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An HMO remortgage involves more moving parts than a standard buy-to-let refinance. There are more documents to gather, more lender criteria to satisfy, and more potential points of delay. Landlords who approach it in an organised, methodical way consistently get better outcomes — lower rates, smoother completions and no gap on a costly reversion rate.
This guide walks through each stage of the process in sequence, explains what to prepare at each point, and identifies the delays that most commonly cause problems so you can avoid them.
How Long Does an HMO Remortgage Take?
The typical timeline from instructing a broker to completion is 8 to 12 weeks. Some straightforward cases complete faster; more complex properties — large HMOs, mixed tenure, properties with licensing complications — can take longer. For this reason, the standard advice is to start the process six months before your current deal ends. That gives you time to resolve any issues before they become critical path problems, and it allows you to submit an application early enough to secure a rate offer while still holding your current deal.
If you wait until two months before your deal ends, you are running a real risk of falling onto your lender's reversion rate — typically 7.5% to 9.5% for HMO products — for weeks or months while your remortgage completes.
Step 1: Check Your Current Deal
Before doing anything else, you need to know exactly where you stand with your existing mortgage. Find your original mortgage offer document and establish:
Early repayment charge (ERC) dates and percentages. ERCs on HMO mortgages typically run from 1% to 5% of the outstanding loan balance, decreasing each year through the fixed period. A 2% ERC on a £350,000 mortgage is £7,000 — a cost that must be factored into any decision to switch before your deal ends. If you do not have your mortgage offer, contact your lender directly and ask them to confirm your ERC schedule in writing.
Your reversion rate. This is the rate you will move onto when your fixed or discounted period ends. It is almost always significantly higher than a remortgage product you could arrange. Knowing this number tells you the cost of delay.
Your current outstanding balance. You need this to calculate your current LTV (outstanding balance divided by current property value) and to model what a new mortgage at 65% or 75% LTV would look like.
Your deal end date. Mark this in your diary. Work back six months from that date — that is your target start date for the remortgage process.
Step 2: Get Your Property Valued
Your LTV — and therefore your rate — depends on the current market value of the property. HMO valuations are carried out differently to standard residential valuations. Surveyors consider both the capital value (bricks-and-mortar) and the investment value (based on rental yield). In some cases the investment method produces a higher figure; in others, particularly where rents are below market rate or there are licensing complications, it can work against you.
Before a formal lender valuation, it is worth getting a realistic sense of current value. You can do this by:
- Asking a local agent who deals in HMO investment property for an informal opinion
- Reviewing recent sales of comparable HMOs on the same streets or in the same area
- Talking to your broker — experienced HMO brokers have seen enough valuations to give you a realistic expectation
Knowing your likely valuation in advance allows you to target the right LTV tier. If you think the valuation will come in at £400,000, borrowing £260,000 puts you at 65% LTV and opens up the most competitive rate tier. Borrowing £280,000 puts you at 70% LTV. The difference in rate between those two positions is meaningful over a five-year fix.
Step 3: Check Your HMO Licence Is Current
This is a step many landlords underestimate until it becomes a problem. Most HMO lenders require a current, valid HMO licence before they will proceed — and many want to see it at application, not just at completion.
Check the following:
Expiry date. HMO licences are typically issued for five years. If yours expires within the next six months, consider applying for renewal before you start the remortgage process. A licence with one month left to run is a red flag for underwriters, even if renewal is in progress.
Conditions. Read the conditions attached to your licence. If there are any outstanding requirements — fire safety upgrades, room size compliance, works to be completed — address them. Lenders may commission surveyors who will flag licence condition breaches.
For more on this topic, see our guide to HMO Bridging Finance Lender Criteria & Requirements.
Correct type of licence. Mandatory licensing applies to most HMOs occupied by five or more people in two or more households. Additional or selective licensing may apply in your local authority area regardless of property size. Make sure the licence you hold is the correct one for your property. A property that requires a licence but does not have one is unmortgageable with all mainstream HMO lenders.
