Selling your home is not just a property decision. If you have a mortgage, it can affect when you move, how much equity you have, whether you can port your existing deal, and how much you may be able to borrow for your next property.
The first step is to understand the numbers before you accept an offer or commit to an onward purchase. Ask your lender for a mortgage redemption figure, check whether any early repayment charge applies, and work out your likely sale proceeds after selling costs.
GOV.UK says selling a home takes about 5 months on average, although it can take longer if you are in a chain. Your own timescale may be shorter or longer depending on the property, buyer, lender, conveyancer, survey, searches and wider market conditions.
This guide explains the mortgage side of selling your home, the documents to prepare, common costs and when it is sensible to speak to a broker before you make firm plans.
This is general guidance only and is not personal mortgage, legal or tax advice. Your options depend on your circumstances, lender criteria, the property involved and the market at the time you apply.
Key takeaway: Selling your home is not just a property decision. If you have a mortgage, it can affect when you move, how much equity you have, whether you can port your existing deal, and how much you may be able to borrow for your next property.
What is the first thing to do when selling your home?
The first practical step is to check your mortgage position, even before you choose an estate agent or set an asking price.
Ask for:
- your current mortgage balance
- a redemption figure for the date you expect to repay the mortgage
- any early repayment charge, exit fee or administration fee
- whether your current mortgage product is portable
- when your current mortgage deal ends
- whether there are restrictions on overpayments or partial repayment
A redemption figure shows what would be needed to repay the mortgage at a specific point in time. It can change as interest, payments and completion dates change, so it should be refreshed as the sale progresses.
You should also start building a realistic moving budget. The sale price is not the amount you will have available for your next purchase. Your available equity may be reduced by your outstanding mortgage, selling costs, legal fees, moving costs and any mortgage charges.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
What does selling your home mean for your mortgage?
Selling your home normally means one of four mortgage outcomes:
| Situation | What usually happens | Mortgage point to check |
|---|---|---|
| You sell and do not buy again | Your mortgage is normally repaid from the sale proceeds on completion | Check the redemption figure, exit fee and any early repayment charge |
| You sell and buy another home | Your existing mortgage may be repaid, ported or replaced | Check affordability, deposit, product terms and timing |
| You port your mortgage | You apply to move the existing mortgage product to a new property | Porting is usually subject to lender approval and a new assessment |
| You borrow more | Extra borrowing may be added with your existing lender or arranged through a new lender | Check affordability, rate structure, fees and lender criteria |
A portable mortgage does not mean automatic approval. Porting usually means you can apply to transfer the current mortgage product to a new property, subject to the lender's rules. The lender will normally reassess your income, commitments, credit profile and the new property.
If you need to borrow more, the extra borrowing may sit on a different rate from your existing product. If you move to a cheaper property or reduce the mortgage, an early repayment charge may apply to the amount you repay, depending on your mortgage terms.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
How much does it cost to sell a house?
The exact cost depends on your property, mortgage, estate agent, conveyancer and moving plans. You should avoid relying on a rough estimate if the numbers are tight.
Common selling costs include:
| Cost | What to check | Why it matters |
|---|---|---|
| Estate agent fee | Percentage fee or fixed fee, plus VAT where applicable | Reduces the equity available after sale |
| Conveyancing fee | Legal fee and any disbursements | Needed to handle the legal transfer and mortgage repayment |
| EPC | Whether you already have a valid Energy Performance Certificate | In England and Wales, sellers generally need an EPC when marketing a property |
| Mortgage early repayment charge | Whether your current product charges you for repaying early | Can materially affect whether to sell now, wait or port |
| Mortgage exit/admin fee | Any lender fee for closing the mortgage account | Should be included in the redemption calculation |
| Removal and storage costs | Quotes based on distance, volume and timing | Often underestimated, especially in a chain |
| Onward purchase costs | Stamp Duty Land Tax or equivalent, survey, valuation, legal work and mortgage fees | These affect how much deposit you can use for the next purchase |
Citizens Advice explains that if you are planning to sell your home, you must provide an Energy Performance Certificate to potential buyers. An EPC rates the energy efficiency of a property from A to G. Requirements and processes can vary across the UK, so check the rules that apply where the property is located.
