Buy-to-Let Mortgages for HNW and International Landlords

Buy to Let Mortgages

Buy-to-let mortgage lending is broadly straightforward when the borrower has a simple income, a standard property, and a straightforward ownership structure. The market for that transaction is crowded, competitive and well-served by comparison sites.

When those elements become complex — an offshore company, a prime London property, a portfolio structured across multiple SPVs, income denominated in USD or AED — the standard lender panel falls away rapidly. That is the market Platinum Global Bridging Finance serves, and where our lender access and structuring experience are genuinely valuable.

We arrange buy-to-let mortgages from £500,000 across the full specialist BTL and private bank panel, for UK residents, foreign nationals, non-domiciled individuals and offshore entities.

Buy-to-Let Mortgages: At a Glance

Why Standard BTL Lenders Decline Complex Cases

The mainstream buy-to-let panel is designed for straightforward applications. When a case deviates — offshore income, BVI-held property, non-UK credit file, loan size above a lender’s single-asset cap, Prime Central London valuations outside standard criteria — most lenders simply decline rather than engage with the complexity.

The reasons are consistent. Offshore corporate borrowers require legal structures the lender’s conveyancers may not handle. Non-UK income involves currency risk and verification the underwriting system cannot accommodate. PCL properties frequently exceed individual lender exposure limits. Large loans on single assets fall outside the standard BTL model and require private bank or specialist debt fund capacity.

A broker who accesses 100+ lenders — including specialist lenders, private banks, family offices and debt funds — can match a complex profile to a lender whose appetite matches the case. That is materially different from a comparison site presenting a rate table.

Six Routes We Arrange

1. Standard Residential BTL

Single residential properties let on assured shorthold tenancies, assessed on rental income and borrower profile. Available in personal name or limited company SPV. Most lenders want rental income to cover 125–145% of monthly interest at a stressed rate. We access the full residential BTL panel including lenders who do not accept direct applications.

2. HMO Mortgages

Houses in multiple occupation — from 3-bedroom standard HMOs to large licensed HMOs with 7 or more beds. All specialist HMO lenders are broker-only; there is no route to this market without a specialist intermediary. Licensing status, landlord experience and Article 4 planning position all affect lender appetite and terms. Our HMO Finance page covers this in detail.

3. Multi-Unit Freehold Blocks

Freehold blocks of 2 to 20+ self-contained flats valued as a single asset rather than individually. Loan-to-value is assessed against block value, and lenders vary in whether they use aggregate-of-units or block methodology. See our dedicated MUFB page for criteria and lender detail.

4. Holiday Let and Short-Term Let

Seasonal and year-round short-let properties assessed on projected income rather than a tenancy. Mainstream BTL lenders do not lend on short-let property — a specialist holiday let or commercial mortgage is the correct structure. Terms depend on income evidence, location and operating model.

5. Portfolio Finance

From the four-property PRA portfolio landlord threshold, lender underwriting shifts from single-property to portfolio-wide assessment. PRA rules require a portfolio stress test, business plan, cash flow projections and concentration checks on every new application once you hold four or more mortgaged BTL properties. For larger portfolios, single-lender portfolio facilities — operating as a credit line against the whole portfolio rather than property-by-property — are often the most efficient structure. See our Portfolio Mortgage Loans page for how these are structured.

6. Offshore, Foreign National and Non-Dom BTL

This is the route the mainstream market cannot serve, and where our experience is most distinctive. We arrange buy-to-let mortgages for:

• Offshore corporate borrowers — BVI, Cayman Islands, Isle of Man, Gibraltar and Channel Islands structures, where the lender must be experienced in lending against UK property held by an offshore entity
• Foreign nationals — non-UK citizens purchasing UK rental property, assessed on source of funds, deposit size and income stability rather than UK credit file alone
• Non-domiciled residents — clients restructuring their UK property holdings following changes to non-dom taxation, or arranging new acquisitions within a revised framework
• UK expats — British nationals living overseas purchasing UK investment property. Our Expat Mortgages page covers this in more depth
• Multi-currency income — clients whose income is denominated in USD, EUR, HKD, AED or other currencies, where lenders must assess FX-denominated earnings in context

Prime Central London BTL

The Prime Central London market — Mayfair, Knightsbridge, Belgravia, Chelsea, Kensington — operates at a scale and complexity that places it outside standard BTL criteria on multiple dimensions simultaneously.

Individual property values regularly exceed £2m on a single flat and reach £15m+ on houses. Most BTL lenders impose single-asset exposure caps well below this. Properties in PCL are frequently held through offshore corporate structures, held by non-domiciled owners, or purchased by foreign national investors with non-UK income — each of which eliminates most of the standard BTL panel.

