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If you own a home with a residential mortgage and want to let it out — even temporarily — you usually need your lender’s permission first. That permission is called consent to let (sometimes “permission to let” or “consent to rent”).
Without it, you may be in breach of your mortgage terms. That matters whether you are letting a single room, the whole house while you work abroad, or planning a later move into HMO investment. This guide explains what consent to let is, when you need it, how applications work, and how it fits with specialist HMO or buy-to-let finance.
What Is Consent to Let?
Consent to let is written approval from your residential mortgage lender to rent out a property that was originally mortgaged as your main home (or as a standard owner-occupier loan).
It is not a new mortgage product. Your loan stays a residential mortgage; the lender adds a condition allowing letting for an agreed period, often with a fee and sometimes a higher interest rate.
Typical situations where landlords ask for consent to let:
- Relocation for work — letting the former home while renting elsewhere
- Unable to sell — renting until the market improves
- Relationship breakdown — one party remains in the property or it is let
- Trial period — testing whether to keep the property as a long-term rental
Consent to let is usually short term (often six to twelve months, sometimes up to two years). It is designed as a bridge, not a permanent buy-to-let strategy.
Do You Really Need Consent to Let?
In almost all cases, yes — if the property is mortgaged on a residential basis and you receive rent from tenants.
Your mortgage offer and terms will state that the property must be owner-occupied unless the lender agrees otherwise. Letting without permission can trigger:
- A demand to repay the mortgage in full
- Penalty interest or charges
- Difficulty remortgaging or selling
- Potential insurance invalidation
Some landlords assume that letting to family or only “for a few months” does not count. Lenders generally treat any paid letting as letting, regardless of tenant type or duration.
Exceptions are rare and usually very specific (for example, some lenders allow letting under a formal government scheme, or a defined period after purchase). Always check your offer and speak to the lender before marketing the property.
Consent to Let vs Buy-to-Let vs HMO Mortgages
These three are often confused. They solve different problems.
| Consent to let | Buy-to-let mortgage | HMO mortgage | |
|---|---|---|---|
| Starting point | Existing residential loan | New BTL loan (or switch) | New HMO specialist loan |
| Property use | Usually single household / standard let | Single let to one tenant/household | Multiple unrelated tenants sharing facilities |
| Typical term | Temporary permission | Long-term investment | Long-term investment |
| Licensing | Standard landlord rules | Standard landlord rules | Often HMO licensing + stricter standards |
| Rates / fees | May rise slightly; consent fee common | BTL pricing | Specialist HMO pricing |
If you intend to let long term, or to multiple sharers, consent to let is usually the wrong end state. You will likely need to remortgage to buy-to-let or, for a licensed HMO, an HMO mortgage with a specialist lender.
Our HMO vs buy-to-let comparison explains yield and complexity differences. If you are comparing residential ownership with investing, see HMO mortgage vs residential mortgage or speak to a broker about your exit route from consent to let.
When Lenders Grant Consent to Let
Each lender sets its own policy. Common requirements include:
- Payment history — no recent arrears
- Equity — often minimum 20–25% LTV after valuation
- Tenancy type — many restrict to AST with an agent, not corporate lets
- Duration — clear start and end dates
- Insurance — valid landlord (not just buildings) cover
- No HMO use — most residential consents do not allow multi-tenant HMO letting
If you plan to let to five or more people forming more than one household, the property may be an HMO under UK rules. That typically requires an HMO licence and will not be acceptable on standard consent to let. You need HMO-specific finance and compliance — see our HMO licensing guide.
For more on this topic, see our guide to short-term finance.
For more on this topic, see our guide to Buying an Ex-HMO as a Family Home.
How to Apply for Consent to Let
- Read your mortgage terms — find the letting clause and any reference to permission
- Call or message the lender — use the dedicated “consent to let” or “change of circumstances” team
- Submit the form — provide proposed rent, tenancy type, agent details, and insurance
- Pay any fee — often £50–£150 (see our fees guide for typical ranges)
- Get written confirmation — keep the approval letter with your insurance and tenancy paperwork
- Renew if needed — before permission expires, apply again or remortgage to BTL
Be honest about how the property will be let. Misdescribing an HMO as a single family let can invalidate consent and insurance.
What If Your Lender Refuses Consent to Let?
Refusals are common when LTV is high, income is stressed, or the lender is tightening criteria. Options include:
- Remortgage to buy-to-let with a new lender (valuation and rental income assessed)
- Sell if holding is not viable
- Switch lender on residential terms if you will return to live in the property
- Use a broker to find lenders with more flexible “let to buy” or consent policies
If you were refused because the property is suited to multi-let / HMO use, consent to let was never the right product. A broker can outline HMO mortgage requirements and whether conversion and licensing are feasible.
We cover next steps in more detail in what to do if your bank refuses consent to let (companion article).
Costs and Impact on Your Mortgage
Beyond the consent fee, lenders may:
- Increase your interest rate slightly for the permission period
- Restrict further borrowing until you revert to owner-occupation
- Require proof of landlord insurance and gas safety (if applicable)
Consent to let does not usually change the repayment type (capital repayment vs interest-only stays as before unless you negotiate a change).
Insurance and Legal Compliance
Residential buildings insurance is often invalid once you let the property. You need landlord insurance covering buildings, liability, and optionally rent guarantee.
You must also comply with:
- Deposit protection (England: approved scheme within 30 days)
- Right to rent checks
- Gas Safety annual certificate where gas is present
- EICR electrical safety (England: five-year cycle for rentals)
- EPC minimum standards
Letting without consent can complicate claims if the insurer discovers undeclared letting.
Frequently Asked Questions
How long does consent to let last?
Often six to twelve months, renewable subject to lender policy. It is not a permanent letting solution.
Can I let my property on Airbnb with consent to let?
Many lenders exclude short-term/holiday lets on consent. Check policy wording; holiday lets often need specialist mortgages and planning rules.
Does consent to let turn my loan into a buy-to-let mortgage?
No. The loan remains residential with a temporary letting permission. For a permanent let, remortgage to BTL.
Can I use consent to let for an HMO with several tenants?
Usually no. HMO letting requires appropriate licensing and HMO finance. Using residential consent for an HMO is high risk legally and with the lender.
What happens if I let without consent?
You risk breaching mortgage terms, invalidating insurance, and facing enforcement. See letting without consent to let for consequences and remediation.
Next Steps
- Temporary let on a residential loan → apply for consent to let with your lender; use written approval
- Long-term single let → compare buy-to-let remortgage options with a broker
- HMO strategy → review HMO mortgages, licensing, and conversion
For a tailored route from residential ownership to investment finance, see HMO mortgage vs residential, contact our team, or use the HMO mortgage calculator.