Mortgage Porting, Blending and Extending Explained

By the Ottawa Mortgages editorial team · Last reviewed: September 2026 · How we write our guides

What is mortgage porting? Porting means transferring your existing mortgage, with its rate and terms, to a new property so you can avoid a prepayment penalty when you move. Blending and extending is a different tool that combines your current rate with a new one for a longer term. Both depend on your lender’s policies and on your qualifying again.

If you are moving during your term, you have options besides breaking the mortgage and paying a penalty. Here is how the main ones work.

Porting your mortgage

  • You move your mortgage to a new home, keeping the same rate, term and terms.
  • Lenders typically require the new purchase to close within a set window, often around 90 to 120 days of the sale.
  • You must qualify for the new property and the new mortgage amount.
  • If the new mortgage is larger, the extra amount is often blended at current rates.

Porting is most valuable when your existing rate is lower than current rates or when your penalty would be large.

Blend and extend

With a blend-and-extend, your lender combines your current rate with today’s rate for a new, longer term. You avoid a penalty and may lower your rate somewhat, but the blended rate is usually higher than the best market rate.

Increasing your mortgage when you port

If you need more money for the new home, the lender may add a new portion at current rates. You then have a blended rate on the combined amount.

Comparing the options

OptionGood forWatch out for
PortLow existing rate and a move within the termTight timing windows and requalifying
Blend and extendAvoiding a penalty when rates have risenYou may not get the best current rate
Break and pay the penaltyBig savings from a new ratePenalty size. See penalty guide.
Sell and start fresh at renewalA move near the end of your termTiming your sale and purchase

Questions to ask your lender

  1. Is my mortgage portable, and for how long after I sell?
  2. What happens if the new home costs less?
  3. How would a blended rate be calculated?
  4. Are there fees or requalifying requirements?

Frequently asked questions

Do all mortgages allow porting?

No. Many do, but some products and lenders restrict it. Check your contract before you sign.

Can I port to a different lender?

No. Porting is done with the same lender. Moving to another lender generally means paying out the mortgage.

Will I have to requalify?

Usually yes, for the new property and mortgage amount.

Moving during your term? Compare your options

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Important: Ottawa Mortgages is an independent information and referral service. We are not a lender, mortgage broker or mortgage brokerage, and we do not give mortgage advice or make credit decisions. If you ask to be connected, your details may be shared with a licensed Ontario mortgage professional, who may compensate us. Rates, rules and eligibility change often. Confirm details with a licensed professional and official sources, and check any Ontario mortgage broker’s licence with FSRA. Read our full disclosure.

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