Name on the licence. If the licence is in your personal name but you are remortgaging through a limited company, or vice versa, there will be a discrepancy that needs to be resolved with the local authority.
Step 4: Instruct a Specialist Broker Six Months Early
Six months before your deal ends, instruct a broker who specialises in HMO mortgages. This timing matters for several reasons.
First, many lenders will hold a rate offer for three to six months from the date of formal offer. If you apply five months before your deal ends, you may be able to secure a rate now without completing until your ERC period has passed — meaning you get the rate today without paying to exit early.
Second, the application and underwriting process takes time. An experienced HMO broker will know which lenders are currently fast and which are slow, which ones have appetite for your property type, and which have recently changed their criteria. That market knowledge reduces the risk of wasted applications.
Third, if there are any problems — valuation shortfall, licensing issue, documentation gap — you have time to fix them rather than completing in a rush with whatever lender will move fastest.
A broker with access to 30 or more HMO lenders can search the market properly on your behalf, present your case in the best light, and negotiate where there is room to do so. You can find out more about how we work at The HMO Mortgage Broker.
Step 5: Gather Your Documents
HMO remortgage applications require more documentation than a standard buy-to-let. Having everything ready before you apply avoids the back-and-forth that slows underwriting down. Here is what you will typically need:
About the property:
– HMO licence — current and valid
– Schedule of accommodation — a document listing each lettable room, its dimensions, current rent, tenant name and tenancy term
– Current tenancy agreements for each tenant
– Energy Performance Certificate (EPC) — must currently be at least a grade E to be mortgageable; check for any upcoming regulatory changes
– Gas safety certificate — current
– Electrical installation condition report (EICR) — must be in date (typically five years)
– Buildings insurance schedule showing the property is insured for the full reinstatement value
For more on this topic, see our guide to How to Build a HMO Portfolio: Financing Strategies.
About the income:
– Six to twelve months' bank statements showing rental income being received
– Letting agent statements if the property is managed by an agent
– Void history — be prepared to explain any gaps in occupancy
About you:
– Last two to three years' SA302 tax calculations and tax year overviews (available through HMRC's online service)
– Three to six months' personal bank statements
– Proof of identity and address — passport, driving licence, recent utility bill
– Accountant's certificate or signed accounts if borrowing through a limited company
– Existing mortgage statement for the property being remortgaged
If you own multiple properties, lenders will typically want a portfolio schedule — a list of all investment properties, their outstanding mortgages, current values and rental incomes. This is used to assess your overall portfolio borrowing against income.
Step 6: Application and Underwriting
Once your broker has identified the most suitable lender and product, they will submit the formal application. Here is what happens during underwriting:
Initial assessment. The lender reviews the application against their criteria — property type, LTV, stress test, borrower profile. Most lenders issue a decision in principle quickly (within 24–48 hours for straightforward cases), but this is not a binding offer.
Valuation. The lender instructs a surveyor to value the property. HMO valuations typically take one to three weeks depending on the surveyor's availability and the complexity of the property. If the valuation comes back lower than expected, your broker can either negotiate with the surveyor (where there is a genuine comparable that has been missed) or identify an alternative lender whose panel surveyor may take a different view.
Underwriting review. Once the valuation is in, the underwriter reviews the full application including income, rental evidence, licence and documentation. They may raise queries — questions about a specific tenant's situation, clarification on a room that appears unusually large or small, confirmation of how a void period was handled. Answer these promptly and clearly. Every day a query sits unanswered is a day added to the timeline.
Formal mortgage offer. When underwriting is complete, the lender issues a formal mortgage offer. This is the binding commitment. Check it carefully against what you were quoted — rate, term, LTV, any special conditions — before proceeding.
