Semi-Commercial Development Finance in 2026: Building Mixed-Use From the Ground Up

A decision notice arrives in the last week of August: full planning consent for one ground-floor retail unit and six flats on the site of a closed car showroom at the edge of a Midlands market town. The developer has owned the site for two years, has a fixed-price build contract from a local contractor, and has a cost plan that says 1.5 million pounds all in. What the developer does not have is 1.5 million pounds. That gap is what semi-commercial development finance exists to fill. It is short-term money that funds a scheme creating new commercial and residential space, drawn as the build progresses, and repaid when the finished building is let or sold. It is sized quite differently from a mortgage, and the difference catches out a lot of first-time mixed-use developers. This article walks through the two caps, the drawdown mechanics, what a lender wants before the first pound goes out, and why the exit is the part we spend longest on.

Semi-Commercial Property Finance, a trading name of Lenzie Consulting Ltd (company number 08174104), is a UK finance arranger and introducer and not a lender. Semi-commercial and mixed-use finance arranged for business and investment borrowers is unregulated lending and sits outside the Financial Conduct Authority’s regulated mortgage perimeter, so the business is not FCA authorised. Where an individual borrower will personally occupy the residential element of the property, the loan can fall under regulated rules, and we refer those cases to a regulated firm. Every figure below is an indicative published band from semicommercialpropertyfinance.co.uk as of mid 2026, not an offer of finance.

In the episode below, Georgina walks through how development lenders size a mixed-use scheme and why the exit gets tested harder than the build.

Two caps, one loan: cost and gross development value

A term mortgage is sized on value and rent. A development facility is sized on two figures at once, and the lender funds the lower of the two.

The first is loan to cost. Total project cost means the site or building, the construction contract, professional fees, statutory costs, a contingency and the finance costs themselves. Across our lender panel, a semi-commercial development facility funds up to around 65 to 70 percent of that total. The developer contributes the balance as equity, typically 30 to 35 percent, and usually contributes it first.

The second is loan to gross development value, or GDV. GDV is what the completed scheme is worth once built and either let or sold, as certified by the lender’s valuer. The facility is capped at around 60 to 65 percent of GDV. That cap exists because GDV is the number the exit depends on: if the finished building is worth less than expected, the loan still has to be repaid from it.

On most conversions and small ground-up schemes the cost cap bites first, because the profit margin between cost and GDV is what makes the scheme worth doing. Where the two caps sit close together, the lender is telling you the scheme is thin.

A development lender funds the lower of two numbers, cost and end value, and the exit has to be tested on rent, not on the valuer’s GDV.

A worked example: former showroom to shop and six flats

Take the scheme from the opening paragraph. The site is already owned and valued at 500,000 pounds, the build contract is 820,000 pounds, and fees, contingency and finance costs add 180,000 pounds, giving a total cost of 1,500,000 pounds. The valuer puts the finished GDV at 2,200,000 pounds: six flats at 275,000 pounds each, and a retail unit let at 30,000 pounds a year valued at 550,000 pounds.

Measure	Figure	Result
Total project cost	1,500,000 pounds
Loan to cost at 70%	1,050,000 pounds	the lower cap
Gross development value	2,200,000 pounds
Loan to GDV at 65%	1,430,000 pounds	not the binding cap
Facility	1,050,000 pounds	70% of cost, 48% of GDV
Developer equity	450,000 pounds	30% of cost, the site counts

Because the site is owned outright, most of the 450,000 pounds of equity is already in the deal as land value, so the cash the developer needs to find is modest. At about 0.85 percent a month on an average drawn balance of roughly 60 percent over an 18 month build, rolled-up interest comes to around 96,000 pounds, and a lender arrangement fee at 1.5 to 2 percent adds 16,000 to 21,000 pounds. The debt to be repaid at practical completion is in the region of 1,146,000 pounds.

Now the exit, which is where this example earns its place. A term mortgage on the finished building is sized on rent, not on GDV. Six flats at 1,100 pounds a month give 79,200 pounds a year, the shop adds 30,000 pounds, so combined rent is 109,200 pounds. At a 130 percent interest cover ratio and a 9 percent stress rate, the term loan is 109,200 divided by 1.30 divided by 0.09, which is about 933,000 pounds. That is short of the 1,146,000 pounds owed. Selling one flat at 275,000 pounds brings the debt down to about 871,000 pounds, which the rent then supports. The developer keeps five flats and the shop, and the numbers close. Without that arithmetic done at the start, the developer finds the gap in month 17.

Planning, pre-lets and what the lender wants before the first drawdown

Development lenders on our lender panel will not fund a build without full planning consent, or at minimum a resolution to grant with conditions that can be discharged before works start. Outline consent is not enough for a facility, though bridging can sometimes hold a site while the reserved matters go through.