We access private bank and specialist debt fund capacity for PCL buy-to-let lending, where the underwriting assesses the quality of the borrower’s overall balance sheet and the asset’s covenant rather than applying a standard rental coverage ratio. For PCL property requiring bridging finance before refinancing onto a BTL mortgage, our London bridging finance page covers the initial acquisition stage.

Ownership Structure: Personal Name, SPV or Offshore

The ownership structure decision affects which lenders are available, what rate applies, and the long-term tax position. We arrange lending under all three routes:

Personal name — simplest structure for basic rate taxpayers acquiring a single BTL. Tax relief on mortgage interest is limited to a 20% credit under Section 24.

UK limited company SPV — the standard structure for higher and additional rate taxpayers building a portfolio. Companies deduct mortgage interest in full as a business expense. Most specialist BTL lenders now have dedicated SPV products. Day-one SPV applications are accepted by the major specialist panel.

Offshore entity — for non-domiciled or overseas investors for whom UK personal ownership raises inheritance tax or other considerations. Lenders who accept offshore corporate borrowers are a small subset of the market, require enhanced due diligence, and typically want existing relationships with UK-experienced solicitors.

Tax structuring decisions sit with your accountant and tax adviser. We arrange the lending once the holding structure is confirmed.

From Bridging to BTL: The Bridge-to-Let Route

Many buy-to-let acquisitions do not start as mortgageable property. A property purchased at auction in poor condition, a commercial property being converted to residential, or an HMO conversion from a standard house all require short-term finance first, with the BTL mortgage as the exit.

We arrange both stages, which matters more than it sounds. A bridge arranged with the specific BTL exit in mind — right lender, right structure, achievable valuation at the end — progresses far more smoothly than two separate processes arranged independently. Our bridge-to-let finance page covers this combined structure.

Frequently Asked Questions

What deposit do I need for a buy-to-let mortgage?

The standard minimum deposit on a residential BTL mortgage is 25% (75% maximum LTV). For limited company SPV applications, most lenders want 25–30%. For HMO and MUFB, typically 25–30%. For larger portfolio facilities, loan-to-value typically caps at 65–70% of aggregate portfolio value. Higher LTVs — up to 80% in some cases — are available through specialist lenders, usually requiring a strong rental yield and clean credit profile.

Can I get a BTL mortgage through an offshore company?

Yes, through a specialist subset of the lender panel that is experienced in offshore corporate borrowers. The legal process is more involved — UK-qualified solicitors must handle the security documentation, and enhanced due diligence on source of funds and ultimate beneficial ownership is standard. Expect a higher rate than on equivalent personal name or UK SPV applications, reflecting the additional complexity.

Can a foreign national get a BTL mortgage in the UK?

Yes. Lenders who accept foreign national applications assess the application on deposit size, income stability, source of funds and the UK property as security, rather than requiring a UK credit file. Deposit requirements are typically 35–40%. The field of available lenders is narrower than for UK residents, and a specialist broker is essential for access to the full market.

What is the PRA portfolio landlord rule?

From your fourth mortgaged BTL property, lender underwriting shifts from single-property to portfolio-wide assessment under PRA rules introduced in 2017. Lenders apply a portfolio stress test, require a business plan and cash flow projection, and check concentration by property type and geography. This affects every new application from the fourth property onwards, regardless of how strong the new property looks individually.

How does Section 24 affect BTL mortgage structuring?

Section 24, fully in force since 2020, restricts mortgage interest relief for individual landlords to a 20% basic rate tax credit, regardless of the individual’s marginal tax rate. Higher and additional rate taxpayers holding BTL property in personal name face a significantly increased tax burden compared with pre-2020. Limited company ownership allows mortgage interest to be deducted in full as a business expense, which is why SPV structures are now the default for portfolio landlords. Individual tax advice should be taken from an accountant.

How long does a BTL mortgage take to arrange?

Three to six weeks for standard residential BTL on the mainstream panel. Five to eight weeks for specialist cases including HMO and large MUFB. Six to twelve weeks for offshore corporate borrowers and portfolio-wide facilities. Legal completion adds a further three to six weeks in most cases.

Do you charge a broker fee on BTL mortgages?

We do not charge a broker fee on qualifying buy-to-let mortgage loans above £500,000. Our remuneration comes from the lender. This means our service is cost-neutral to you compared with approaching lenders directly — while giving access to the full specialist and private bank panel that is not available direct.

Related Finance

• Portfolio Mortgage Loans — multi-property portfolio facilities and PRA landlord lending
• HMO Finance — specialist mortgages and bridging for Houses in Multiple Occupation
• MUFB Mortgages — freehold block finance for 2–20+ unit buildings
• Bridge-to-Let Finance — combined bridging and BTL mortgage for refurbishment and conversion projects
• Expat Mortgages — UK property mortgages for British nationals living overseas
• London Bridging Finance — short-term acquisition finance for Prime Central London property