Step 7: Legal Work and Completion
Once you have a formal mortgage offer, the legal work begins. On a remortgage, the legal work typically involves:
- New lender's solicitors reviewing the title and preparing the new mortgage documentation
- Redemption statement obtained from your existing lender
- Land Registry searches and title checks
- Transfer of charge — removing the old lender's charge and registering the new one
For a straightforward remortgage to a new lender, legal work typically takes three to six weeks from offer to completion. Some lenders offer a free legal service using their own panel solicitors, which can reduce cost and simplify coordination. Others require you to instruct your own solicitor — worth factoring into your overall cost.
On the completion date, your new mortgage funds are used to repay the old one. Any equity you are releasing is paid to you at this point, minus legal fees.
Common Delays and How to Avoid Them
Licensing problems
The issue: Licence expired, wrong licence type, conditions outstanding.
The fix: Check your licence status before you apply and address any issues first. Do not assume your licence is fine because you have not heard from the local authority.
Slow valuation
The issue: Surveyor availability, complex property, unusual construction or layout.
The fix: Ask your broker which lenders have the fastest valuation turnaround in your area. Ensure the property is presentable and that the surveyor can access all rooms on the inspection day.
Documentation gaps
The issue: Missing SA302s, incomplete tenancy agreements, gaps in rental income evidence.
The fix: Assemble the full document list before you apply. Request SA302s from HMRC well in advance — they can take time to process if submitted by post.
Valuation shortfall
The issue: The property values lower than expected, changing your LTV position.
The fix: Research comparables before the valuation and pass any relevant evidence to your broker. If the valuation is challenged, your broker can request a review with supporting data.
Legal delays
The issue: Title complications, slow solicitors, outstanding charges on the title.
The fix: Use a solicitor experienced in HMO remortgages. Check your title yourself (your solicitor can pull it from Land Registry) for any charges or restrictions that might complicate the process.
Application submitted too late
The issue: Falling onto the reversion rate while the remortgage is still in progress.
The fix: Start six months before your deal ends. No other mitigation compares to having adequate time.
Summary Checklist
- Confirm ERC dates and reversion rate from your current lender
- Get an informal valuation from a local agent or your broker
- Check your HMO licence — expiry date, conditions, correct type
- Instruct a specialist HMO broker six months before your deal ends
- Assemble full documentation: licence, schedule of accommodation, tenancy agreements, SA302s, bank statements, portfolio schedule
- Submit application and respond promptly to any underwriting queries
- Review formal mortgage offer carefully before accepting
- Instruct solicitors and progress legal work to completion
An HMO remortgage done well is straightforward. The landlords who have problems are almost always those who left it too late, had licensing issues they were unaware of, or approached lenders without appropriate specialist support.
Frequently Asked Questions
How long does an HMO remortgage take?
A typical HMO remortgage takes 4-8 weeks from application to completion. This includes: mortgage application and decision in principle (1-2 days), valuation (1-2 weeks), formal offer (1-2 weeks), and legal work including redemption of existing mortgage (2-4 weeks). Using the same solicitor for both sides can speed up the process.
What documents do I need for an HMO remortgage?
You will need: proof of identity and address, 3-6 months of bank statements, evidence of rental income (tenancy agreements or letting agent statements), your current mortgage statement, the HMO licence, EPC certificate, details of any other properties you own, and proof of personal income. Having these ready before you apply speeds up the process significantly.
Can I remortgage an HMO that needs repairs?
Minor repairs are unlikely to prevent a remortgage, but significant structural issues, damp, or fire safety deficiencies may cause the surveyor to issue a retention (holding back part of the loan until repairs are completed) or down-value the property. Address any known issues before the valuation if possible, particularly fire safety items as these are scrutinised closely on HMO valuations.
Do I need to inform my tenants about an HMO remortgage?
You are not legally required to inform tenants about a remortgage as their tenancy agreements remain unaffected. However, you should tell your letting agent and insurance provider. If the new lender requires any property inspections, you will need to coordinate access with tenants. Rent payments should continue as normal — the new lender simply replaces the old one.