How to Remortgage a Buy-to-Let: Timing, Costs, and Strategy
2026-07-27
Every fixed-rate mortgage ends. When it does, you have a decision: let it roll onto the lender's Standard Variable Rate (usually 2-3% above your fixed rate), or remortgage to a new product. For BTL investors, this decision comes around every 2-5 years per property — and getting it right is worth thousands annually across a portfolio.
When to Remortgage
The Standard Trigger: Product Expiry
Your fixed rate (2 or 5 year) expires on a specific date. After that, you move to SVR — typically 7-8% in 2026. On a £150,000 mortgage, that's an extra £250-£375/month compared to a 5% fix.
Timeline: Start the remortgage process 3-4 months before your product expires. Most mortgage offers are valid for 6 months, so you can lock in a rate early without committing until completion.
Early Remortgage (Before Product Expiry)
You might want to exit early if:
- Rates have dropped significantly since you fixed (savings outweigh the ERC)
- You need to release equity for a new purchase
- Your circumstances have changed (moving to a company structure)
But: Early Repayment Charges (ERCs) apply. Typically 3-5% in year 1, reducing by 1% each year. On a £150,000 mortgage, a 3% ERC is £4,500. Calculate whether the rate saving over the remaining term exceeds the ERC cost.
Remortgage to Release Equity
If your property has increased in value since purchase, remortgaging at the current (higher) value lets you borrow more and withdraw cash:
Example:
- Original purchase: £180,000, mortgage: £135,000 (75% LTV)
- Current value: £220,000
- New mortgage at 75% LTV: £165,000
- Cash released: £165,000 - £135,000 = £30,000
This £30,000 is tax-free (it's borrowed money, not income) and can fund your next deposit. This is how portfolio builders recycle equity without selling properties.
[!tip] Equity release is the portfolio builder's secret weapon You don't need to sell a property to access its growth. Remortgage at the higher value, pull cash out, and use it as the deposit on your next purchase. The original property stays in your portfolio, still renting, still growing.
The Costs of Remortgaging
| Cost | Typical Amount | Notes |
|---|---|---|
| Arrangement fee | £0-£2,000 | Some products are fee-free |
| Valuation fee | £0-£500 | Often free with the product |
| Legal fees | £0-£500 | Many lenders offer free legals on remortgage |
| Broker fee | £300-£500 | If using a broker |
| ERC (if leaving early) | 1-5% of balance | Only if breaking a fixed rate |
| Total (standard remortgage) | £0-£1,500 | Excluding ERC |
Many BTL remortgage products offer free valuation, free legals, and no arrangement fee — making the switch effectively cost-free. Your broker will identify these.
The Remortgage Decision Framework
Should I Remortgage or Stay on SVR?
Always remortgage. SVR is almost never the right choice for a BTL investor. The rate is too high, and switching to a new product is usually free or near-free.
The only exception: if you're planning to sell within 3-6 months, taking a new fixed product with an ERC doesn't make sense. Stay on SVR for the short period before sale.
2-Year Fix vs 5-Year Fix?
| 2-Year Fix | 5-Year Fix | |
|---|---|---|
| Rate | Usually 0.1-0.3% lower | Slightly higher |
| Flexibility | Remortgage sooner (rate may drop) | Locked in longer |
| Fees | Pay arrangement fee twice in 5 years | Pay once in 5 years |
| Best when | You expect rates to fall soon | You want certainty or rates might rise |
In 2026, with rates potentially stable or slightly declining, both options are defensible. If you believe rates are heading down, a 2-year fix lets you remortgage sooner at a better rate. If you want certainty, a 5-year fix locks in and you don't think about it.
Same Lender (Product Transfer) vs New Lender?
Product transfer: Switch to a new product with your existing lender. Usually no valuation, no legal work, faster process. But the rates offered may not be the best available.
New lender: Full remortgage application with a different lender. Requires valuation, legal work, and affordability assessment. But you access the whole market and may find significantly better rates.
Rule of thumb: Always check what your existing lender offers (product transfer), then compare against the wider market. If the market is 0.3%+ cheaper, switch lenders. If it's similar, take the product transfer for simplicity.
Remortgage Affordability in 2026
BTL remortgage affordability works the same as a new purchase:
- Rent must cover 125-145% of mortgage interest at the stressed rate
- Personal income minimum applies (typically £25,000+)
- Portfolio landlords (4+ properties) face whole-portfolio assessment
Watch out for: Properties where rent hasn't kept pace with value growth. If you bought at £150,000 (rent £800) and the property is now worth £220,000, the new mortgage amount at 75% LTV (£165,000) may not pass affordability if rent is still only £850.
Solution: Increase the rent to market level before remortgaging. Many landlords let rents fall behind — the remortgage is a forcing function to address this.
:::tool remortgage-calculator Check Your Remortgage Options :::
Timing the Market
The temptation to "wait for rates to drop" is strong. The reality:
- Nobody accurately predicts rate movements consistently
- The cost of staying on SVR while waiting is real and immediate (£200-£400/month extra)
- If rates don't drop, you've lost money waiting
- If rates do drop, you can remortgage again in 2 years
The practical approach: Fix now at the best available rate. If rates drop significantly within your term, calculate whether the ERC cost is worth breaking for the new rate. Usually it isn't until rates drop 1%+ below your current fix.
Remortgaging for Portfolio Strategy
Consolidation
If you own multiple properties with mortgages at different lenders, some investors remortgage all properties to one lender for simpler management. Portfolio landlord products allow this — but check you're not sacrificing rate for convenience.
Moving to a Company
If you want to transfer a property from personal name to a limited company, you can't simply "remortgage into the company." The property must be sold to the company — triggering SDLT and potentially CGT. This is expensive and complex. See Ltd Company vs Personal Name for when this makes sense.
Capital Repayment Switch
Remortgage time is when many investors switch from interest-only to repayment on some properties. If rents have grown enough to absorb the higher payments, this starts building equity and moves the portfolio towards the mortgage-free income that retires you. See Interest-Only vs Repayment.
The Remortgage Checklist
3-4 months before product expiry:
- Check current property value (online estimates + agent opinion)
- Confirm current rent is at market level (increase if behind)
- Gather documents: rental income evidence, tax returns, mortgage statement
- Get existing lender's product transfer rates
- Get broker to search the wider market
- Compare total cost (rate + fees) over the new product term
- Decide: product transfer or switch lender
- Apply 8-12 weeks before expiry to allow time for valuation and legal work
The Remortgage Calculator
The Remortgage Calculator compares your current deal against new products, showing monthly savings, total cost over the term, and break-even analysis on arrangement fees. It answers the core question: is switching worth it?
:::tool remortgage-calculator Compare Your Remortgage Options :::
Summary
- Never stay on SVR — always remortgage (unless selling imminently)
- Start the process 3-4 months before product expiry
- Equity release on remortgage is the primary tool for funding next purchases
- Compare product transfer (same lender, easy) vs full remortgage (better rate, more work)
- Bring rents to market level before remortgaging — it helps affordability
- 2-year fix if you think rates will fall; 5-year fix if you want certainty
- Use remortgage as a strategic moment: switch to repayment, release equity, or consolidate
This guide is for educational purposes only. Always consult a qualified mortgage broker for advice specific to your circumstances.