Semi-Commercial and Mixed-Use Finance
Semi-Commercial Mortgage UK
Semi-commercial property, buildings combining both commercial and residential elements, sits between mainstream residential and pure commercial lending. A shop with a flat above, an office converted to include apartments, a pub with letting rooms: each presents a blended risk profile that high-street lenders often decline and specialist lenders actively seek. Platinum Global Bridging Finance arranges semi-commercial mortgages and mixed-use finance from £250,000 to £150m+ across the UK, through a panel of over 100 lenders. No broker fee on facilities of £500,000 or above.
What Is Semi-Commercial Property?
A semi-commercial or mixed-use property is one that contains both commercial and residential accommodation within the same title. The most common examples are:
- Ground-floor retail or commercial unit with residential flats above
- Office building with converted residential upper floors
- Pub or licensed premises with letting rooms or owner’s accommodation
- Light industrial unit with a manager’s flat attached
- GP surgery or professional premises with residential accommodation
- Live-work units and B&Bs with owner’s accommodation attached to a trading business
The proportion of residential versus commercial use determines how the loan is regulated and which lenders will consider it. Where the residential element represents more than 40% of the property’s floor area or rental value, and the borrower or a connected person intends to occupy that residential element as a main residence, the loan is treated as regulated under FCA rules, and the lender pool shifts toward those authorised for consumer credit. Below that threshold, or where the residential element is let out rather than owner-occupied, the loan is assessed commercially and remains unregulated. Allica Bank defines their semi-commercial eligibility as the residential element occupying between 50% and 80% of total floor space for regulated products; below 50% residential, most specialist lenders treat the asset as a commercial property and assess accordingly. Because each lender sets its own threshold, and because some measure the split by floor area while others measure by value, a deal that falls outside one lender’s criteria can sit comfortably within another’s, which is precisely where broker experience of the market earns its keep.
Why Investors Choose Semi-Commercial Property
Beyond the blended income appeal, semi-commercial property carries a structural advantage that pure residential buy-to-let does not: it is exempt from the additional 5% stamp duty land tax surcharge that applies to residential investment purchases in England and Northern Ireland, because the property is classified as mixed-use rather than wholly residential. On a £650,000 purchase, that exemption alone is worth £32,500 compared with an equivalent fully residential buy-to-let purchase. Semi-commercial assets have also historically produced stronger blended yields than standard residential buy-to-let, with industry yield surveys putting typical mixed-use yields meaningfully above vanilla residential buy-to-let yields in the same period, reflecting the additional income generated by the commercial element relative to the capital value.
How Semi-Commercial Mortgages Are Assessed
The blended nature of the property means lenders must assess two income streams simultaneously, commercial rent from the ground floor or commercial element, and residential rent or value from the residential units. Assessment approaches vary by lender:
Rental Income Approach
Many specialist lenders assess the total rental income from both the commercial and residential elements, applying a combined DSCR test, typically requiring total income to cover the interest payment by 125% to 145%. This approach favours fully let properties with established rental income from both elements. The commercial rent and residential rent are given equal weight in most lenders’ income calculations, though some discount the commercial element by 10% to 20% to reflect the higher void risk of commercial units versus residential, and limited company borrowers typically face a slightly lower coverage requirement than individual taxpayers due to full mortgage interest deductibility.
Blended Valuation Approach
The property is valued as a single mixed-use asset, with the LTV calculated against the combined valuation. This is straightforward where the property is sold as a single lot but can be more complex where the commercial and residential elements have separate titles. Residential space within the property is typically valued using the comparable method, referencing similar flats or houses in the immediate area, while the commercial space is valued using the investment method, based on the rental income it generates and the appropriate yield for that property type and location. The surveyor must be experienced in both approaches to produce a reliable blended figure; an inexperienced valuer can materially undervalue a mixed-use asset by failing to correctly weight the two income streams.
Separate Assessment
Some lenders assess the commercial and residential elements separately, applying commercial lending criteria to the shop or office and buy-to-let criteria to the residential flats. This approach can produce higher overall LTVs but requires more detailed underwriting and can limit the lender pool. It is most commonly used where the commercial and residential elements have been separately titled and where both elements have independent, established income streams.
