Flatmate Leases in Nigeria: Who Signs, and What If One Stops Paying?

Here's the short answer, because almost nobody publishes one: in most Nigerian flatshares, one person signs the lease and everyone else is legally invisible. That works fine until money stops moving. Then the person who signed discovers they owe the landlord everything, and the flatmates discover they have almost no legal protection at all.

There is surprisingly little written about the legal side of sharing a flat in Nigeria — tenancy law here was drafted with a single landlord and a single tenant in mind, and flatmates mostly exist in the gaps. This guide walks through the three ways a flatshare can be structured legally, what actually happens (and what you can and cannot do) when a flatmate stops paying, and how to set things up so you never need the ugly parts of this article.

One thing before we start: this is general information, not legal advice. Tenancy law varies by state, and much of flatmate law in Nigeria is genuinely unsettled. If real money is at stake, talk to a lawyer.

The three ways a flatshare can be structured

Every shared flat in Nigeria sits in one of three legal arrangements — whether or not anyone in it has thought about which.

Structure 1: Everyone signs the lease (joint tenants)

All flatmates are named on the tenancy agreement and all of them sign. Legally, you are co-tenants, and in almost every Nigerian lease with multiple tenants, liability is joint and several.

Joint and several liability is the phrase to memorise, because it does not mean what most people assume. It does not mean "I'm responsible for my ₦600k share of the ₦1.8m rent." It means the landlord can pursue any one of you for the entire ₦1.8m. If your two flatmates vanish to Canada, the landlord doesn't have to chase them — he can sue you alone for the full amount, and the fact that you paid "your share" is not a defence against him. Recovering the missing shares from your ex-flatmates is then your problem, not his.

What you get in exchange for that risk:

Equal legal status. Every signer is a tenant under the tenancy law of the state. In Lagos, that means the protections of the Lagos Tenancy Law 2011 — proper notice periods, no unlawful eviction, receipts for rent — apply to each of you directly. (We break those protections down in our Lagos tenant rights guide.)
Nobody can throw anybody out. No flatmate is another flatmate's landlord. Only the actual landlord, through proper legal process, can evict a joint tenant.
Direct relationship with the landlord. You're not dependent on one "main" person for receipts, renewal negotiations, or your caution fee refund.

The downsides: many landlords simply refuse to put three names on an agreement (more names feel like more wahala), and joint tenancy makes leaving mid-term messy — one person can't just "come off" the lease without the landlord issuing a fresh agreement.

Structure 2: One principal tenant + informal flatmates (the Nigerian default)

This is how the overwhelming majority of Nigerian flatshares actually work. One person — call her Ada — signs the lease, pays the landlord, and then finds flatmates who pay Ada. The landlord may know about the flatmates, half-know, or not know at all.

Be honest about what this is legally:

Ada carries 100% of the risk. She owes the full rent whether or not her flatmates pay her. If a flatmate defaults, the landlord's quit notice comes to Ada.
The flatmates have almost no legal protection. They are not tenants under the tenancy law. They are, at best, licensees — people occupying with the principal tenant's permission. A licensee's rights come from their arrangement with Ada, not from statute. If that arrangement is verbal (it usually is), a flatmate's security is essentially Ada's goodwill plus whatever WhatsApp messages exist.
It may quietly breach the lease. Most Nigerian tenancy agreements contain a clause prohibiting subletting or parting with possession of any part of the premises without the landlord's written consent. Taking in a paying flatmate arguably triggers that clause. Breach of it is a classic ground for the landlord to terminate the tenancy. In practice many landlords don't care as long as rent arrives and the flat stays peaceful — but "the landlord probably won't care" is a risk assessment, not a legal position.

We'd love to tell you exactly where the line sits between "my friend stays with me" (generally fine) and "I have sublet a room" (consent needed). The honest answer is that Nigerian courts haven't drawn that line clearly for the modern flatshare, and anyone who tells you it's settled is guessing. Money changing hands and exclusive possession of a specific room push it towards subletting; a guest on your couch does not.

Structure 3: Formal subletting with landlord consent (rare, but real)

Under the Lagos Tenancy Law 2011, a sub-tenant is someone occupying part of premises sublet to them with the written consent of the landlord — and a sub-tenant with that consent is recognised as a tenant in their own right, with the law's protections. Someone brought in without consent doesn't get that status; the law treats them as being in unlawful possession rather than as a sub-tenant.

