Korean Tenant Fire Liability and Renter Rider Coverage Gap Calculator
Split a Korean tenant’s fire liability into the rented part, the rest of the landlord’s building and neighbours under the 2017 Supreme Court en banc rule, then compare renter liability rider limits, the daily-liability managed-property exclusion and landlord insurer subrogation.
A tenant’s fire liability splits into the rented part, the rest of the landlord’s building and neighbours, each with a different burden of proof and policy.
Initial inputs are fictional. This compares scenarios rather than predicting damages; cause and fault are settled by the fire investigation and courts, payouts by your policy. Korean 2026 rules, checked October 31, 2026.
Review inputs and calculate. Editing hides the previous result and export.
Official basis: Civil Act Arts. 374, 390, 393, 615, 623, 654, 750, 765 / Fire Liability Act Arts. 2–3 / Commercial Act Arts. 682, 719, 724 / Supreme Court en banc 2012Da86895, 86901 / standard liability terms Art. 4(4) · 2026-10-31
A tenant’s fire liability depends on which part burned and who must prove fault
This calculator estimates how much a tenant in a Korean jeonse or monthly-rent home may owe after a fire, and how much of that the tenant’s current insurance leaves uncovered.
Under Korean law the rented unit, the rest of the same landlord’s building and neighbours’ property each rest on a different legal basis and burden of proof.
That is why “I have fire insurance” alone can hide a gap of tens of millions of won.
Unknown-cause fires are the hardest case for tenants.
The Korean Supreme Court holds that a tenant must compensate damage to the rented part unless the tenant proves the loss was not the tenant’s fault.
Most daily-life liability policies exclude property the insured uses or manages, so without a renter (tenant) liability rider the restoration cost of the rented home can stay entirely with the tenant.
This calculator is based on Korean rules: the Civil Act (effective 2026-03-17), the Act on Liability for Fires Caused by Negligence (effective 2009-05-08), the Commercial Act (effective 2026-09-10), Supreme Court en banc judgment 2012Da86895, 86901 of May 18, 2017 and the standard liability policy terms in Annex 15 of the Detailed Regulations on Insurance Supervision (effective 2026-09-10), all checked through the Korean National Law Information OPEN API.
Results compare scenarios rather than predict damages; fire cause and fault are settled by the fire investigation and courts, and payouts by your policy wording.
Who this is for
- Tenants choosing a renter liability rider limit of KRW 10M, 30M, 50M or 100M before signing or renewing a jeonse lease
- Households with daily-life liability cover who cannot tell whether an extra rider is needed
- Tenants who received a restoration or subrogation demand from the landlord or the landlord’s insurer after a fire
- Single-person households renting one unit of a multi-unit house who worry about neighbours
- Adult children reviewing the insurance of parents who rent their home
1. Three parts of a tenant’s fire liability
The calculator splits fire damage into the three parts below.
Each part has its own legal basis, its own allocation of the burden of proof and its own matching insurance.
| Part | Legal basis | Burden of proof | Matching cover |
|---|---|---|---|
| Rented part (your unit) | Breach of the duty to preserve and return (Civil Act §374, §390, §615, §654) | Tenant must prove no fault to escape liability | Renter liability rider |
| Rest of the building (other units, common areas of the same landlord) | Breach of contract (Civil Act §390, §393) | Landlord must prove the tenant’s breach and causation | Daily liability, fire property liability rider |
| Neighbours and third parties | Tort (Civil Act §750) with Fire Liability Act reduction | Victim must prove the tenant’s fault | Daily liability, fire property liability rider |
The key point is that the tenant carries the burden of proof only for the rented part.
In an unknown-cause fire the rented part stays with the tenant, while the rest of the building and neighbours create no liability unless the other side proves fault.
That makes the renter liability rider the most important cover in the unknown-cause scenario.
2. The 2017 Supreme Court en banc standard
Supreme Court en banc judgment 2012Da86895, 86901 of May 18, 2017 is the leading Korean authority on fires in leased buildings.
Each holding of the original text (precedent serial 184812) maps to a calculation step.
[1] Rented part
If the leased property is destroyed or damaged by fire, the tenant compensates the loss unless the tenant proves the impossibility of return was not caused by the tenant.
The same applies when the specific cause of the fire is never identified.