How the Residential/Commercial Split Is Measured
The single variable that most investors underestimate when approaching semi-commercial finance is how the split between residential and commercial use is actually measured, because two different methods can produce very different answers on the same building. Most lenders measure by floor area, comparing the square footage given over to residential accommodation against the square footage of the commercial unit. A minority measure by capital value or rental value instead, which can move the classification significantly where the commercial ground floor commands high rent relative to its footprint. A shop with a large flat above might be 65% residential by floor area but only 50% residential by value if the retail unit generates strong rental income relative to its size. It is worth confirming with your broker which method your target lender applies before an application is submitted, because the classification determines both the lender pool available and, in owner-occupied cases, whether the loan falls under regulated mortgage rules.
Where access between the commercial and residential elements is entirely separate, a shop with its own street frontage and a self-contained flat with independent rear access, some lenders will consider splitting the security into two facilities: a standard commercial mortgage on the shop and a buy-to-let mortgage on the flat. This can widen the lender pool and, in some cases, improve overall LTV, but building fabric shared between the two units, a single roof, shared drainage, party walls, can complicate a clean split and cause some lenders to insist on treating the property as a single mixed-use security regardless.
Lending Criteria for Semi-Commercial Finance
| Parameter | Typical Range |
|---|---|
| Loan size | £250,000 to £150m+ |
| LTV | Up to 75% |
| Term | 3 to 25 years |
| Rate (2026) | 5.5% to 8.5% pa |
| Repayment basis | Interest-only or capital and interest |
| Regulated vs unregulated | Depends on residential % and occupation status |
| Borrower types | Individual, Ltd company, LLP, SPV, trust |
Rates for semi-commercial mortgages in 2026 typically range from 5.5% to 8.5% per annum, generally sitting below equivalent pure commercial mortgage rates because lenders view the diversified income across two asset classes as a risk mitigant, but above standard residential buy-to-let rates because of the added underwriting complexity. The rate is driven primarily by the LTV, the quality of income from both elements, the strength of tenants, and the lender’s assessment of the regulated vs unregulated boundary. Properties where the commercial element is vacant or on a short lease attract higher rates than those with fully established, long-leased income across both components. Fixed rate products are available from specialist lenders for terms of 2 to 10 years; most high-street lenders offer variable rate semi-commercial products only.
Owner-Occupied vs Investment Semi-Commercial
Semi-commercial properties can be financed on either an owner-occupied or investment basis, depending on who occupies the commercial element. Where the borrower’s own business trades from the ground floor and the residential flats are let, a hybrid assessment is typical: the commercial element assessed on trading income using a debt service coverage test similar to a standard owner-occupied commercial mortgage, the residential element on rental yield. Where the entire property is let to third parties, the loan is assessed purely on rental income across both elements, in the same way as a commercial investment mortgage.
First-Time Semi-Commercial Investors
Semi-commercial property is often a natural next step for residential buy-to-let landlords wanting to diversify into commercial income without taking on a fully commercial asset. Lender appetite for first-time semi-commercial investors has genuinely improved in recent years, though the strongest rates are still reserved for those with at least a year of experience letting commercial property, or two years of standard buy-to-let experience. A larger deposit, typically 30% or more, and a fully let property at the point of application both materially widen the panel of lenders willing to consider a first-time applicant.
Semi-Commercial Bridging Loans
Where a mixed-use property is purchased at auction, requires refurbishment before it can be let, or needs to complete quickly before long-term finance is arranged, a bridging loan is the typical short-term solution. We arrange semi-commercial bridging loans for purchases, refurbishments, and refinances, with a clear exit to a long-term semi-commercial mortgage once the property is stabilised. A commercial auction bridging loan can complete in 3 to 10 working days where required. Bridge-to-mortgage transactions are particularly common on semi-commercial assets where the commercial unit requires refurbishment or a new tenant before mainstream lenders will engage.
Challenges with Semi-Commercial Lending
The mixed-use nature of these properties creates specific challenges that make specialist broker involvement important:
- Smaller lender pool: Many mainstream lenders decline semi-commercial entirely. The right specialist lender must be identified from the outset. Together Money, InterBay, and Shawbrook are among those with genuine appetite for well-structured semi-commercial cases.
- Valuation complexity: Mixed-use valuations require a surveyor experienced in both commercial and residential property markets. An inexperienced valuer may undervalue the asset or fail to correctly weight the income streams.
- Regulated vs unregulated boundary: Getting the residential percentage assessment wrong, or misunderstanding whether it is measured by floor area or value, can result in the wrong lender type being approached, delaying the transaction and potentially requiring a restart with a different lender.
- Lease complexity: Multiple tenancies, mixed lease types, and commercial break clauses all require careful review at the term sheet stage.
- EPC requirements: Both the commercial and residential elements may have different EPC requirements and trajectories, which lenders are increasingly factoring into their underwriting.
