A HELOC (home equity line of credit) is a revolving credit facility secured against your property. Unlike a standard secured loan, which provides a lump sum at completion, a HELOC gives you a pre-approved facility that you can draw from as needed during a defined draw period, typically two to five years in the UK. During the draw period, you pay interest only on the amount drawn. When the draw period ends, the outstanding balance converts to capital-plus-interest repayments over the remaining term.

The revolving feature is the key structural difference. As you repay drawn amounts during the draw period, the repaid amount becomes available to draw again. This makes a HELOC particularly suited to phased spending needs such as staged building work, termly school fees, or situations where the total amount needed is uncertain. A standard secured loan, by contrast, provides the full amount on day one with no ability to redraw.

A standard secured loan typically carries a similar or lower interest rate and significantly lower fees than a HELOC. The HELOC is not inherently cheaper; its advantage comes from the interest saving on the undrawn portion during the draw period. Whether that saving outweighs the higher fees depends on the draw pattern, the rate difference, and the amounts involved. The guide to home equity loan vs HELOC covers the full structural comparison, and the HELOC vs lump sum comparator models the cost difference for your own figures.

During the draw period, you make interest-only payments on the amount you have drawn. No capital repayment is required, though you can choose to overpay and reduce the balance if you wish. Interest is charged only on the drawn balance, not on the full facility limit, so if you have drawn £20,000 from a £50,000 facility, you pay interest only on the £20,000.

This means draw-period payments are lower than they will be during the repayment period. When the draw period ends, the outstanding balance converts to capital-plus-interest repayments over the remaining term, and monthly payments will increase. The size of this increase depends on how much has been drawn, the rate at that point, and the length of the remaining repayment period. A broker can model the exact transition for your facility size and draw pattern before you commit.

The provider assesses affordability at the repayment-period payment level before the facility is set up, so the borrower must be able to afford the higher post-transition payment from the outset. Borrowers should plan and budget for this increase rather than treating the lower draw-period payment as the long-term cost. The repayment calculator lets you model draw-period and repayment-period payments for any amount. The guide to HELOC risks explained covers this transition in detail.

The maximum facility depends on the equity in the property. Providers calculate the combined LTV (your existing mortgage balance plus the full HELOC facility limit) and typically cap at 85% of the property value. For example, on a property worth £350,000 with a £180,000 mortgage, the maximum HELOC facility at 85% combined LTV would be approximately £117,500. All figures are illustrative and actual limits depend on the provider and individual circumstances.

The LTV-based figure is a ceiling, not a guarantee. Affordability sets the practical limit. The affordability assessment is based on the full facility amount, amortised over the repayment period only (excluding the draw period), and stress-tested at a rate above the offered rate. For many borrowers, affordability rather than LTV is the binding constraint.

UK HELOC facility limits typically range from £5,000 to £500,000 at the time of writing, though the actual range available to any individual borrower depends on the property value, the existing mortgage, and the affordability assessment. The equity available calculator shows the available amount at five LTV tiers for any property value and mortgage balance.

UK HELOC products typically involve three fee categories: a lender product fee calculated as a percentage of the facility amount and subject to a cap, a lender arrangement fee also calculated as a percentage of the facility and capped separately, and a broker fee charged as a percentage of the facility amount by the arranging broker. Valuation and legal fees also apply. Fee structures and levels vary between providers and brokers, so confirming the exact position before proceeding is important.

HELOC fees are generally higher than standard secured loan fees. This is one of the most important factors in the cost comparison between the two product types. The interest saving from gradual draws can be significant, but it needs to be weighed against the higher upfront fees. On smaller facility amounts, the fees can represent a larger proportion of the total borrowing and may erode or exceed the draw-timing saving entirely.

Fees can typically be paid upfront or added to the facility balance. Adding fees to the balance means paying interest on the fee amount over the remaining term, which increases the total cost of the borrowing. Paying upfront, where possible, avoids that compounding cost. The guide to HELOC fees and costs itemises every fee category and includes worked examples showing the impact of adding fees to the balance versus paying upfront.