[2] Rest of the building
The landlord must allege and prove the tenant’s breach of the duty of care, adequate causation and that the loss falls within Civil Act Article 393.
Earlier rulings that made tenants liable for structurally inseparable parts were overruled.
[3] Victim’s direct claim
The victim’s direct claim under Commercial Act Article 724(2) is a damages claim, but the insurer’s obligation is capped by the policy limit.
In other words, the rider limit is the most insurance can solve.
The rule was reaffirmed in Supreme Court judgments 2015Da219030 (October 25, 2018) and 2023Da244895 (November 2, 2023).
Judgment 2023Da244895 held that guest rooms stay under the lodging operator’s control, so unknown-cause fire damage to a room generally falls on the operator, drawing a line between lodging and ordinary home leases.
This calculator models a single residential lease.
3. Unknown causes and the landlord-defect exception
A tenant must preserve the property with the care of a good manager while using it (Civil Act Article 374) and return it in its original condition when the lease ends (Article 615 applied by Article 654).
If fire makes return impossible, that is a breach of contract, and the tenant must prove the absence of intent or negligence (Article 390 proviso).
Zero liability for a landlord-domain defect
The landlord must keep the property fit for use during the lease (Civil Act Article 623).
If the fire is inferred to come from a defect in the landlord’s domain, such as in-wall wiring or aged equipment the landlord installed, the landlord generally cannot claim against the tenant.
The exception to the exception
If the tenant knew or could have known of the defect, liability can remain even for a landlord defect.
The calculator’s “tenant knew the defect” box revives rented-part liability in that case.
If a breaker kept tripping and you never told the landlord, that can count against you, so report warning signs in writing such as a text message.
4. Neighbours and the Fire Liability Act reduction
Damage that spreads to a neighbouring unit is judged as a tort under Civil Act Article 750 because there is no contract with the neighbour.
The victim must prove the tenant’s intent or negligence, so with an unknown cause the calculator sets neighbour liability to zero.
Once fault is proven the full amount is the starting point, but the Fire Liability Act allows a reduction.
Act on Liability for Fires Caused by Negligence, Articles 2 and 3
The Act applies only to damages claims for the part caused by the spread of a negligent fire (Article 2).
Unless the fire resulted from gross negligence, the liable person may ask the court for a reduction (Article 3(1)), and the court may reduce damages considering the factors below (Article 3(2)).
- The cause and scale of the fire
- The object and extent of the damage
- The causes of the spread and of any aggravation
- The negligent person’s efforts to prevent the damage from growing
- The financial circumstances of the liable person and the victim
- Other circumstances relevant to setting damages
There is no fixed formula for the reduction because it is left to the court.
The calculator therefore defaults the reduction to 0% and lets you change it only as a scenario.
Ticking gross negligence fixes the reduction at 0%, mirroring the general tort reduction in Civil Act Article 765, which is also unavailable for intent or gross negligence.
5. Renter rider vs daily liability vs fire property liability
A tenant can rely on three kinds of liability cover.
Their names sound alike, but they pay for different things and cannot replace one another.
| Cover | Main target | Rented part | In the calculator |
|---|---|---|---|
| Renter liability rider (fire policy) | Liability for fire damage to the rented building | Paid within limit and deductible | Rented part C1 |
| Daily-life liability | Injury or property damage to others from using the home | Usually excluded as managed property | Third parties C3; rented remainder C2 if covered |
| Fire property liability rider | Fire damage to neighbours and other people’s property | Not paid | Third parties C3 |
Insurers in Korea commonly quote renter rider limits of KRW 10M, 30M, 50M and 100M.
Limits vary by product and insurer, so the calculator compares those four tiers with your current limit.
If your policy is specially designed to cover the whole building, including the parts you do not rent, the payout can exceed the result, so the wording prevails.
6. The managed-property exclusion in daily liability
Article 4(4) of the standard liability policy terms in Annex 15 of the Detailed Regulations on Insurance Supervision excludes “liability for damage to property owned, used or managed by the insured, owed to the person with a legitimate right to that property.”
A rented home is exactly property the tenant uses and manages, so if that wording applies, daily liability does not pay the landlord for the rented part.
Choosing “Not sure” shows both results side by side
Daily-liability wording and any rented-home extension differ by product.
