmidst.com/calculators/property-maintenance-reserve-calculator.md",
    "category": "Real estate",
    "description": "Plan a repair reserve for a home or rental by percentage of value, by floor area, or by listing components with their replacement cost and remaining life.",
    "summary": "A maintenance reserve spreads the cost of repairs and replacements over the years before they fall due. The component method is the most precise; the other two are quick rules of thumb.",
    "also_called": [
        "Replacement reserve calculator",
        "Home maintenance budget calculator",
        "CapEx reserve calculator"
    ],
    "applies_to": "Worldwide",
    "last_updated": "2026-10-29",
    "computation": "Results are computed in the visitor’s browser on the HTML page. This API describes the calculator; it does not compute results.",
    "inputs": [
        {
            "name": "method",
            "label": "Method",
            "type": "select",
            "default": "percent",
            "options": {
                "percent": "Percentage of property value",
                "area": "Amount per unit of floor area",
                "components": "Component list (cost ÷ years left)"
            }
        },
        {
            "name": "value",
            "label": "Property value",
            "type": "number",
            "default": "350000",
            "shown_when": {
                "method": "percent"
            }
        },
        {
            "name": "pct",
            "label": "Reserve per year",
            "type": "number",
            "default": "1",
            "unit": "% of value",
            "shown_when": {
                "method": "percent"
            }
        },
        {
            "name": "area",
            "label": "Floor area",
            "type": "number",
            "default": "1800",
            "unit": "sq ft or m²",
            "shown_when": {
                "method": "area"
            }
        },
        {
            "name": "area_rate",
            "label": "Reserve per year per unit of area",
            "type": "number",
            "default": "1",
            "shown_when": {
                "method": "area"
            }
        },
        {
            "name": "components",
            "label": "Components (one per line: name: replacement cost, years until replacement)",
            "type": "textarea",
            "default": "Roof: 12,000, 20\nHVAC: 8,000, 15\nWater heater: 1,500, 10\nExterior paint: 4,000, 8",
            "shown_when": {
                "method": "components"
            }
        },
        {
            "name": "currency",
            "label": "Currency",
            "type": "currency",
            "default": "USD"
        }
    ],
    "outputs": [
        {
            "key": "annual_reserve",
            "label": "Set aside per year",
            "format": "currency"
        },
        {
            "key": "monthly_reserve",
            "label": "Set aside per month",
            "format": "currency"
        },
        {
            "key": "ten_year_reserve",
            "label": "Reserve over 10 years",
            "format": "currency"
        },
        {
            "key": "basis",
            "label": "Basis",
            "format": "text"
        }
    ],
    "formula": {
        "text": "Percentage: Reserve = Value × Rate;  Area: Reserve = Area × Rate per unit;  Components: Reserve = Σ (Replacement cost ÷ Years until replacement)",
        "variables": {
            "Replacement cost": "today’s cost to replace the component",
            "Years until replacement": "remaining useful life"
        }
    },
    "worked_example": {
        "inputs": {
            "method": "components",
            "value": "350000",
            "pct": "1",
            "area": "1800",
            "area_rate": "1",
            "components": "Roof: 12,000, 20\nHVAC: 8,000, 15\nWater heater: 1,500, 10\nExterior paint: 4,000, 8",
            "currency": "USD"
        },
        "steps": [
            "Roof 12,000 ÷ 20 = 600; HVAC 8,000 ÷ 15 = 533.33.",
            "Water heater 1,500 ÷ 10 = 150; paint 4,000 ÷ 8 = 500.",
            "Total = 1,783.33 a year, or 148.61 a month."
        ],
        "result": "Setting aside about 1,783 a year (149 a month) funds these four replacements by the time each is due."
    },
    "interpretation": "The component reserve covers big planned replacements; routine repairs come on top. If you already have savings earmarked for a component, subtract them from its cost.",
    "assumptions": [
        "Replacement costs are in today’s money; no inflation or interest on the reserve is applied.",
        "Rule-of-thumb rates are starting points, not standards."
    ],
    "limitations": [
        "Unexpected failures and routine upkeep are not predicted by the component list."
    ],
    "rules": null,
    "faqs": [
        {
            "question": "What is the 1% rule?",
            "answer": "A rule of thumb that a home needs about 1% of its value in maintenance each year. It ignores age, climate and construction, so treat it as a rough floor."
        },
        {
            "question": "Should the reserve include inflation?",
            "answer": "For long-life items it helps to raise the cost by expected inflation; the Inflation Calculator can estimate the future cost."
        }
    ],
    "sources": [],
    "related": [
        {
            "name": "Net Rental Yield Calculator",
            "url": "https://calculators.geekmidst.com/calculators/rental-yield-net-calculator"
        },
        {
            "name": "Property Tax Estimate Calculator",
            "url": "https://calculators.geekmidst.com/calculators/property-tax-estimate-calculator"
        },
        {
            "name": "Savings Goal Calculator",
            "url": "https://calculators.geekmidst.com/calculators/savings-goal-calculator"
        },
        {
            "name": "Inflation Calculator",
            "url": "https://calculators.geekmidst.com/calculators/inflation-calculator"
        }
    ],
    "disclaimer": "This calculator gives estimates for planning. It is not financial advice, and lenders’ actual terms, fees and rounding may differ.",
    "publisher": "GM¹X CalcVerse"
}