Property Inventory Calculator for Landlords

What this property inventory calculator does

Furniture, fixtures and appliances wear out. The August Property Inventory Calculator estimates what will need replacing, when, and how much to budget each year. Choose bedrooms and furnish level, set the average age of the current inventory, pick a planning horizon and inflation rate, then click Calculate. You’ll get:

• An Annual reserve (your sinking-fund target),

• Expected spend across the horizon,

• Next 12 months cost, and

• An Item schedule sorted by “next due”, with quantities, unit costs, lifespans, annual reserve, replacements in horizon and total cost.

Lifespans and costs are UK mid-market estimates. Always check tenancy obligations, keep receipts, and obtain quotes for exact pricing. Also see our article on how to make a property inventory. Ready to try August?

How the sinking fund calculation works

• Models by furnish level - Unfurnished, Part-furnished, Furnished adjust typical item lists and quantities automatically.

• Ages today’s inventory - Average current age forwards the schedule realistically. This is useful when you inherit a mixed-age portfolio.

• Looks ahead sensibly - Planning horizon (e.g., 3–10 years) shows totals and “replacements in horizon” so you can stage work.

• Inflation-aware - Inflation assumption indexes future costs so your reserve isn’t under-cooked.

• Clear sinking-fund math - The Annual reserve (straight-line) is the sum of (unit cost ÷ lifespan) × quantity across applicable items, inflation-adjusted where due.

• Actionable output - The table mirrors your UI: Item, Qty, Unit cost, Lifespan (yrs), Annual reserve, Next due (yrs), Replacements in horizon, Total cost in horizon.

Typical item lifespans for UK rental properties

These ranges reflect average UK rental use. Heavy use or poor ventilation shortens life; good care extends it.

• Lighting bulbs/LEDs - 1–3 yrs. LEDs last longer, but still budget a small annual amount.

• Shower sets/hoses & seals - 2–5 yrs. Limescale and hard water accelerate wear.

• Paint & décor (whole unit) - 4–7 yrs depending on tenancy turnover and colour choice.

• Carpets/vinyl/laminate - 5–10 yrs Durable, mid-tone, bleach-cleanable carpets reduce replacements.

• Smoke/CO alarms - 7–10 yrs. Swap sealed-unit alarms at manufacturer end-of-life. Test regularly.

• White goods - Washing machine 6–8 yrs. Fridge/freezer 8–10 yrs. Cooker/oven 8–12 yrs. Hob 10–12 yrs. Dishwasher 6–8 yrs.

• Boiler (combi/system) - 10–15 yrs. Service annually and budget earlier for heavy-use HMOs.

• Curtains/blinds - 6–9 yrs. Blinds often outlast curtains in kitchens/bathrooms.

• Mattresses/bed frames (furnished) - 5–7 yrs. Use protectors and keep delivery/collection notes.

• Soft furnishings & small electrics - 3–5 yrs. Replace to protect presentation and reviews.

Fair wear and tear applies. Replacements should be like-for-like quality. “Betterment” or upgrading far beyond the original, is not usually deductible from deposits.

Worked example: 2-bed unfurnished property over 5 years

Inputs - 2 bedrooms, Unfurnished, Average current age = 0 yrs, Planning horizon = 5 yrs, Inflation = 3%.
Click Calculate.

You might see:

• Annual reserve (straight-line) - £797

• Expected spend (5-year horizon) - £1,313

• Next 12 months cost - £41

Schedule highlights (ordered by Next due):

• Lighting bulbs (annual) - reserve £40/yr; multiple occurrences in horizon.

• Shower set (head/hose) - due in ~4 yrs; reserve £11/yr.

• Paint & décor (whole unit) - due in ~5 yrs; reserve £180/yr.

• Carpets (whole unit) - due ~7 yrs; reserve £171/yr.

• …plus alarms, white goods, boiler and cooking appliances with later due dates.

Use this as a sinking fund guide. Update item ages after each replacement and re-run the calculation before renewal season.

Replacement of domestic items: what landlords can claim

When you replace furniture, furnishings or appliances in a furnished letting, the cost of the replacement item (on a like-for-like basis) is deductible against your rental income under HMRC's Replacement of Domestic Items (RODI) relief. This replaced the old wear-and-tear allowance in 2016 and applies to all residential landlords who provide moveable household items, sofas, beds, white goods, curtains, carpets and similar.

The relief applies to the replacement cost, not the original purchase, and is limited to the equivalent modern substitute where you upgrade significantly. Keeping a clear record of item ages, condition at installation and replacement receipts is therefore both a deposit dispute safeguard and a tax record. The calculator's item schedule, with unit costs, installation dates and next-due estimates, provides exactly the documentation structure that makes RODI claims straightforward. Our guide to allowable expenses for landlords explains the full rules governing RODI and the distinction between repairs and improvements that determines which costs are deductible.

Practical tips: evidence, bundling and deposit adjudications

• Specify durable finishes - Mid-tone paint, vinyl in wet zones, hard-wearing carpets reduce frequency and disputes.

• Keep evidence - Photos, invoices, model numbers and installation dates stored in August help with warranties and deposit adjudications.

• Bundle replacements - Group décor + minor repairs during voids to cut labour and reduce tenant disruption.

• Plan for compliance items - Smoke/CO alarm replacement cycles and manufacturer end-of-life dates should sit in your August reminders.

• Price your time - If you self-manage, include your labour or logistics cost in cash flow planning to keep comparisons honest.

How to use the August Property Inventory Calculator

1. Select Number of bedrooms and Furnish level (Unfurnished / Part-furnished / Furnished).

2. Enter the average current age of items (in years), set a planning horizon, and add an inflation assumption.

3. Click Calculate to see Annual reserve, Expected spend, Next 12 months cost and the Item schedule ordered by next due.

4. Re-run after each replacement or at tenancy renewal to keep the plan fresh.

Knowing when items need replacing helps you budget accurately and reduces the risk of deposit disputes at the end of a tenancy. Our article on DPS vs TDS vs myDeposits explains which government-approved deposit protection scheme to use and how each handles deductions, while our guide to allowable expenses for landlords covers which replacement costs can be claimed against your rental income.

Disclaimer

The Property Inventory Calculator is provided for general information and planning purposes only. It uses typical UK lifespans, costs and simple assumptions. August can not guarantee calculations are complete, current or accurate for every property or circumstance.

This tool is not a substitute for tenancy agreements, manufacturer guidance, safety standards, insurer or lender requirements, or professional advice. Results are indicative and may differ from outcomes based on actual wear, usage, local pricing and contractor quotes. We accept no liability for decisions made using this tool.