Consent to Let: Renting Out Your Mortgaged Home

Sometimes life doesn't go to plan. You need to move — maybe for work, maybe because a relationship has ended, maybe because you've inherited another property — but selling your home doesn't make sense right now. So you think: why not rent it out?

What Is Consent to Let?

Consent to let is exactly what it sounds like — your mortgage lender giving you permission to let (rent out) your property even though you have a standard residential mortgage on it.

When you took out your mortgage, you almost certainly agreed to a condition that said you'd live in the property as your main residence. That's a fundamental term of most residential mortgages. Renting the property out without permission breaks that agreement.

Consent to let is the mechanism that allows you to temporarily change that arrangement without switching your entire mortgage to a buy-to-let product.

When Do You Need It?

Common situations where consent to let applies:

• Job relocation — you've been moved to a different city or abroad, but you don't want to sell
• Relationship breakdown — neither party can afford the mortgage alone, and selling isn't the right move yet (see mortgage after divorce)
• Trying to sell but it's taking time — you've already moved out and want rental income while the property is on the market
• Temporary move — you're living with a partner on a trial basis, caring for a relative, or doing an extended secondment
• Inherited another property — you've moved into an inherited home but want to keep your original
• Negative equity — you can't sell without a loss, so renting is more practical while you wait for values to recover

The common thread is that your situation is temporary or transitional. You're not setting up as a professional landlord — you've been overtaken by circumstances.

How to Get Consent to Let

Step 1: Contact Your Lender

Call or write to your mortgage lender and explain your situation honestly. They'll want to know:

• Why you need to let the property
• How long you expect to be away
• Whether you plan to return to the property
• Who will be living there (tenant type)
• How much rent you expect to charge

Step 2: The Lender's Decision

Most lenders will consider your request reasonably, but they're not obliged to say yes. Factors that help:

• You've been a reliable borrower with a clean payment history
• Your reasons are genuine and understandable
• The arrangement is clearly temporary
• You're in positive equity
• You'll continue making payments regardless of whether you find a tenant

Factors that can lead to refusal:

• You're already in arrears
• You want to let indefinitely with no plans to return
• The property is in negative equity (though some lenders will still agree)
• You've already been renting it out without permission

Step 3: The Terms

If your lender agrees, they'll typically set conditions:

• Time limit — usually 12 months, renewable annually
• Rate increase — often 0.5% to 1% added to your interest rate
• Administration fee — typically £50 to £150
• Insurance requirements — you'll need landlord insurance, not standard home insurance
• Tenancy type — most lenders require Assured Shorthold Tenancy (AST) agreements
• No sub-letting — your tenant can't let to someone else

You'll receive written confirmation of the consent. Keep this safe — you may need it for tax purposes and if any disputes arise.

Consent to Let vs Buy-to-Let Mortgage

These are fundamentally different things, and confusing them can be expensive.

When Should You Switch to BTL?

If you've been renewing consent to let for more than two or three years, most lenders will start pushing you towards a buy-to-let mortgage. Some won't renew consent indefinitely.

You should consider switching to BTL if:

• You've accepted you're not moving back
• You want to be a landlord long-term
• Your consent-to-let rate increase makes a BTL mortgage more competitive
• Your lender is refusing further renewals

What Happens If You Rent Without Permission?

This is where things get serious. Letting your property without your lender's consent is a breach of your mortgage contract. The consequences can be severe:

Mortgage Called In

Your lender can demand immediate repayment of the entire mortgage. In practice, they're more likely to give you a chance to rectify the situation, but they have the legal right to call in the loan.

Insurance Invalidated

Your standard home insurance policy almost certainly doesn't cover a tenanted property. If there's a fire, flood, or other damage while an unauthorised tenant is living there, your insurer can refuse to pay out. This could leave you with a damaged, uninsured property and a full mortgage to repay.

Mortgage Fraud

In serious cases — particularly where someone takes out a residential mortgage with the intention of immediately letting the property to exploit the lower rates — this can constitute mortgage fraud. It's a criminal offence.

The distinction matters: if you genuinely lived in the property and then circumstances changed, lenders are usually understanding. If you never intended to live there and used a residential mortgage to avoid the higher buy-to-let rates, that's a different matter entirely.