- Access and services: Where the commercial and residential elements share a roof, structure, or services but have separate access, some lenders prefer to split the security into two facilities rather than lend against the combined title.
Semi-Commercial Remortgages
Remortgaging a semi-commercial property to release equity, move to a better rate, or restructure ownership is straightforward where the property has an established income record from both elements. We arrange semi-commercial remortgages for investors looking to pull equity from mixed-use assets, restructure from a personal to a company name, or move from a high-street variable rate to a fixed rate specialist product. No broker fee on remortgages of £500,000 or above.
Worked Example: Shop with Flats Above
An investor purchases a mixed-use building comprising a ground-floor retail unit let on a 5-year lease at £18,000 per annum, and two residential flats above let at £950 per month each (£22,800 per annum combined). Purchase price: £650,000.
- Total annual rent: £18,000 + £22,800 = £40,800
- LTV: 70% = Loan of £455,000
- Rate: 6.5% pa interest only
- Annual interest: £29,575
- DSCR: £40,800 / £29,575 = 1.38x (above the 1.25x minimum)
- Arrangement fee: 1.5% = £6,825
- Deposit required: £195,000
- SDLT saving versus a fully residential purchase: approximately £32,500
No broker fee applies. The strong blended DSCR and established rental income across both elements support a competitive rate from a specialist mixed-use lender such as Together Money or InterBay.
Worked Example: Owner-Occupied Ground Floor, Residential Flats Above
A solicitors’ practice purchases a Victorian townhouse converted to a ground-floor office (used by the firm) with three residential flats above, let at £900 per month each. Purchase price: £1,100,000.
- Purchase price: £1,100,000
- LTV: 65% = Loan of £715,000
- Rate: 6.75% pa interest only
- Annual interest: £48,262
- Residential rental income: £32,400 pa
- Hybrid assessment: commercial element on firm’s trading income (£280,000 adjusted net profit); residential on yield
- Combined income comfortably exceeds DSCR requirements
- Deposit required: £385,000
No broker fee applies on this facility as it exceeds £500,000.
Worked Example: Pub with Letting Rooms
An operator purchases a village pub with 4 letting rooms and owner’s accommodation for £780,000, with the trading business generating £95,000 adjusted net profit annually.
- Purchase price: £780,000
- LTV: 65% = Loan of £507,000
- Rate: 7.0% pa interest only
- Annual interest: £35,490
- DSCR based on trading profit: £95,000 / £35,490 = 2.68x
- Deposit required: £273,000
No broker fee applies. The trading business, letting rooms, and owner’s accommodation are assessed together under a semi-commercial owner-occupied structure with a specialist hospitality-experienced lender.
Frequently Asked Questions
Is a semi-commercial mortgage regulated or unregulated?
It depends on the proportion of residential use and whether the borrower will occupy that residential element as a main residence. Where the residential element is more than 40% of the property by floor area or rental value and is owner-occupied, the loan is regulated. Otherwise it is assessed commercially and is unregulated.
Can I get a semi-commercial mortgage if the commercial unit is vacant?
A vacant commercial unit makes the application harder but not impossible. Some lenders will assess on the market rental value of the vacant commercial space alongside the established residential income. A bridging loan is often more appropriate where the commercial element needs refurbishment or a new tenant before mainstream lenders will consider the property.
What LTV is available for semi-commercial properties?
Most specialist lenders offer up to 70% to 75% LTV for semi-commercial assets with established rental income across both elements. Vacant or partially let properties typically attract lower LTVs.
Does a semi-commercial purchase avoid the residential stamp duty surcharge?
Yes, because the property is classified as mixed-use rather than wholly residential, it is not subject to the additional 5% SDLT surcharge that applies to residential investment purchases, which is a significant saving on larger transactions.
Can I refinance a semi-commercial property I already own?
Yes, semi-commercial remortgages are common, often to release equity, move to a better rate, or restructure ownership. We arrange refinances as well as purchases.
How is the residential/commercial split measured?
Most lenders measure by floor area, though some use capital or rental value instead, which can produce a different classification for the same property. Confirming the method your target lender applies before applying avoids delays caused by approaching the wrong type of lender.
Can I use a limited company to buy a semi-commercial property?
Yes, limited companies and SPVs are commonly used to hold semi-commercial property, and can benefit from full mortgage interest deductibility, which is a meaningful advantage over personal ownership for higher-rate taxpayers.
Does Platinum Global charge a broker fee?
No broker fee on facilities of £500,000 or above.