Historical guide: written for the circumstances and rules of June 2026. This article forms part of our backdated information archive; it is not a live product quotation.
Moving from Gosport or Fareham towards Southampton or Eastleigh can mean finding more space, changing the commute and taking on a larger mortgage at the same time. Before viewing homes at the top of the budget, work out how much sale equity is really available and what a lender might accept. An upsizing mortgage in Hampshire is a new affordability decision, even if you already have an excellent payment record on your present home.
Work out your usable equity
Start with a realistic sale estimate and subtract the mortgage redemption balance, any early repayment charge and the costs of selling. Estate agency, conveyancing and moving costs all reduce the money available for the next purchase. For example, a £300,000 sale and £180,000 mortgage leave £120,000 before costs, not £120,000 of guaranteed deposit. The final redemption figure and sale price can differ from an initial estimate. Keep a reserve for unexpected bills instead of assuming every pound of equity can safely go into the new home.
Build the new purchase budget separately
The next mortgage is broadly the purchase price less your usable deposit, with any permitted added fees affecting the final loan. Include SDLT, legal costs, surveys and moving expenses outside that deposit figure. As at June 2026, do not use the temporary SDLT thresholds that ended in March 2025 when estimating an English purchase. Existing ownership and whether you are replacing the main residence also matter. Ask the conveyancer for a tailored calculation, particularly if you might complete before selling, because the higher rates may need to be funded initially.
Can you port the current mortgage?
Porting usually means applying to transfer an existing product to a new mortgage on the next property. It is not automatic approval to move the loan regardless of circumstances. The lender assesses the new home and your affordability under its criteria. If you need additional borrowing, that extra part may be on a different product with a different expiry date. Ask what happens if the sale and purchase do not complete together and whether any charge refund conditions apply. The offer's portability wording and lender confirmation matter more than a general description online.
Compare porting with starting again
A new mortgage might provide a simpler combined balance or different features, but leaving the current deal can trigger costs. Compare early repayment charges, new lender fees, the payment on any top-up and the longer-term flexibility. If the existing rate is lower, keeping it may help, but that alone does not prove porting is the best route. A partial port, a larger deposit or a changed term can alter the comparison. Use realistic completion dates and consistent assumptions rather than comparing today's old payment with an incomplete quote for the new home.
Affordability includes the changed household budget
A larger house may bring higher council tax, insurance, heating and maintenance. A different journey to work can change fuel, parking or travel costs. Add childcare, planned leave, existing finance agreements and any reduced or variable income. If you are extending the mortgage term to manage the increase, consider total interest and income later in life. A lender's maximum is not a target you have to reach. Decide what payment leaves room for ordinary life, savings and unexpected repairs, not just what appears possible on an online calculator.
Chains and deadlines need coordination
Keep the estate agent, conveyancer and broker informed about the chain and any change in timing. A mortgage offer has an expiry date, and a delay can require updated evidence or an extension that is not guaranteed. Avoid booking irreversible moving arrangements before the legal position is clear. If your current home is slow to sell, discuss the implications before committing to temporary borrowing or retaining it as a rental. That changes tax, affordability and mortgage-consent questions and is not simply a way to avoid losing the next house.
Review the plan before listing or offering
Have the current mortgage statement, expiry date, likely sale range, savings and income details ready. We can compare the broad routes and help you understand the borrowing before you commit to an asking price or an offer. Easy Mortgages' purchase broker fee is £495 where applicable, with lender, legal and other moving costs separate. The right next home is not just the one with another bedroom. It is the one you can fund through the move and continue to enjoy without the larger mortgage taking over the household budget.
Talk it through with Easy Mortgages
If you would like to understand how this relates to your own plans, contact Easy Mortgages for an initial conversation. We can explain the next steps and the information a personalised review would need, without assuming a particular product is right for you.
This is general information, not personal mortgage, insurance, legal or tax advice. Rules, lender criteria and products can change after June 2026. Any recommendation requires an assessment of your circumstances. Your home may be repossessed if you do not keep up repayments on your mortgage or other borrowing secured on it.
Further reading: HMRC residential SDLT rates. Official guidance may subsequently be updated; the explanation above is framed for the archive date.