If you are buying another home, do not separate the selling budget from the buying budget. They interact. A lower sale price, higher mortgage charge or higher moving cost can reduce your onward deposit and affect the loan-to-value available to you.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
Do you need a solicitor or conveyancer when selling?
Most sellers use a solicitor or licensed conveyancer to deal with the legal work. They usually handle the contract pack, enquiries, title checks, redemption of the mortgage and completion monies.
You should instruct a conveyancer early enough to avoid delays after accepting an offer. This is particularly important if:
- your property is leasehold
- there is a management company or freeholder involved
- you have a Help to Buy, shared ownership or other scheme-related property
- there has been building work, an extension or a change of use
- you are selling after a separation, death or transfer of ownership
- there are title restrictions, rights of way or boundary issues
A mortgage broker cannot replace legal advice. A broker deals with borrowing options and lender criteria. A conveyancer deals with the legal transfer of the property. If there are tax questions, you may need tax advice.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
What documents should you prepare before selling?
The smoother sales are often the ones where the documents are ready before the buyer's solicitor starts asking questions.
Useful documents include:
- proof of identity and address
- your latest mortgage statement
- redemption information from your lender
- the property title information, if available
- Energy Performance Certificate
- building regulation certificates for relevant works
- planning permission documents, where applicable
- guarantees or warranties for windows, roofing, damp works or structural works
- electrical, gas or boiler certificates, where available
- lease, service charge and ground rent information for leasehold properties
- management pack details for flats or managed estates
- insurance claim history, if relevant
- details of disputes, notices or restrictions affecting the property
If you are selling and buying another home, also prepare your mortgage documents for the next application:
- payslips or accounts
- bank statements
- proof of deposit and equity
- credit commitments
- details of bonuses, overtime, commission or self-employed income
- ID and proof of address
- details of the property you want to buy
Missing documents can slow down a sale or cause a buyer to renegotiate. They can also affect a lender's view of the property if you are buying onward.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
How do you work out your equity when selling?
Your equity is not simply the expected sale price minus the mortgage. You need to allow for the cost of selling and any mortgage charges.
A practical calculation is:
| Item | Example treatment |
|---|---|
| Expected sale price | Starting point for sale proceeds |
| Less outstanding mortgage | Usually repaid on completion |
| Less early repayment charge, if applicable | May reduce available equity |
| Less estate agent and legal costs | Reduces the net sale proceeds |
| Less moving and storage costs | Reduces funds available for the next purchase |
| Less onward purchase costs | Affects your usable deposit |
| Estimated available equity | Potential deposit and cost fund for the next property |
If you are close to a loan-to-value boundary, small changes matter. For example, a lower sale price, a higher early repayment charge or extra legal cost could reduce the deposit available for the next purchase. That may affect the mortgage products available, although the outcome depends on lender criteria at the time.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
A common trap: relying on the sale price as your deposit
A couple agree a sale at a price that feels comfortably above their outstanding mortgage. They start viewing onward properties and make an offer assuming the difference between the sale price and mortgage balance will be their deposit.
The problem appears when the full numbers are checked. Their current fixed rate still has time to run, so the redemption figure includes an early repayment charge. Estate agent fees, conveyancing, removals and onward purchase costs also reduce the cash available. By the time these are allowed for, their usable deposit is lower than expected.
That matters because the onward mortgage is not assessed on the sale price of the old home. It is assessed on the actual deposit, the new purchase price, current income, credit commitments and the lender’s criteria. A smaller deposit can push the case into a different loan-to-value band or narrow the lender choice. If they are also trying to port, the existing lender may still need to approve the new borrowing and the new property.