Practical Detection

How do lenders find out? Several ways:

• Insurance claims — if a claim reveals the property is tenanted
• Electoral roll — your name isn't registered at the property but someone else's is
• Routine checks — some lenders periodically verify occupancy
• Council tax — records showing the property is let
• Neighbour complaints — yes, this happens more than you'd think

Tax Implications of Renting Out Your Home

When you rent out your property, you become a landlord with tax obligations:

Income Tax

Rental income is taxable. You'll need to:

• Register for Self Assessment with HMRC if you're not already registered
• Declare rental income on your tax return
• Deduct allowable expenses — mortgage interest (at basic rate tax relief only), insurance, letting agent fees, maintenance costs, ground rent and service charges

Mortgage Interest Tax Relief

Since April 2020, landlords can only claim a 20% tax credit on mortgage interest, rather than deducting it from rental income. This affects higher-rate taxpayers more significantly. If you're a 40% taxpayer, you'll pay noticeably more tax on rental income than you might expect.

Capital Gains Tax

If you sell the property after it's been let, you may owe Capital Gains Tax on any increase in value during the letting period. You get Private Residence Relief for the time you lived there, plus the last nine months of ownership regardless of whether you lived there.

Stamp Duty on Future Purchases

If you buy another property while still owning your rented-out home, you'll likely pay the 3% additional property surcharge on stamp duty. This can add thousands to your purchase costs.

Your Responsibilities as a Landlord

Getting consent to let isn't just a mortgage issue — you're taking on landlord responsibilities:

• Gas safety certificate — annual inspection by a Gas Safe registered engineer
• Electrical safety certificate — EICR every five years
• Energy Performance Certificate (EPC) — minimum rating of E (soon to be C for new tenancies)
• Deposit protection — tenant's deposit must be held in a government-approved scheme
• Right to Rent checks — verify your tenant's immigration status
• Smoke and carbon monoxide alarms — on every floor
• Repairs and maintenance — you remain responsible for the structure and services
• How to Rent guide — provide the government's guide to tenants

This isn't a complete list. Landlord regulations are extensive and change frequently. If you're unfamiliar with letting, consider using a letting agent — they typically charge 8% to 15% of rent for full management.

Consent to Let and Leasehold Properties

If your property is leasehold, you'll need to check your lease as well as your mortgage:

• Some leases prohibit subletting — you'll need to check the terms
• Freeholder consent may be required — and there may be a fee
• Notice to freeholder — even if consent isn't required, you usually need to inform them
• Additional restrictions — some leases limit the type of tenancy or require specific tenant vetting

Check your lease carefully. Breaching lease terms can be just as problematic as breaching mortgage terms.

Practical Steps: A Checklist

If you need to rent out your home, here's the order to do things:

1. Read your mortgage terms — understand what your agreement says about letting
2. Contact your lender — request consent to let, explaining your circumstances
3. Check your lease (if leasehold) — look for subletting restrictions
4. Get landlord insurance — switch from standard home insurance
5. Get required safety certificates — gas, electrical, EPC
6. Register for Self Assessment with HMRC
7. Decide: self-manage or use an agent — weigh up the cost vs convenience
8. Find a tenant — reference checks, Right to Rent verification
9. Use a proper tenancy agreement — AST is standard
10. Protect the deposit — within 30 days of receiving it

When Consent to Let Isn't Enough

Sometimes your situation has clearly shifted from temporary to permanent. Signs you need to think bigger:

• You've been away for over two years with no plans to return
• You're buying another property as your main home (consider a let-to-buy arrangement)
• Your lender is refusing further consent renewals
• You want to release equity from the rental property
• You're building a portfolio of rental properties

In these cases, you likely need to remortgage to a buy-to-let product, or sell. A mortgage broker who specialises in buy-to-let can help you understand the options — and whether the numbers still work once you factor in the different rates, tax treatment, and regulatory requirements.

The Bottom Line

Consent to let is a practical solution for people caught between circumstances — not ready to sell, not planning to be a landlord forever, but needing to let their home for a while. It exists because life is messy and lenders recognise that.

The key rule is simple: always ask permission first. The conversation with your lender might feel awkward, but it's infinitely better than the conversation you'll have if they discover you've been letting without consent.

This is educational content, not financial advice. Your situation is unique — speak to a qualified mortgage broker before making any decisions.