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    Repair then flip: how to judge an item with a problem

    A specific problem to investigate, fix, test and disclose — and the numbers that say whether it is worth it.

    In short

    Repair-then-flip means buying something with a known problem, fixing it properly, testing it, and selling it with the repair disclosed. It only works when the fault is confirmed before you pay, the procedure is within your skills and tools, and the numbers still work if something goes wrong. “Untested”, “for parts”, “für Bastler” and “probably just the battery” are not faults. They are uncertainty, and uncertainty has a price.

    Estimate your maximum offer
    • A low price is not evidence of an easy repair. It is evidence that the seller wants it gone.
    • Keep six things apart: what the seller says, how far it is verified, what work is needed, how hard it is, how sure the diagnosis is, and how much safety depends on it.
    • “Straightforward” belongs to a product, a confirmed fault and a procedure — never to a listing.
    • A cheap part is not the same as an easy installation. Diagnosis time comes before repair time.
    • Sometimes the most useful answer is: do not buy this one.

    Two ways to buy

    Ready to resell

    A working item whose condition you can verify well enough before paying. The work is optional: cleaning, completing it with a correct accessory, better photos, a better description, bundling. Nothing has to be diagnosed.

    Repair then flip

    An item with one specific problem that you can confirm, fix with a known procedure, test afterwards and describe honestly. If you cannot name the fault, it is not yet a repair project — it is a diagnosis project, and may be neither.

    Repair then flip

    1. 1. Choose a category that fits you

      Skills, tools, budget, space, transport and time. The topic hub shows what each category demands, and the optional selector filters by what you have.

    2. 2. Read the listing as claims, not facts

      Note the seller’s exact words. Decide what is claimed, what is shown, and what nobody knows.

    3. 3. Turn the symptom into a confirmed fault — or don’t

      Use the guide’s fault table: plausible causes, safe checks, evidence to ask for. If the cause stays open, the item is a diagnosis job.

    4. 4. Check the procedure is within reach

      Accessible parts, bounded steps, tools you own, clear compatibility, and a function test that proves the result.

    5. 5. Run the all-in numbers

      Every cash cost, your own hours separately, three scenarios. The adverse case has to be survivable.

    6. 6. Find candidates with honest search phrases

      Seller phrases find listings. They do not verify them. Apply steps 2 to 5 to whatever you find.

    7. 7. Repair, test, disclose

      Do the function test. Then tell the buyer what was wrong, what you did and what you did not check.

    Condition, kept in separate fields

    A single “condition” label hides the things that decide the price. FlipGap keeps them apart:

    Seller-reported condition and the quote
    The seller’s own words, kept verbatim: “untested”, “worked when last used”, “für Bastler”. Negation and context stay intact — “not for parts” is the opposite of “for parts”.
    Verification
    Seller claim, evidence supplied (video, report, invoice), independently checked, or unknown. A claim does not become evidence by being repeated.
    Work required
    None; cleaning or completing; routine maintenance; repair of a confirmed fault; diagnosis needed first; or parts and salvage only.
    Repair difficulty, tools and skills
    For the confirmed fault and the actual procedure — not for the category, and not for the best case.
    Diagnostic confidence and open alternatives
    Confirmed, plausible or open — plus the other causes that have not been ruled out. A seller’s guess makes a cause plausible at most.
    Safety significance and checks after the work
    Whether someone can be hurt if the repair is wrong, and which function test has to pass before the item is sold.

    Potentially straightforward if this fault is confirmed

    FlipGap only ever says “potentially straightforward if this fault is confirmed”, and only when all five hold for that product, fault and procedure:

    • The parts involved are accessible without dismantling sealed or safety-critical assemblies.
    • The procedure has a bounded number of steps, described by the maker or a credible repair reference.
    • It needs only tools an ordinary household or hobby workshop has.
    • Part compatibility can be established from identifiers on the item.
    • A meaningful function test exists that shows whether the repair worked.

    Diagnosis time is shown separately from repair time, because finding the fault is often the longer part. No listing, price or seller statement can earn the label.

    Seller phrase

    Sellers use a small set of phrases when something does not work, or when they do not know. Each phrase is a way to find listings and a reason to ask questions — not a diagnosis, and not a sign of an easy profit.

