Broker vs Bank for Buy-to-Let Remortgages

Why BTL Is a Broker Market

Since the 2016 PRA changes and the phasing-out of Section 24 tax relief for individual landlords, the UK buy-to-let mortgage market has bifurcated. High-street banks retreated from BTL to focus on residential, while specialist lenders — Paragon, The Mortgage Works, BM Solutions, Landbay, Fleet, Kent Reliance, Foundation, Precise, and many others — expanded.

These specialist lenders designed products for the way modern landlords actually operate: SPV limited companies, HMOs, multi-unit freeholds, semi-commercial properties, expat landlords, portfolio landlords with 4+ properties. Your high-street bank offers almost none of these structures well. If they offer BTL at all, it is typically only for simple, low-LTV, single-let properties owned personally.

This is why BTL in 2026 is overwhelmingly a broker-placed market. Going direct to your bank for a BTL remortgage limits you to a narrow slice of the market, often at rates 0.5%–1.5% higher than the broker-sourced specialist equivalent.

Limited Company BTL — Where Banks Cannot Compete

Most landlords in 2026 incorporate their rental property into an SPV limited company (usually a newco with a SIC code of 68209 or 68100) because it preserves mortgage interest relief that Section 24 stripped from individual landlords. Your high-street bank's BTL range typically only accepts personal name applications.

Specialist limited company BTL lenders include Paragon, Kent Reliance, Fleet, Foundation, Landbay, Precise, Keystone, Vida, and many others. Each has its own rules on SIC codes, director guarantees, personal income requirements, and trading history for the SPV.

A broker knows which lender accepts which SPV structure. Kent Reliance will lend to a newco SPV on day one with personal affordability. Paragon wants the SPV to be established with accounts. Landbay focuses on professional landlords only. This is not public information easily comparable on a rate table — it is specialist broker knowledge.

HMOs, MUFBs, and Non-Standard Properties

If your BTL is an HMO (House in Multiple Occupation), MUFB (Multi-Unit Freehold Block), holiday let, student HMO, or has any non-standard feature (above commercial, flat roof, ex-local authority concrete), your high-street bank almost certainly does not lend. Specialist lenders — Paragon, Kent Reliance, Fleet, Foundation — handle these cases as core business.

HMO rates are typically 0.3%–0.6% above standard BTL because of the slightly higher perceived risk. MUFB rates sit similar. But relative to the bank's response (which is 'we do not lend on that'), any specialist rate is infinitely cheaper than the alternative of no remortgage at all. A broker is essentially mandatory for these property types.

Portfolio Landlords and Top-Slicing

Under PRA rules, anyone with 4+ mortgaged BTLs is classified as a portfolio landlord, triggering extra scrutiny on all lending. Each new application requires the lender to stress-test the whole portfolio — not just the individual property — against ICR (Interest Coverage Ratio) requirements.

Specialist lenders with portfolio propositions — Paragon, BM Solutions, Landbay — have streamlined processes for this. They will accept a portfolio schedule, stress-test against their ICR (typically 145% at 5.5%), and approve on that basis. High-street banks either do not offer portfolio BTL at all, or make the process extremely slow.

"Top-slicing" is another specialist feature: where rental income alone does not meet ICR, some lenders will allow surplus personal income to top up the affordability calculation. This unlocks higher borrowing on lower-yielding properties and is common in London/South East. Your bank will not offer this. A broker will match you to the lender whose top-slicing rules fit your profile.

Rates and Fees: The BTL Specific Picture

BTL rates in 2026 are typically 0.5%–1.2% higher than equivalent residential rates due to PRA stress requirements and the product-fee structure most BTL lenders use. Specialist BTL lenders often charge higher product fees (1%–5% of loan) in exchange for lower headline rates. Personal-name BTL tends to have lower fees; SPV BTL tends to have higher fees.

A broker's job on BTL is not just finding the lowest rate — it is modelling the total 5-year cost including fees, ICR treatment, revert rate, and exit options. A headline-rate comparison for BTL is almost always misleading. Your bank will only show you its own product with its own fee structure and no optimisation.