Until you check the wording, the calculator keeps “Not sure” as the default and calculates both the excluded and the covered case.
The headline uses the conservative excluded result, and a large difference between the two means checking the wording is your first task.
Many daily-liability products carry a property deductible of about KRW 200,000 per accident, but the amount on your policy prevails.
The calculator treats the limit and deductible as applying once per accident, using them on neighbours first and applying only what is left to the rented part.
7. How the calculation works
The calculator derives exposure and the coverage gap in the order below.
All amounts are whole won; only the reduction scenario rounds to the nearest won.
- Rented part L1 = rented-part damage (zero for a landlord defect the tenant did not know about)
- Other building L2 = other-building damage × [tenant fault proven]
- Neighbours L3 = neighbour damage × (100 − reduction)% × [tenant fault proven], reduction 0 for gross negligence
- Renter rider C1 = min(max(L1 − rider deductible, 0), rider limit)
- Third parties C3 = min(max(L2 + L3 − property deductible, 0), daily limit + fire rider limit)
- Daily on rented part C2 = if covered, min(L1 − C1 − unused deductible, remaining daily limit)
- Coverage gap = (L1 + L2 + L3) − (C1 + C2 + C3)
Limit tiers and the ★ tier
The calculator recomputes C1 with no rider and with KRW 10M, 30M, 50M and 100M limits.
Assuming daily liability excludes the rented home, ★ marks the lowest tier where the rented-part gap falls to the rider deductible.
The minimum limit needed is L1 minus the rider deductible, shown separately when even KRW 100M is not enough.
8. Example A — unknown cause, KRW 10M rider
Assume an unknown-cause fire in one unit of a multi-unit house damages the rented part by KRW 42,000,000, other parts of the same landlord’s building by KRW 18,000,000 and neighbours’ property by KRW 25,000,000.
The tenant has a KRW 10M renter rider (no deductible) and KRW 100M daily liability with a KRW 200,000 property deductible, and does not know whether daily liability covers the rented home.
Because the cause is unknown, exposure is only the rented part at KRW 42,000,000, with zero for the other building and neighbours.
The rider pays KRW 10,000,000, so if daily liability excludes the rented home the gap is KRW 32,000,000.
If daily liability covers it, the remaining KRW 32,000,000 less the KRW 200,000 deductible, or KRW 31,800,000, is also paid and the gap falls to KRW 200,000.
| Rider limit | Rider payout | Total gap (daily excluded) | Total gap (daily covers) |
|---|---|---|---|
| No rider | KRW 0 | KRW 42,000,000 | KRW 200,000 |
| KRW 10M (current) | KRW 10,000,000 | KRW 32,000,000 | KRW 200,000 |
| KRW 30M | KRW 30,000,000 | KRW 12,000,000 | KRW 200,000 |
| ★ KRW 50M | KRW 42,000,000 | KRW 0 | KRW 0 |
| KRW 100M | KRW 42,000,000 | KRW 0 | KRW 0 |
The minimum limit needed is KRW 42,000,000, so the ★ tier is KRW 50M.
If the daily-liability wording excludes the rented home, even the KRW 30M tier leaves KRW 12,000,000 uncovered unless the rider is raised to at least KRW 50M.
9. Same damage, different causes
Changing only the fire cause for the damage and cover of Example A changes the outcome sharply.
The table shows how much the fire investigation matters to a tenant.
| Fire cause | Exposure | Expected payout | Coverage gap |
|---|---|---|---|
| Cause unknown | KRW 42,000,000 | KRW 10,000,000 | KRW 32,000,000 |
| Tenant fault proven | KRW 85,000,000 | KRW 52,800,000 | KRW 32,200,000 |
| Defect in the landlord’s domain | KRW 0 | KRW 0 | KRW 0 |
If tenant fault is proven, the other building’s KRW 18,000,000 and the neighbours’ KRW 25,000,000 are added, raising exposure to KRW 85,000,000.
The KRW 43,000,000 of third-party property is paid within the KRW 100M daily limit less the KRW 200,000 deductible, or KRW 42,800,000, so the gap is the rented part’s KRW 32,000,000 plus the deductible, KRW 32,200,000.
If a landlord defect is found, the tenant owes nothing.
