Rental Property Walkthrough Checklist: What to Check Before You Offer

Introduction

A first walkthrough is not an inspection. It is a triage — twenty minutes to decide whether this property is worth an offer and an inspection fee, and to price the obvious.

TL;DR: Check the five expensive systems first — roof, HVAC, water heater, electrical panel, sewer — because those five decide whether a rehab budget is $15,000 or $60,000. Everything cosmetic can be priced later from photos. Bring a torch, a phone, and a willingness to open things.

What to bring

• Torch — basements, crawlspaces, under sinks, panels
• Phone for photos and voice notes
• Outlet tester (about $10)
• Tape measure
• Something to kneel on

Photograph every room, every mechanical system, every data plate with an age on it, and anything that looks wrong. You will price the rehab from these photos, not from memory.

The five that decide the budget

Check these before anything else. If two of them are at end of life, the rest of the walkthrough is optional.

Roof

• Age — ask, then verify against what you see
• Curling, cupping, missing or granule-bare shingles
• Number of layers visible at the edge — two layers means a tear-off
• Sagging ridge or dips in the plane
• Flashing at chimney, valleys, penetrations
• Gutters — attached, sloped, draining away from foundation
• Ceiling stains inside, especially upstairs and around chimneys

HVAC

• Data plate age on the outdoor unit and the furnace
• Run it — heat and cool, both
• Rust in the furnace cabinet or at the base
• Ductwork condition and whether every room has a register
• Filter — a filthy filter tells you about the whole property's maintenance
• Whether the system's capacity matches the square footage

Water heater

• Age from the serial number
• Corrosion at fittings, rust at the base, water on the floor around it
• T&P relief valve present with a discharge pipe
• Located where a failure would be expensive — above finished space is a risk

Electrical

• Panel capacity — 100A is workable, 60A means an upgrade
• Panel brand — Federal Pacific, Zinsco and Challenger are known-defective and often uninsurable
• Knob-and-tube or cloth-wrapped wiring visible in the basement or attic
• Aluminium branch wiring — common 1965–1973
• GFCI protection in kitchen, baths, exterior
• Test a few outlets; note two-prong outlets, which mean no ground

Plumbing and sewer

• Supply pipe material — copper, PEX are fine; galvanized and polybutylene are replacements
• Drain material — cast iron in a pre-1980 house is at end of life
• Run every tap, flush every toilet, check pressure with two running
• Under every sink — staining, active drips, patched traps
• Sewer lateral scope on anything pre-1980. This is the single most expensive surprise in residential, and the only way to see it is a camera.

Structure and water

• Foundation — cracks, and specifically anything horizontal or wider than a pencil
• Doors and windows that stick or will not latch, which suggest movement
• Floors visibly out of level
• Basement or crawlspace — moisture staining, efflorescence, musty smell, standing water
• Grading — does the ground slope away from the house
• Sump pump present and working, if the area needs one

Water is the root of most expensive problems. If the basement smells musty, believe your nose over the seller.

Rental-specific checks

Things a homebuyer would not think about and an investor must:

• Bedroom count that will actually appraise and rent — an egress window and a closet
• Separate utility meters, or a plan for who pays what
• Laundry — in-unit, hookups available, or nothing
• Parking, and whether it is adequate for the unit count
• Layout — a bedroom you walk through to reach another rents poorly
• Flooring that survives turnover; carpet in a rental is a recurring cost
• Condition of neighbouring properties, which sets the ceiling on rent

Age indicators worth knowing

Where the seller does not know the year, these date a property quickly:

Clue	Suggests
Knob-and-tube wiring	Pre-1950
Cast iron drains	Pre-1980
Galvanized supply	Pre-1960
Polybutylene (grey plastic)	1978–1995, replace
Aluminium branch wiring	1965–1973
Federal Pacific panel	1950s–1980s, replace
Popcorn ceiling	Pre-1980, possible asbestos
Painted surfaces, pre-1978	Assume lead

Red flags that end the visit

• Fresh paint on one basement wall only — usually covering water staining
• A brand-new sump pump in a house being sold "as is"
• Every window sealed shut or painted over
• Recent cosmetic work over obvious structural movement
• Seller refusing access to the basement, attic or crawlspace

None of these are automatically fatal. All of them mean the price has to reflect what you cannot see.

After the walkthrough

Price the work from your photos through the rehab cost calculator. If it is a flip, run the 70% rule calculator to set the offer; if a rental, the rental property ROI calculator at your real rehab number rather than an optimistic one.

Then, if you go under contract, the due diligence checklist covers the full document and inspection process — including the sewer scope, which is the one item worth paying for before anything else.

Conclusion

Twenty minutes on the five expensive systems tells you more than two hours admiring the kitchen. Photograph everything, note every data plate age, and price the property on what you found rather than what it looked like. The cosmetic work is cheap and visible; the roof, the panel and the sewer lateral are none of those things.