What Is a Consent to Let Agreement and Do You Need One Before Renting Out Your Home in the UK?

You Want to Rent Out Your Home — But There’s a Step Most People Miss

Life doesn’t always go to plan. Maybe you’ve been offered a job in another city. Perhaps you’re moving in with a partner but aren’t ready to sell. Or maybe you’re struggling with your mortgage payments and renting out your home feels like the only way to keep things afloat financially.

Whatever your reason, the instinct to rent out your property makes complete sense. But before you list it on Rightmove or hand keys to a tenant, there’s something you must do first — and it’s something thousands of UK homeowners overlook every year.

You need to speak to your mortgage lender and, in most cases, get what’s called a consent to let agreement.

What Is a Consent to Let Agreement?

A consent to let agreement (sometimes written as “consent-to-let”) is written permission from your mortgage lender allowing you to rent out a property that was originally purchased with a residential mortgage.

When you took out your mortgage, you agreed to live in the property as your main home. That’s the basis on which the lender priced your interest rate and assessed your risk. The moment you rent it out without telling them, you’re technically in breach of your mortgage contract.

Important: This isn’t a technicality buried in the small print. Lenders take it seriously — and the consequences of ignoring it can be significant.

Why Does It Matter So Much?

Renting out a property changes the risk profile for your lender. Tenants are statistically more likely to cause wear and damage than owner-occupiers. The lender’s security — your home — could be affected. That’s why most residential mortgage products explicitly prohibit letting without permission.

If you rent without consent:

• Your lender could demand immediate repayment of the full mortgage balance
• They may switch you to a higher interest rate without notice
• Your home insurance could be invalidated (most standard policies don’t cover tenant-occupied properties)
• If you’re in arrears and seeking support, it could undermine your case with the lender

For anyone already in financial difficulty, this is the last thing you need.

How Is Consent to Let Different from a Buy-to-Let Mortgage?

This is where people get confused. Here’s a simple breakdown:

Consent to let is essentially a short-term workaround — not a permanent solution. If you plan to rent your property indefinitely, your lender may eventually ask you to remortgage onto a buy-to-let product.

How Do You Apply for Consent to Let?

The process is usually straightforward:

1. Contact your mortgage lender directly — by phone, online, or in writing
2. Explain your circumstances — why you’re renting out and for how long
3. Provide any supporting information they request (e.g. proof of your new address if relocating)
4. Wait for written confirmation — always get it in writing before any tenant moves in

Most high-street lenders, including Nationwide, Halifax, Barclays, and NatWest, have a consent to let process in place. Many will grant it without charging a fee, though some may adjust your interest rate slightly or apply an admin charge of around £50–£150.

Tip from MoneyHelper: Always keep a copy of your consent to let agreement somewhere safe. If a dispute arises with your lender or insurer later, you’ll need it as proof.

Will Your Lender Always Say Yes?

Not necessarily. Your lender can decline, particularly if:

• You’re already in mortgage arrears
• Your loan-to-value (LTV) ratio is very high
• You have a fixed-rate deal with restrictive terms

If you’re in financial difficulty and hoping to rent out a room or the whole property to ease the burden, it’s worth being honest with your lender about your situation. Many lenders have hardship teams specifically trained to find solutions — and renting with consent may actually be one they support.

What About Renting Out Just a Room?

If you’re staying in the property and renting out a spare room, the rules are slightly different. You may be able to take advantage of the Rent a Room Scheme, which allows you to earn up to £7,500 per year tax-free from a lodger in your main home.

In this case, you’re still living there as your primary residence, so you may not need formal consent to let — but it’s still best practice to notify your lender and check your mortgage terms.

Don’t Forget These Practical Steps Too

Once you have consent, there’s more to sort before your first tenant arrives:

• Update your home insurance to a landlord policy — standard buildings and contents insurance won’t cover a tenanted property
• Register the tenancy deposit with a government-approved scheme (such as the DPS or MyDeposits) within 30 days
• Check your council tax obligations — responsibilities may shift depending on tenancy type
• Speak to a solicitor or letting agent about your legal obligations as a landlord, including gas safety certificates and EPCs

The Bottom Line

If you’re thinking about renting out your home — even temporarily, even just a room, even in a genuine emergency — please speak to your mortgage lender first. It costs very little to ask, and it could save you from a very costly mistake.

If you’re feeling overwhelmed or unsure where to start, MoneyHelper (moneyhelper.org.uk) offers free, impartial guidance on mortgages and landlord responsibilities. You can also speak to a fee-free mortgage broker who can advise whether a formal remortgage onto a buy-to-let product makes more sense for your longer-term plans.

You’ve worked hard to own your home. A simple phone call protects everything you’ve built.

This article is for informational purposes only and does not constitute regulated financial or legal advice. Always seek independent advice tailored to your personal circumstances before making decisions about your mortgage or property.