Example B — tenant fault, large neighbour damage in an apartment
If a heater mishap damages the rented part by KRW 35,000,000 and neighbouring units by KRW 80,000,000, with a KRW 30M rider and KRW 100M daily liability that excludes the rented home, the KRW 115,000,000 exposure is met by KRW 30,000,000 from the rider and KRW 79,800,000 for third parties, leaving a KRW 5,200,000 gap.
The ★ tier here is KRW 50M, and the KRW 200,000 left afterwards is the property deductible that no rider can close.
In a scenario where the court reduces neighbour damages by 30%, neighbour exposure falls to KRW 56,000,000.
10. Responding to the landlord insurer’s subrogation claim
If the landlord insured the building, the insurer pays the landlord first, then takes over the landlord’s rights up to what it paid and claims against the tenant (Commercial Act Article 682(1)).
That is a subrogation claim, and the insurer cannot recover more than the landlord could have claimed from the tenant.
Insured first (Article 682(1) proviso)
If the insurer paid only part of the loss, it may exercise the rights only without infringing the landlord’s own rights.
In Example A, if the landlord’s KRW 60,000,000 building loss received KRW 50,000,000 of insurance, the uncompensated KRW 10,000,000 is claimed by the landlord first and the insurer’s subrogation is the remaining KRW 32,000,000.
Payments that cannot be recovered
In the same example, KRW 18,000,000 of the KRW 50,000,000 payment relates to parts such as the other building for which the tenant is not liable in an unknown-cause fire, so it cannot be recovered.
If the tenant shares a livelihood with the landlord, the insurer acquires no subrogation right unless the damage was intentional (Article 682(2)).
When you receive a subrogation demand, ask for the amount and evidence split into rented part, other building and neighbours.
A demand that includes the rest of the building for an unknown-cause fire may not match the 2017 en banc standard.
Reporting the claim to your own renter or daily-liability insurer right away often lets the insurers settle between themselves.
11. Special buildings such as apartments of 16 or more floors
The Act on Compensation for Fire Damage and Insurance Coverage requires owners of special buildings, including apartments of 16 or more floors (and 15-floor-or-lower blocks in the same complex), to buy fire insurance with a liability rider (Act Article 5, Enforcement Decree Article 2(1)12).
The owner of a special building is liable without fault, within the insured amount, when a fire injures others or damages their property, and property damage is covered up to KRW 1 billion per accident (Act Article 4(1), Decree Article 5(1)4).
So when a tenant’s fire damages neighbouring units in a large apartment complex, victims can first be paid from the owner-side mandatory policy.
That insurer may then pursue a negligent tenant under Commercial Act Article 682, so the tenant still needs daily-liability and fire property liability limits.
This calculator does not compute the special-building owner’s no-fault liability; it covers only the tenant’s own exposure.
12. How to use the calculator
Step 1: Choose the fire-cause scenario
For a pre-loss check, start with “Cause unknown,” the most common and least favourable case.
After a fire, match the fire certificate and investigation findings by choosing unknown cause, tenant fault or landlord defect.
Step 2: Enter the three damage amounts
Enter the rented-part restoration cost, damage to the rest of the same landlord’s building and neighbours’ property separately.
Before signing, use an expected repair cost or the size of the deposit as the rented-part damage to gauge the worst case.
Step 3: Copy your policy covers
Enter the renter rider limit and deductible, the daily-liability limit and property deductible, and the fire property liability rider limit from your policy.
If you do not know whether daily liability covers the rented home, leave it at “Not sure.”
Step 4: Landlord insurance and subrogation
If you know what the landlord’s insurer paid or will pay, enter it to see subrogation exposure and the unrecoverable part.
Otherwise leave it at zero.
Step 5: Save the result and act
Review the gap, the ★ tier and the cause comparison, then save the TXT worksheet for your insurer or adjuster.
Changing any input hides the previous result and the save button automatically.
13. Use cases
Before a jeonse contract or renewal
If the insurer asks you to choose a rider limit, check the ★ tier in the unknown-cause scenario.
The larger the deposit and the home, the larger the restoration cost, and the KRW 10M tier quickly falls short.
Households with daily liability only
If the two gaps in the “Not sure” result differ a lot, check the managed-property exclusion first.
If it applies, adding a renter rider closes the largest gap.
