At a Glance
| Feature | Details |
|---|---|
| Typical Structure | Bridging loan for purchase plus staged funding for works, then refinance or sale |
| Initial Advance | Typically up to 70%–75% of current commercial value |
| Works Funding | Often up to 100% of build costs, released in arrears against a monitored schedule |
| Overall Leverage Cap | Total gross loan usually limited to around 65%–70% of GDV |
| Facility Term | Typically 6–18 months, depending on construction scope and exit route |
| Interest Treatment | Usually rolled up or retained, not paid monthly from trading cash flow |
| Exit Routes | MUFB or BTL refinance, or open-market sale of completed units |
| Regulatory Status | Typically unregulated (investment or commercial purpose) |
Indicative parameters only. Terms depend on lender criteria, scheme complexity, and developer experience.
Converting offices, shops, and secondary commercial space into residential flats under Class MA Permitted Development rights is one of the most active value-add strategies in UK property.
However, commercial conversions are frequently mis-financed. Commercial properties earmarked for conversion generally cannot be mortgaged on traditional terms during construction, the planning route carries strict eligibility tests, and exit lenders demand evidence that cannot be produced until works are complete.
This guide details the capital stack from end to end: what Class MA permits, how bridging and build funding work, what a deal costs, what lenders require, and how to execute a clean exit.
What Class MA Permitted Development Allows
Class MA permits a change of use from Class E (shops, offices, financial services, restaurants, medical surgeries, and light industrial) to Class C3 (dwellinghouses) without submitting a full planning application. Instead, developers apply to the local planning authority for Prior Approval.
Since March 2024, statutory updates removed the former 1,500 sq m size limit and the 3-month vacancy requirement. Larger and currently occupied buildings can now qualify.
Crucial distinction: Class MA creates self-contained C3 residential flats or houses only. It does not cover conversion to Houses in Multiple Occupation (HMOs), which require separate planning considerations under C4 or Sui Generis rules.
Can Your Building Qualify? Key Eligibility Checks
Before making an offer on a commercial property, confirm the following core checks with your planning consultant:
- 2 Years of Continuous Class E Use: The building must have had lawful Class E commercial use for a continuous period of at least 2 years prior to the Prior Approval application.
- Article 4 Directions: Local councils can switch off Permitted Development rights in specific streets or districts (often to preserve local office stock or town centres). Always review the local authority's Article 4 map before exchanging contracts.
- Excluded & Protected Sites: Listed buildings, National Parks, and certain protected land types are excluded. Ground-floor conversions in conservation areas face additional restrictions.
- Prior Approval Criteria: Local authorities assess transport impacts, contamination risks, flooding, noise insulation, natural light in living rooms, and safety.
- Statutory Timelines: The local council has 56 days to issue a decision. Once granted, development works must be completed within 3 years of the approval date.
How Bridging Funds a Class MA Scheme
Commercial conversion finance is structured across three clear stages:
- Stage 1: Acquisition. A commercial bridging loan funds the purchase, advancing up to 70%–75% of the current commercial value or purchase price (whichever is lower). Higher leverage is occasionally available at auction or on genuine Below Market Value (BMV) transactions, typically requiring additional security.
- Stage 2: Conversion Works. Build funding is released in staged drawdowns in arrears against a costed schedule of works. A lender-appointed monitoring surveyor confirms each stage before funds release. Lenders often fund up to 100% of build costs, provided the cumulative loan stays within the overall GDV cap.
- Stage 3: Exit. The gross bridging facility (including rolled-up interest and fees) is cleared by refinancing onto a long-term mortgage or selling the completed units.
Development exit option: Where conversion works are complete but sales or lettings are still processing, a Development Exit Loan can replace the initial bridge at a lower interest rate while marketing completes.
Worked Example: Commercial Conversion Capital Stack
Illustrative figures for a vacant office conversion into 8 self-contained flats with Prior Approval in place:
| Item | Amount |
|---|---|
| Commercial Purchase Price | £1,000,000 |
| Initial Purchase Advance (70% LTV) | £700,000 |
| Conversion Works Budget (8 Flats) | £500,000 |
| Projected Gross Development Value (GDV) | £2,000,000 |
| Maximum Facility Cap (65% of GDV) | £1,300,000 |
| Total Facility Requested (Purchase + Works) | £1,200,000 |
| Loan-to-GDV Ratio | 60% |
| Developer Capital Required (Deposit, Fees, SDLT, Contingency) | ~£400,000 (varies by tax profile) |
What Class MA Conversion Finance Costs
When evaluating commercial bridging, compare total monetary outlay in pounds rather than focusing solely on monthly rates:
- Interest Rates: Monthly interest is typically rolled up into the loan or retained, accruing only on drawn funds.
- Arrangement Fees: Usually 1% to 2% of the facility limit.
- Valuation & Monitoring Fees: Paid directly by the borrower to the lender's panel surveyor.
- Legal Fees: Covers both your legal representation and the lender's specialised legal counsel.
- Stamp Duty Land Tax (SDLT): Non-residential SDLT rates generally apply upon initial commercial acquisition. Confirm exact liabilities with your solicitor or tax adviser.
Typical Project Timeline
| Phase | Indicative Timeframe |
|---|---|
| Planning Feasibility & Article 4 Verification | 1–3 Weeks |
| Prior Approval Decision Period | Up to 56 Days |
| Bridging Loan Setup (Underwriting, Valuation, Legals) | 2–6 Weeks |
| Conversion Construction Works | 4–12 Months (depending on scale) |
| Exit Refinance or Open-Market Sales | 1–3 Months |
Long-Term Exit Options: MUFB vs. Individual BTL Sales
- Multi-Unit Freehold Block (MUFB) Mortgage: Ideal if holding the completed block for long-term rental yield under a single freehold title. Underwriters test rental coverage against interest coverage ratios (ICR).
- Individual Buy-to-Let Mortgages: Ideal if splitting the block into individual leasehold units to retain some flats and sell others.
- Open-Market Unit Sales: Selling completed units directly to homebuyers or investors.
What Lenders Need: Developer Checklist
Commercial & Property Debt
Document preparation
Class MA Conversion Developer Checklist
Commercial to Residential Bridging
Document requirements vary by lender and circumstances. Collected documents are not uploaded or verified here.
Lender notes
Lenders want evidence the C3 use is permitted. If approval is pending, expect a lower advance limited to current commercial value.
Lender notes
The monitoring surveyor releases staged drawdowns against this schedule, so include costs, contingency and programme.
Lender notes
First-time developers can strengthen a case with an experienced contractor, project manager or professional team.
Lender notes
Use recent sold prices for comparable flats. The lender's panel valuer will confirm final GDV.
Lender notes
Show where the deposit, fees, SDLT and contingency are coming from, with bank statements explaining large transfers.
Lender notes
A decision in principle is not a binding offer. Support sale prices or rental income with evidence.
Lender notes
List property, savings, borrowing and contingent liabilities for each director or guarantor.
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