The choice between an unsecured homeowner loan and a secured second charge mortgage for funding a conservatory ultimately comes down to how much you need to borrow, and how comfortable you are putting your home behind that borrowing.

The basic split: unsecured borrowing vs borrowing secured on your home

An unsecured personal loan or homeowner loan for a conservatory isn’t tied to your property as security, meaning the lender can’t repossess your home directly if repayments are missed, though missed payments still damage your credit file and can lead to debt recovery action. A second charge mortgage, by contrast, is secured against your property in addition to your existing (first charge) mortgage, which generally allows for larger loan amounts and potentially lower interest rates than unsecured borrowing, but at the cost of your home itself being at risk if repayments aren’t kept up.

What a second charge mortgage actually is

MoneyHelper’s guidance describes a second charge mortgage as a loan secured on your property taken from a lender other than your main mortgage provider, sitting behind your existing mortgage in priority. It’s commonly considered specifically where your existing mortgage lender won’t lend you more under your current arrangement, or where you don’t want to remortgage and lose a good existing interest rate by increasing your borrowing through your main mortgage instead.

The real cost and risk trade-off

MoneyHelper’s guidance is direct that the interest rate on a second charge mortgage is often higher than your existing first mortgage rate, but is typically still lower than the rates you’d find on an unsecured personal loan or on credit cards — reflecting that the lender has property security behind the loan. The trade-off is equally direct: because it’s secured against your home, MoneyHelper’s guidance warns that you could lose your home if you don’t keep up the repayments, a consequence that simply doesn’t apply in the same way to an unsecured loan.

A further advance from your existing lender, as a third option

Rather than taking out a completely separate second charge mortgage, some homeowners are able to borrow more from their existing mortgage lender directly, known as a further advance — effectively increasing the size of your existing mortgage rather than adding a second, separate secured loan behind it. Whether this is available, and on what terms, depends on your existing lender’s criteria and how much equity you have in the property, so it’s worth asking your current lender what they’d offer before assuming a second charge mortgage with a new lender is the only secured option.

Questions worth asking before you borrow for a conservatory specifically

Given a conservatory sits at the lower end of home extension costs, it’s worth genuinely questioning whether the loan amount needed justifies putting your home at risk through secured borrowing at all, versus a smaller unsecured loan, savings, or simply scaling back the specification. Comparing the total cost of borrowing — not just the headline interest rate, but arrangement fees, valuation fees and any early repayment charges — across at least an unsecured option and a secured option gives a genuinely comparable picture before committing to either route.

FAQs

Is a second charge mortgage the same as remortgaging?

No — remortgaging replaces your existing mortgage with a new one (potentially with a new lender), while a second charge mortgage sits alongside your existing mortgage as a separate, additional loan secured on the same property.

Can I get a second charge mortgage with bad credit?

It’s generally more difficult and more expensive, since second charge lenders assess affordability and credit history similarly to other secured lending, though some specialist lenders focus specifically on this market — comparing terms carefully matters even more in this situation.

Is an unsecured loan always cheaper overall for a conservatory-sized project?

Not necessarily in interest rate terms, since secured lending often has a lower rate, but an unsecured loan avoids putting your home directly at risk and often has simpler, faster approval — which one is genuinely cheaper depends on the loan amount, your credit profile and the specific rates on offer.

Sources

This guide draws on the following primary sources, current as of 18 September 2026:

• MoneyHelper: Second charge or second mortgages

Related guides

Compare Conservatories is an independent guide. We may earn a fee from some links; this never affects what we write. This article is general information, not legal or planning advice on any specific property — always confirm requirements directly with your local planning authority.