So the formal route exists: principal tenant asks the landlord in writing, landlord consents in writing, flatmate becomes a lawful sub-tenant. It's rare because nobody asks. More on how to ask below — it's an easier conversation than people fear.

Which structure should you pick?

Strangers or new acquaintances pooling for a flat → push for everyone signs (Structure 1). You have no history to trust; get equal legal standing instead. If you met through a platform like Mushrooms' flatmate matching, you've verified identity — now verify liability too.
You already hold a lease and want to fill a room → Structure 2 is realistic, but do it properly: get written landlord consent if your lease has a no-subletting clause (most do), and put a written flatmate agreement between you and the flatmate. Our flatmate agreement guide has a template built for exactly this.
Long lease, significant rent, flatmate staying a year+ → it's worth pursuing Structure 3 so your flatmate has real status and you have real cover.
Couples and close family → Structure 2 without ceremony is usually fine; the risks in this article are mostly about money between people whose relationship might not survive a dispute.

One more filter: whatever the paperwork, choose the people carefully — here's how to actually vet a flatmate. No contract fixes a bad match; it only makes the ending less expensive.

The money-failure playbook: your flatmate stops paying

This is the scenario the whole article exists for. You're the principal tenant, rent renewal (or the monthly split) is due, and a flatmate has gone quiet. Here's the playbook, in order.

First, know what you CANNOT do

You are not the landlord. Even the actual landlord cannot lock a tenant out or throw belongings on the street — self-help eviction is unlawful in Lagos and most states, and can expose you to criminal liability and damages. As a principal tenant dealing with an occupier, you have less formal power, not more. So:

No changing locks while their property is inside.
No seizing property ("I'm holding your TV until you pay") — that can amount to unlawful conversion, and possibly theft.
No removing doors, cutting power to their room, or hiring area boys. Beyond being illegal, it converts a debt dispute where you're the wronged party into a situation where you're the one facing police attention.

What you CAN do

Document everything, immediately. Screenshot transfer histories, chats where the payment arrangement was agreed, the flatmate agreement if one exists. Establish, in writing, what was owed and when.
Send a written demand. A message or letter: amount owed, what it covers, a specific deadline (7–14 days is reasonable), and what happens if it passes ("I will ask you to vacate and pursue the debt"). Calm, factual, dated. This is both fair warning and Exhibit A.
Protect the head lease first. If the shortfall means the landlord won't be paid, cover it if you possibly can and pursue the flatmate for the debt. Losing the flat over a flatmate's default is the worst outcome; a debt you can chase is recoverable, a terminated tenancy usually isn't.
Ask them to leave — with written notice. Here's the legally grey part, stated honestly: an informal flatmate is likely a licensee, and a licence can be revoked on reasonable notice. What "reasonable" means for a rent-paying occupier isn't cleanly defined in Nigerian law. Practical guidance: give written notice of at least the period their payments ran on (paid monthly → a month's notice), in writing, with a clear vacate date. If they had any written agreement with a notice clause, follow it. Generous notice costs you little and makes your position far stronger if things escalate.
If they refuse to leave, do not escalate physically — escalate legally. A lawyer's letter often ends it. Beyond that, court is the road: slower and costlier than anyone wants, which is precisely why prevention (below) matters more than remedy. If the situation involves harassment or damage rather than just debt, our guide to handling a bad flatmate in Lagos covers those tracks.
For the debt itself: small claims. Lagos runs a Small Claims Court for debts up to ₦10 million, designed to be fast (target timelines around 60 days) and usable without a lawyer. If your documentation from step 1 is clean — agreed amount, written demand, no payment — this is exactly what it's for. Other states are rolling out similar tracks; check your state's magistrate court.

Prevention beats every step above

Every item in that playbook is worse than not needing it:

Written flatmate agreement, always. Amounts, dates, exit notice, what happens on default. Template and walkthrough here. Ten minutes of mild awkwardness now versus months of dispute later.
An exit-notice clause — e.g. "either party gives one month's written notice" — converts the murkiest legal question in this article into a simple contract term you both agreed to.
Collect rent before it's due, not after. If the landlord's rent is due yearly, collect flatmate shares into a dedicated pot monthly, so a default shows up months early — as a small gap you can react to, not a crater on renewal day. Tools like Mushrooms split-rent exist to make the shares visible and the record automatic; even a dedicated bank account beats "transfer me when you can." More on systems that work in our rent and bills splitting guide.
Hold a one-month buffer. As principal tenant, price in one month of one flatmate's share as your risk cushion. If you can't absorb that, you can't really afford to be the principal tenant of that flat.