A broker would usually want to see:
- the latest mortgage balance and redemption figure
- the product end date and any early repayment charge
- realistic selling and moving costs
- the expected onward purchase price
- income evidence and current credit commitments
- whether porting is available and whether it still fits the plan
The lesson is simple: before treating equity as deposit, turn the sale price into a net figure. If the numbers are tight, check the mortgage route before accepting chain deadlines or increasing an onward offer.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
Can you sell your home and keep your mortgage rate?
Possibly, but only if your lender allows porting and your circumstances fit its criteria.
Porting is often misunderstood. It usually means applying to transfer the existing mortgage product to a new property. It does not usually mean the lender must approve the move automatically.
The lender may check:
- your current income and employment status
- credit history and commitments
- affordability for the new mortgage
- the value and condition of the new property
- the loan-to-value
- whether you are borrowing more or less
- whether completion dates fit the product rules
- whether the existing product is still portable under the terms
If you need additional borrowing, the extra amount may be on a different product and rate. If you borrow less, there may be a charge on the part of the mortgage you repay. Product terms vary, so check your original mortgage offer and your lender's current rules.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
Should you sell now, wait or port?
There is no single answer. The right route depends on the numbers, your plans and your tolerance for delay or cost.
| Option | When it may be worth exploring | Main trade-off |
|---|---|---|
| Sell now and repay the mortgage | You are not buying again, or the move is more important than keeping the deal | Early repayment charges may apply |
| Sell and port the mortgage | You have a favourable existing product and the lender may accept the new property and affordability | Porting is not guaranteed and extra borrowing may be on a different rate |
| Wait until the mortgage deal ends | The early repayment charge is high and your moving plans are flexible | You may delay the sale or miss a property you want to buy |
| Switch to a new lender | Your current lender is not suitable for the onward purchase | New affordability checks, fees and rates apply |
| Sell first, buy later | You want to avoid a chain or strengthen your buying position | You may need temporary accommodation and the market may move while you wait |
A broker can help compare the routes, but cannot guarantee approval, a particular rate or a specific lender outcome.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
What can make selling and moving harder?
Selling becomes more complicated when the property transaction and mortgage decision depend on each other.
Common issues include:
- an early repayment charge that ends after your desired completion date
- a buyer who needs a mortgage and survey before proceeding
- a chain where several completion dates must align
- leasehold information delays
- building work without clear paperwork
- a down valuation on the property you are buying
- income changes since your last mortgage application
- recent credit issues
- a new job, probation period or self-employment
- variable income such as bonus, overtime or commission
- needing to remove or add someone to the mortgage
- buying a non-standard property
- relying on a sale price that is not yet agreed
The hardest part is often not one single issue. It is the combination of timing, evidence and assumptions. For example, you may be able to afford the next mortgage, but not with the lender you expected. Or your current mortgage may be portable, but the new property may not fit that lender's criteria.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
What mistakes should sellers avoid?
The most common mistake is treating the asking price as guaranteed money. An asking price is not a sale price, and a sale price is not your net equity.
Other mistakes include:
- assuming porting is automatic
- accepting an offer without checking mortgage charges
- committing to an onward purchase before checking affordability
- relying only on an online calculator
- forgetting estate agent, legal, moving and purchase costs
- assuming a lender valuation will match the agreed price
- not checking leasehold or management pack delays early
- applying to a lender before checking whether your income fits its criteria
- leaving mortgage advice until after the chain is under pressure
- ignoring how a fixed-rate end date affects completion timing
The risk is not just being declined. It is losing time, increasing stress in the chain, or discovering too late that the route you expected is not practical.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
What could selling your home look like in practice?
Example 1: Selling and buying at a similar price
You are selling your home and buying another property at a similar price. Your existing mortgage is on a fixed rate with time remaining.
Key questions:
- Is there an early repayment charge if you repay the mortgage?
- Is the product portable?
- Would the lender approve the new property?
- Has your income or credit position changed?
- Would a new lender be more suitable than porting?