Beyond planning, the credit paper rests on four things. The professional team: an architect, a quantity surveyor or cost consultant, a structural engineer where the scheme needs one, and a contractor with a track record on similar work. The contract: a fixed-price JCT or equivalent is far easier to fund than a cost-plus arrangement. The programme: a build schedule with milestones the monitoring surveyor can inspect against. And the developer’s own experience, which is where first-timers feel the friction. A first scheme is fundable on a modest, well-supported conversion, but experience improves the terms.

A pre-let on the commercial unit changes the conversation. A signed agreement for lease with a decent covenant, even at a modest rent, gives the valuer a firm figure for the commercial element of GDV and gives the exit lender a rent to test. On a scheme where the commercial unit is 20 to 30 percent of GDV, a pre-let can move a marginal case to an approvable one.

Staged drawdowns and the monitoring surveyor

The facility is not paid out in one sum. A first drawdown covers the site, or refinances it where it is already held, and the works tranche is then released in stages. Each stage follows an inspection by the lender’s monitoring surveyor, who confirms the work claimed has been done to the value claimed and that the cost to complete still fits within the remaining facility.

This is the discipline that protects both sides. The developer pays interest only on what has been drawn, which is why the rolled-up interest in the example is well under a full 18 months on the full facility. The lender never has more money out than there is completed work to secure it against. Delays hurt on both counts: a stalled programme keeps interest rolling while drawdowns stop, and the term of 9 to 24 months can start to look tight. We build a contingency into both the cost plan and the term for that reason.

Conversion or ground-up: same product, different risk

Most semi-commercial development is conversion rather than new build. Taking the vacant upper floors of a high street building and creating three flats, extending a building upward to add residential over retail, or reconfiguring a former bank into a ground-floor unit with flats behind and above. Ground-up schemes on cleared sites are the minority but they are growing, particularly on edge-of-town sites like former showrooms and garages where a single commercial unit with flats above is the natural use.

The finance product is the same either way. What changes is the risk the lender prices. Conversion carries the risk of discovering what the building hides once the strip-out starts; ground-up carries groundworks and services risk but a cleaner programme. Where a project improves an existing building without creating substantially new space, it is a refurbishment case rather than development, and the sizing shifts to value plus a works tranche. Our page on heavy refurbishment finance explains that line, and we spend real time working out which side of it a scheme sits on, because it changes the lender.

2026 outlook for mixed-use development

The Bank of England held base rate at 3.75 percent at its 30 July 2026 decision, with the next decision due on 17 September 2026. Development lenders price monthly and off their own cost of funds, so the band of about 0.70 to 0.95 percent a month has moved less than term mortgage pricing over the past year. What has moved is appetite. Specialist development lenders and challenger banks have been active on mixed-use conversions through 2026, partly because the residential element gives them a sale exit as well as a refinance exit, and partly because permitted development changes have widened what can be done to commercial buildings without a full application. Build cost inflation has cooled compared with 2023 and 2024, which helps the loan to cost arithmetic, though contractor availability in some regions remains tight. For a developer with consent in hand and a fixed-price contract, the second half of 2026 is a reasonable time to take a scheme to market.

FAQ

How much deposit do I need for semi-commercial development finance? Typically 30 to 35 percent of total project cost as equity, because the facility funds up to around 65 to 70 percent of cost. Where you already own the site, its value usually counts as equity, which can reduce the cash you need to find to a small fraction of the total.

Can I get development finance for a shop with flats above without planning permission? Not a development facility. Lenders want full consent, or a resolution to grant with dischargeable conditions, before funding a build. A bridging loan can sometimes hold a site while planning is pursued, and the development facility then refinances it once consent is granted.

What happens if the finished building does not refinance in full? The exit is tested on rent at an interest cover ratio, and the term loan can come in below the development debt even when the GDV looks comfortable. The usual answer is to sell one or more units to reduce the debt to a level the rent supports, and we model that before the facility is taken, not at practical completion.

Is interest paid monthly on a development loan? Usually not. Interest is rolled up and charged only on funds drawn, so it accrues as the build progresses and is repaid with the principal on exit. That keeps the developer’s cash free for the build, but it means the total debt at completion is higher than the facility limit suggests.

Talk to us

If you have a mixed-use scheme with consent, or one close to it, we arrange semi-commercial development finance across specialist development lenders and challenger banks, sized on cost and GDV and structured around a tested exit. Where the end product is a multi-unit building of commercial units and flats, our mixed-use block finance page covers how the completed asset is held and refinanced. See also our guide to how lenders test affordability on combined rent, which is the arithmetic behind every exit in this article.

All figures in this article are indicative published bands for UK semi-commercial and mixed-use finance in 2026, not an offer, a quote or a financial promotion, and any facility is subject to lender terms, valuation and full underwriting. This article was written by Matt Lenzie.