Flatmate wants to leave mid-lease

The mirror-image problem. What they owe depends on structure:

Joint tenant: legally on the hook until the lease ends or the landlord releases them — leaving doesn't erase joint and several liability. In practice, the clean exit is a replacement the landlord accepts, ideally papered with a fresh or amended agreement.
Informal flatmate: owes whatever the flatmate agreement says; with no agreement, whatever was verbally understood — which is why departures without paper turn into shouting matches about what was "understood."

The fair convention either way: the leaver gives agreed notice and helps find an acceptable replacement; they remain liable for their share until the replacement starts paying or the notice period ends, whichever is first. We've written a full protocol — timelines, deposit handover, introducing the replacement to the landlord — in how to replace a flatmate mid-lease.

Deposits between flatmates: who holds the caution fee?

Nigerian landlords typically collect a caution fee/security deposit from the tenant — meaning, in Structure 2, from the principal tenant. When flatmates each contribute a share, record three things in writing: how much each person put in, that it's refundable on the same conditions as the landlord's refund, and that deductions for damage follow the landlord's actual deductions (with the person responsible for specific damage bearing that deduction). Otherwise the caution refund — already a fight with landlords, as our caution fee refund guide shows — becomes a second fight inside the flat. A leaving flatmate's deposit share should normally be refunded by the incoming replacement, not by the principal tenant fronting cash.

Asking the landlord for consent: a script that works

Landlords say no to surprises, not usually to flatmates. Frame it as risk reduction for them:

> "Good afternoon sir/ma. I'd like your written consent to share the flat with one other person, [name], a [job] at [company]. Rent remains fully my responsibility and will continue to come from me as one payment. [Name] has been identity-verified and I have references I can share. I'm asking formally because I want everything on this tenancy to stay proper. Could we add a simple consent note to the agreement?"

Why this lands: rent responsibility doesn't change, the landlord still deals with one person, and you've signalled you're the careful type of tenant. If they want extra rent for the additional occupant, that's a negotiation — factor it against the value of being fully covered. Get the consent in writing, even two lines on paper or a clear text message. If instead the response is a threat or a sudden rent demand, know your ground first: quit notices and rent increase rights.

FAQ

Does every flatmate need to sign the tenancy agreement in Nigeria? No — and usually only one person does. But only signers are tenants with statutory protection. Non-signing flatmates are informal occupiers whose rights come from their (ideally written) arrangement with the principal tenant. If you're a non-signer, insist on a written flatmate agreement at minimum.

My flatmate stopped paying rent — can I lock them out? No. Self-help eviction is unlawful even for landlords, and you're not the landlord. Written demand, written notice to vacate with a reasonable period, then legal routes (lawyer's letter, small claims for the debt). Lock-outs and property seizure can turn you from creditor into defendant.

Can I legally sublet a room in my flat in Nigeria? Only with the landlord's written consent — most tenancy agreements prohibit subletting without it, and in Lagos the 2011 Tenancy Law only recognises sub-tenants brought in with written landlord consent. Subletting without consent is a breach that can cost you the whole tenancy.

If we all sign the lease, am I only liable for my share? Almost certainly not. Multi-tenant leases in Nigeria are normally jointly and severally liable: the landlord can recover the entire rent from any one signer. Your protection against carrying others' shares is a flatmate agreement between yourselves plus a payment system that surfaces defaults early — not the lease.

My flatmate wants to leave six months into a one-year rent — what do they owe? By default, whatever your agreement says. The fair norm: notice plus liability for their share until a replacement takes over or the notice period ends. A joint tenant remains liable to the landlord until formally released, regardless of moving out.

Is being an informal flatmate risky for me, or only for the principal tenant? Both, differently. The principal carries the full financial liability; the informal flatmate carries the security risk — no statutory tenancy protection, and occupancy that ultimately depends on the principal's tenancy surviving. If the principal defaults or breaches the lease, the flatmate's home goes down with it, consent or none. A written agreement and proof of every payment are the flatmate's best (and honestly, only) armour.

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Nigerian tenancy law hasn't caught up with how people actually live, and most flatshares run on trust filling a legal vacuum. Trust is a fine foundation and a terrible contingency plan. Pick your structure deliberately, put the money terms in writing, and make payments visible before they're late — find verified flatmates and run the split transparently, and the playbook above stays what it should be: something you read once and never needed.

This article is general information, not legal advice. For a live dispute, consult a lawyer licensed in your state.