Porting may be worth exploring, but it is not automatic. If the lender's current assessment does not support the move, you may need another route.
Example 2: Upsizing and borrowing more
You are selling your current home and buying a more expensive property. You expect to use equity as the deposit and borrow more.
The lender will usually assess affordability for the total borrowing required. If you stay with your existing lender and port your current product, the additional borrowing may be arranged separately and may be priced differently.
The key issue is whether the extra borrowing fits current lender criteria.
Example 3: Downsizing before a fixed rate ends
You are selling to move to a lower-value property. You expect to reduce the mortgage significantly or repay it completely.
The main issue may be the cost of repaying part or all of the mortgage during a product period. If an early repayment charge applies, it could affect whether you sell now, wait, port part of the mortgage or repay and accept the cost.
This decision should be based on the actual numbers, not a general rule.
Example 4: Selling after your income has changed
You bought your current home while employed. You are now self-employed and want to sell and buy again.
The lender will not usually rely only on the fact that you already have a mortgage. It will assess the new application based on current income evidence and criteria. Some lenders take different approaches to self-employed income, trading history, retained profits and fluctuating income.
This does not mean you cannot move. It means lender choice and evidence matter.
Example 5: Selling in a tight chain
You are selling and buying in a chain, and completion dates are uncertain.
The mortgage risk is timing. Your mortgage offer, product expiry, early repayment charge date and completion date may not line up neatly. If there is a delay, you may need an offer extension or revised plan. If completion moves earlier, charges may be triggered.
Good communication between your broker, lender, conveyancer, estate agent and the rest of the chain becomes important.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
When should you speak to a broker before selling?
Speak to a broker early if the sale affects your next mortgage decision.
A broker can help you look at:
- whether your current mortgage has early repayment charges
- whether porting may be available and worth considering
- how much you may be able to borrow for an onward purchase
- which lenders may consider your income and circumstances
- whether staying with your current lender or moving lender looks more practical
- what documents you may need before applying
- how sale proceeds affect your onward deposit
- whether your plan is vulnerable to timing issues
This is particularly important if:
- you are self-employed
- your income includes overtime, bonus, commission or contract work
- you have had credit issues
- you are separating or changing names on the mortgage
- you are buying a non-standard property
- you need to complete by a particular date
- you are close to the end of a fixed rate
- you are unsure whether to port or remortgage
James Blackler at The Mortgage Blog usually recommends checking the mortgage position before the property goes on the market if an early repayment charge, fixed-rate deal or onward purchase is involved. It is easier to make a calm decision before you have a buyer, a chain and a deadline.
If your situation is not straightforward, you can speak to a mortgage adviser or make a finance enquiry before you apply.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
What would a broker check first?
| Broker check | Why it matters | What a cleaner case shows |
|---|---|---|
| Existing mortgage terms | Charges and porting rules may affect the route | Redemption figure, product end date and porting terms are clear |
| Affordability | A new mortgage is assessed on current circumstances | Income, commitments and deposit are evidenced |
| Lender fit | Different lenders treat income, credit and property risks differently | The route matches lender criteria rather than a generic assumption |
| Property details | The property is the lender's security | Tenure, condition, valuation and legal points are understood |
| Timing | Offers, chains and product deadlines can clash | Completion plans allow time for valuation, underwriting and legal work |
| Fallback route | A one-lender plan can be fragile | There is a second route if the preferred option changes |
The Financial Conduct Authority sets the regulatory framework for mortgage firms, including responsible lending and advice standards. In practical terms, a lender or adviser should not assume a mortgage is affordable simply because you already have one.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
What should you prepare before asking for mortgage help?
Before speaking to a broker, prepare a short summary of:
- your current property value or expected sale price
- your outstanding mortgage balance
- your current lender and mortgage product end date
- any known early repayment charge
- whether you want to sell only, downsize, upsize or buy at a similar price
- the expected purchase price of the next property, if known
- your income and employment position
- regular credit commitments
- deposit source and expected equity
- any credit issues or recent financial changes
- target timescale and any hard deadline
- whether you want to explore porting, a new lender or both
The aim is not to produce a perfect application on day one. It is to spot the issues that could affect the route before you make commitments.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
How can interest rates affect selling and buying?