It depends on the nature and recency of the adverse markers. The UK HELOC market is smaller than the standard secured loan market, which means there are fewer providers and less variation in credit criteria. Some providers will consider applications with historic missed payments or settled defaults where the overall position is otherwise strong, but recent severe adverse credit, including unsatisfied CCJs, active IVAs, or bankruptcy, significantly narrows the options.

Credit profile is only one part of the assessment. The combined LTV, the property type, the income position, and the purpose of the borrowing all factor into the decision. A borrower with a settled default from three years ago but a strong income and low LTV may still be eligible, while a borrower with a clean credit file but marginal affordability could be declined. Each case is assessed individually.

For borrowers with adverse credit, the wider secured loan market typically offers more product choice because there are more lenders with varying credit appetites. A broker who works across both HELOC and standard secured products can assess which route is more likely to produce a viable offer before any application is submitted. The guide to HELOC with bad credit covers the eligibility picture in detail.

When the draw period ends, the facility closes to new draws and the outstanding balance automatically converts to capital-plus-interest repayments over the remaining term. Monthly payments will increase at this point because the borrower is now repaying capital as well as interest. The size of the increase depends on how much has been drawn, the rate at that point, and the remaining repayment term. A broker can model this transition for your specific scenario before you commit, and the repayment calculator lets you estimate the figures for any facility size and draw pattern.

At this point, the borrower has several options. They can continue with the existing facility on the new repayment terms, repay the balance in full or in part at any time, or refinance onto a different product. There are no early repayment charges on HELOC products currently available in the UK at the time of writing, so there is no financial penalty for repaying ahead of schedule or switching to an alternative product.

If the borrower wants to extend the draw period or take out a new facility, this would require a new application and a fresh affordability assessment. The existing facility cannot simply be extended without a formal reassessment. The guide to refinancing a HELOC covers the options available when the draw period ends or when circumstances change during the term.

It depends on the existing mortgage position. If the borrower has a favourable fixed-rate mortgage secured before rates rose, remortgaging to release equity means giving up that rate. The hidden cost of moving the existing balance to a higher rate can exceed the savings from the lower remortgage rate on the new borrowing. In that scenario, a HELOC sits alongside the existing mortgage as a second charge, leaving the existing rate entirely untouched.

If the existing mortgage deal is ending, is already on a variable rate, or is no longer competitive, a remortgage typically offers the lowest overall rate because it is a first-charge product. In that scenario, there is nothing to protect, and replacing the existing deal with a better one while releasing additional funds in the same transaction usually makes more financial sense than taking out a separate HELOC alongside a less competitive mortgage.

The comparison is not just about the rate on the new borrowing. It requires modelling the total cost across the entire debt position: the existing mortgage balance at its current rate, the new borrowing at the HELOC or remortgage rate, and the fees on both sides. A broker can run this comparison before any application is submitted. The guide to HELOC vs remortgage works through both scenarios in detail.

Most UK HELOCs carry variable rates, typically linked to the Bank of England base rate or a similar reference rate, plus a lender margin. The margin is set at the outset based on the combined LTV and the borrower's credit profile. When the reference rate changes, the HELOC rate changes by the same amount and the monthly payment adjusts accordingly. This means the borrower's payment can go up or down over the term.

Some providers offer the option to fix portions of the drawn balance for a defined period, typically two or five years. This provides a degree of payment certainty on part of the borrowing while keeping the remainder variable. The fixed portion cannot be redrawn until the fixed period ends, so fixing reduces the revolving flexibility of the facility. Whether fixing is worthwhile depends on the borrower's tolerance for payment variability and their view on the direction of rates.

Variable rates introduce budgeting uncertainty that borrowers should stress-test before committing. The repayment calculator lets you model the impact of rate changes on both draw-period and repayment-period payments for your own facility size. The guide to fixed vs variable rate HELOC covers the trade-offs and includes scenario comparisons.