After receiving a subrogation demand
Enter the demand split into rented part, other building and neighbours, and use the cause table to judge whether contesting the cause is worth it.
If a landlord defect is plausible, paying for an expert assessment can make sense.
Single households in multi-unit houses
If one landlord owns the whole building, other-building damage can be large.
Check in the tenant-fault scenario whether daily and fire property liability limits are enough.
14. Frequently asked questions
Do I have to pay even if the cause is unknown?
For the rented part, yes.
Supreme Court en banc 2012Da86895 held that a tenant who cannot prove the loss was not the tenant’s fault must compensate the rented part even if the cause is never identified.
A defect in the landlord’s domain is the main exception.
Do I have to pay for the next unit or common areas?
For other parts of the same landlord’s building, liability arises only if the landlord proves your breach and causation.
With an unknown cause the calculator sets this part to zero.
Since 2017, being structurally inseparable is no longer enough.
Why does my daily liability pay nothing for the rented part?
If the wording excludes property the insured owns, uses or manages, as Article 4(4) of the standard liability terms does, liability for the rented home is not paid.
Products differ, so compare both results with “Not sure” and then check your wording.
What renter rider limit is enough?
You need at least the estimated restoration cost of the rented part minus the rider deductible.
The calculator marks with ★ the lowest of the KRW 10M, 30M, 50M and 100M tiers that removes the rented-part gap.
Does the Fire Liability Act reduce neighbour damages?
Unless the negligence was gross, you can ask the court for a reduction, but the rate is up to the court.
The calculator defaults to 0% and treats any rate only as a scenario, with no reduction for gross negligence.
How much can the landlord’s insurer recover from me?
Only up to what it paid and within what you owe the landlord.
If the landlord still has uncompensated loss, the landlord’s own claim comes first (Commercial Act Article 682(1) proviso).
Should I include my own belongings?
No.
Your belongings are a first-party contents claim under your own fire policy, not liability.
This calculator covers only what you owe others.
Can commercial tenants use it?
The property-liability structure is similar, but business interruption and mandatory multi-use-business insurance are not modelled.
Commercial tenants should also use the commercial property fire insurance calculator.
15. Tips and cautions
- Record right after the fire: obtain the fire certificate (Fire Investigation Act Article 16), the investigation findings and photos
- Report warning signs: tell the landlord about electrical or wiring problems in writing, such as by text message
- Split any demand: ask for amounts separated into rented part, other building and neighbours
- Deposit settlement: restoration damages are often deducted from the deposit refund, so check the basis before agreeing
- Overlapping policies: several daily-liability policies never pay more than the actual loss and are shared pro rata
- Review the limit: re-estimate the restoration cost at every move, deposit increase or renewal
This calculator does not cover bodily injury or death, criminal liability, business losses or premiums.
Fault ratios and damage amounts depend on adjusters and courts, so consult a loss adjuster or lawyer in an actual dispute.
16. Official sources and reference date
Statutes and precedents were checked as current through the Korean National Law Information OPEN API on 2026-10-31.
The basis is the Civil Act MST 284415, the Act on Liability for Fires Caused by Negligence MST 93181, the Commercial Act MST 273629, the Act on Compensation for Fire Damage and Insurance Coverage MST 248933 and its Decree MST 254165, the Fire Investigation Act MST 268791, the Detailed Regulations on Insurance Supervision (effective 2026-09-10) and precedent serials 184812, 206342, 237923 and 204347.
- Supreme Court en banc 2012Da86895, 86901: liability for fires in leased buildings
- Civil Act Article 390: damages for non-performance
- Civil Act Article 623: landlord’s obligations
- Civil Act Article 750: torts
- Fire Liability Act Article 3: reduction of damages
- Commercial Act Article 682: subrogation against third parties
- Commercial Act Article 724: insurer and third parties
Statutes and precedents change rarely, but rider limits and policy wording change often by insurer.
Before buying, read the product summary and the “losses not covered” clause of the wording.
17. Check your gap and review your rider
Enter your policy details above to see the unknown-cause gap and the ★ tier, then save the worksheet.
Use it to ask the insurer to add or raise a rider, or as the evidence base when answering a subrogation demand after a fire.
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- Apartment Water Leak Damages Calculator — responsibility and daily-liability handling for leaks
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