The Bank of England explains that Bank Rate influences interest rates across the economy. Mortgage rates are not the same as Bank Rate, and lenders price products based on many factors, but the wider interest-rate environment can affect affordability and product choice.
If you last took a mortgage several years ago, your next application may be assessed differently. Your income, commitments, mortgage term, deposit and the lender's criteria all matter.
This is one reason selling and buying again should not be treated as a simple transfer of your old mortgage position.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
What if you are selling a second home or investment property?
This guide focuses mainly on selling your home. If you are selling a buy-to-let, second home or property held through a company, the mortgage and tax position may be different.
You may need advice on:
- buy-to-let mortgage redemption
- capital gains tax considerations
- limited company property finance
- rental income treatment
- portfolio landlord criteria
- whether the sale affects future borrowing
Tax outcomes depend on your circumstances, so speak to a qualified tax adviser or accountant if you are unsure. You can also read about buying property limited company vs personal name and specialist lending options.
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
What is the strongest next step when selling your home?
If you have no mortgage and are not buying again, your next step is usually to prepare the property, choose how to sell and instruct a conveyancer.
If you have a mortgage or plan to buy another home, your next step is to check the mortgage numbers before you rely on the sale proceeds.
Use this quick checklist:
- Get your mortgage balance and redemption figure
- Check early repayment charges and product end date
- Confirm whether porting is available in principle
- Estimate sale proceeds after all selling costs
- Estimate onward purchase costs and deposit
- Check affordability before making an offer on another property
- Prepare documents for the sale and mortgage application
- Speak to a broker if porting, borrowing more or timing is uncertain
The useful question is not just, what is the lowest rate? It is, which route fits the sale, the purchase, the timing and the lender criteria?
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
What should you read next?
- Speak to a mortgage adviser
- Make a finance enquiry
- Mortgage fees explained
- Mortgage with no early repayment charge
- How long does it take to get a mortgage?
- Quick guide to UK mortgage types
- What is a lock-in agreement?
- Finance hurdle in UK property
- What is an offset mortgage?
- 7 reasons to use a property search agent
Want personalised mortgage advice?
Speak to The Mortgage Blog before you apply so we can help you check lender fit, documents and next steps for guide selling your home.
FAQs
What is the first thing I should do when selling my house?
If you have a mortgage, start by checking your mortgage balance, redemption figure, early repayment charges and porting rules. Then estimate your likely sale proceeds after fees and moving costs.
Can I sell my house before my fixed rate ends?
You may be able to, but an early repayment charge may apply if you repay the mortgage during the fixed-rate period. Check your mortgage offer or ask your lender for a redemption figure before making plans.
Can I move my mortgage to a new property?
Possibly. This is known as porting, but it is usually subject to lender approval, affordability checks and the new property meeting the lender's criteria.
Do I need a solicitor to sell my home?
Most sellers use a solicitor or licensed conveyancer to handle the legal work, mortgage redemption and completion process. A conveyancer is particularly important where there is a mortgage, leasehold property, title issue or chain.
How long does selling a home take?
GOV.UK says selling a home takes about 5 months on average, but timing can vary. Chains, surveys, mortgage offers, searches, legal enquiries and buyer circumstances can all affect the timescale.
Will my lender let me borrow the same amount again?
Not necessarily. If you are buying again, the lender will usually assess affordability based on your current circumstances and criteria. Income changes, credit commitments, interest rates, deposit size and property type can all affect the outcome.
Should I sell first or buy first?
It depends on your finances, market conditions and appetite for risk. Selling first may reduce chain pressure but could mean arranging temporary accommodation. Buying before your sale is secure can increase financial and timing risk. If a mortgage is involved, check affordability and funding before committing.