    Seller phraseWhat it signals
    “spares or repair”Seller expects work or parting out. Says nothing about what is wrong.
    “for parts”Seller expects work or parting out. Says nothing about what is wrong.
    “not working”Seller says it does not work. The cause is unknown unless evidence shows it.
    “untested”Nobody has checked. It may work, or it may not — price it as unknown.
    “non-runner”Does not start or run. Anything from a flat battery to a seized engine.
    “won't start”Does not start or run. Anything from a flat battery to a seized engine.
    “project bike”Seller expects work or parting out. Says nothing about what is wrong.
    “been sitting”Stored for a long time. Expect several age-related problems at once.
    “don't know what's wrong”The seller does not know what is wrong. Neither do you, yet.

    an uncertainty signal, not a diagnosis “For parts” can mean irreparable, incomplete, or no longer suitable for road use. Ask which.

    Specific opportunities

    Each one is a product, a confirmed fault and a procedure. None of them is a claim that the fault is common, cheap or profitable.

    Research candidate — not published guidance

    • Office chair that sinks (gas lift) · Evidence still missing: No manufacturer procedure for removing a pressurised gas cylinder has been verified for any chair model. A model-specific service document, with its safety warnings, is needed before any guidance is published.
    • Petrol lawnmower with a diagnosed starter-cord fault · Evidence still missing: The engine maker sells a starter rope kit with a rewind tool, but we have not verified an official step-by-step procedure with a recoil-spring warning for a named engine family.
    • Garden tool needing a handle, knob, spool or wear part · Evidence still missing: Wear-part procedures differ by machine. No model-specific manufacturer instructions have been verified yet, so only the inspection limits on this guide are published.
    • MIDI controller missing an adapter, cable, knob or accessory · Evidence still missing: Adapter voltage and polarity, and knob-shaft compatibility, are model-specific. No manufacturer specification pages have been verified for a launch set of models.

    Where DIY stops

    Some categories are never presented as generic beginner repairs here, whatever the price:

    Child-safety equipment
    Car seats, cots, stair gates, high chairs. History cannot be verified, standards change and recalls are frequent. Do not repair for resale.
    Helmets and protective gear
    One impact can destroy the protection invisibly. Do not resell used helmets as protective equipment.
    Recalled products
    Check the official recall database for your country before buying. A recalled item that has not been remedied should not be sold.
    Microwave ovens and CRT screens
    They hold dangerous voltages after unplugging. No internal work.
    Refrigerant circuits
    Fridges, freezers, air conditioners, heat pumps, dehumidifiers. Sealed-system work is legally restricted to certified technicians in many countries.
    Damaged lithium batteries
    Swollen, dropped, wet or opened packs are a fire risk. Do not buy, charge, ship or rebuild them.
    Vehicle safety systems
    Brakes, steering, airbags, seat belts, ABS, frames, forks, couplings. Work by a competent person only, verified by a proper function test.

    What to decide

    Every assessment ends in one of five decisions. All five are good outcomes if they are the right one.

    Buy the working one
    A verified working example at a price that leaves room for your costs. Often the better flip than any repair.
    Inspect further
    The cause is still open but the seller lets you check. Go, test, and decide there.
    Get a professional quote first
    The fault is beyond you but the item is worth enough. Let a professional quote before you pay, and enter the quote as a cash cost.
    Buy only at a defensible salvage value
    The cause stays unknown. Buy only at a price that works if it is never repaired — a salvage value you could defend.
    Walk away
    Identity, safety, locks, missing evidence, or numbers that do not survive the adverse case. No purchase, no loss.

    Frequently asked

    Neither. It means nobody has checked, or the seller prefers not to say. Price it as unknown: the adverse case in your calculation should assume it does not work and cannot be fixed.

    That the seller expects the buyer to do work or take it apart. It does not say what is wrong, whether parts exist, or whether it can be made safe. For vehicles it can also mean “no longer fit for the road”. Ask which.

    No. A seller’s guess makes one cause plausible; it rules nothing out. Ask what they observed, what they tried and whether you may test. If they are right, a test will show it.

    Because we do not have them, and an invented percentage would be worse than none. The calculator lets you enter your own assumptions and shows what happens if the repair fails.

    Yes — describe what was wrong, what you replaced and what you did not check. Apart from being fair, in many countries an inaccurate description is what creates liability for the seller.

    About this guide

    Written by the FlipGap editorial team with AI drafting. AI-assisted draft, checked against the cited sources.

    No mechanic, technician or lawyer has reviewed this page. Nothing here is based on a personal test or a documented flip.

    Updated:
    Human review:
    not yet
    Market:
    United Kingdom
    Language:
    English