Permitted Development Finance
Short-term finance for conversions carried out under permitted development rights — Class MA office and retail to residential, Class Q agricultural to residential, Class N retail to residential, HMO conversions and upward extensions. Fund the purchase and 100% of the conversion works, without needing full planning permission.
Written by Harry Baker, Director · Aura Capital · Updated July 2026
Three main permitted development routes for finance
Commercial & office to residential
The most common PD finance route. Converts Class E buildings (offices, retail, light industrial) to residential dwellings. 2024 rule changes removed the floorspace cap and vacancy requirement.
Agricultural buildings to residential
Converts redundant agricultural buildings to residential dwellings. Rural location, structural integrity and the conversion specification are the key lender focus points.
Retail, HMO conversions & upward extensions
Class N covers certain retail to residential conversions. Class L covers HMO creation in some cases. Part 20 covers upward extensions. Each has its own lender criteria and planning nuances.
What is permitted development finance?
Permitted development finance is short-term lending used to fund the purchase and conversion of a property under permitted development rights — without the need for full planning permission for a change of use. The lender takes a first legal charge over the building and advances against its current value on day one, then releases the conversion costs in staged drawdowns as works progress.
Because PD schemes convert an existing building rather than build from scratch, lenders price and structure them as heavy refurbishment rather than ground-up development — which typically means faster underwriting, lighter monitoring requirements, and completion timelines measured in days rather than months.
Permitted development does not mean permission-free. Prior approval from the local planning authority is required in most cases, and Article 4 Directions can remove PD rights in specific areas entirely. Both affect pricing and lender appetite significantly.
PD finance funds an existing building's conversion — the structural shell already exists. Ground-up development finance funds a new build from foundations. Lenders treat the risk profile differently: PD conversions have lower construction risk, which is why they typically achieve better LTV, lower rates and faster execution than equivalent new-build schemes.
The 2024 Class MA rule changes — what changed and why it matters
Two significant amendments to the Town and Country Planning (General Permitted Development) (England) Order 2015 came into effect in 2024, materially expanding the pool of buildings eligible for Class MA conversion finance.
The previous 1,500 sqm floorspace limit for Class MA conversions was removed. Larger commercial buildings — previously excluded from PD conversion rights — became eligible. This significantly expanded the market, particularly for larger town-centre office blocks and multi-storey retail buildings. Lenders have responded with increased appetite for larger Class MA schemes that would previously have required full planning.
The requirement for a building to have been vacant for three months before submitting a Class MA prior approval application was removed. Previously, a developer needed to demonstrate vacancy before the clock even started on the 56-day determination window. Removing this condition means active commercial buildings can now be acquired and a prior approval submitted immediately — compressing the overall timeline from acquisition to finance instruction.
Both changes have driven a marked increase in Class MA lending activity in 2025 and 2026. If you were previously told a building was too large or not yet vacant to qualify, it is worth reassessing under the updated rules.
How permitted development finance is structured
A PD finance facility has two components: a day-one advance against the current market value of the property, and a staged works facility that releases conversion costs as each phase is completed and certified.
The LTGDV constraint
Total debt — day-one advance plus works facility plus rolled interest — is capped at 70–75% of gross development value (GDV). This often becomes the binding constraint, not LTV alone. The higher the conversion uplift relative to purchase price, the more headroom you have.
Interest during works
Interest is typically rolled up or retained during the conversion — no monthly payments required while works are ongoing. This protects cashflow during the conversion phase and keeps the borrower focused on delivery rather than debt servicing.
Monitoring surveyors
Most lenders appoint a monitoring surveyor to certify each drawdown stage. On smaller, simpler Class MA conversions some lenders can drawdown without a MS, which reduces cost and speeds up each release.
Term and timing
Typical facility term is 12–24 months. Class MA conversions vary widely — a straightforward office floor conversion might complete in 6–9 months; a larger multi-unit scheme might need 18 months. Build the realistic timeline in from the outset.
PD bridging loan vs development finance — which structure fits your project?
Most PD conversions are funded as bridging loans (heavy refurbishment structure) rather than development finance. The distinction matters because the two products have meaningfully different pricing, lender panels, monitoring requirements and advance profiles.
| Feature | PD bridging loan | Development finance |
|---|---|---|
| Typical rates | From 0.75% pm | From 0.90% pm |
| Day-one advance | Up to 80% current value | 60–70% of site/building value |
| Works funding | 100% in staged drawdowns | Up to 100% LTC in staged drawdowns |
| LTGDV cap | 70–75% | 60–70% (stretched senior up to 75%) |
| Monitoring surveyor | Often required; can sometimes avoid on smaller schemes | Almost always required at every drawdown |
| Underwriting timeline | Faster — treated as heavy refurb | Slower — full development appraisal |
| Lender panel | Wider — most bridging lenders with PD experience | Narrower — dedicated development lenders |
| Best suited to | Standard conversions where structure is intact | Schemes with significant structural works or new build elements |
The right structure depends on the conversion scope. A Class MA office conversion that keeps the structural frame and replaces the interior fits a bridging loan well. A Class MA conversion that involves significant structural intervention, new floor plates or demolition and rebuild elements is better structured as development finance. We assess each case individually.
Permitted development finance rates & LTVs 2026
Pricing is driven by conversion type, prior approval status, LTV, lender and the overall strength of the case. The rates below reflect the current market as at July 2026.
| Conversion type | Rate | Day-one LTV | Max LTGDV | Notes |
|---|---|---|---|---|
| Class MA — prior approval granted | From 0.75% pm | Up to 80% | 70–75% | Best pricing and widest lender panel. Clean title and strong comparables. |
| Class MA — prior approval pending | From 0.90% pm | Up to 75% | 70% | Higher rate reflects prior approval risk. Some lenders decline pre-approval. Lower initial advance. |
| HMO conversion (Class L / permitted) | From 0.80% pm | Up to 80% | 70–75% | Depends on HMO licence status and local authority area. Article 4 in some boroughs. |
| Class Q — agricultural to residential | From 0.85% pm | Up to 65–70% | 65–70% | Specialist panel. Rural location, structural integrity and conversion spec are key factors. |
| Part 20 — upward extension | From 0.90% pm | Up to 65% | 65–70% | Structural assessment required. Engineer sign-off on host building load-bearing capacity. |
| Class N / retail conversion | From 0.85% pm | Up to 70% | 65–70% | Assessed case by case. Location and marketability of residential units critical. |
Rates correct July 2026. Arrangement fees typically 1.5–2% of facility. All rates subject to individual case assessment.
Prior approval: what it means for your finance
Permitted development does not mean permission-free. Class MA, Class Q and most other PD rights require prior approval from the local planning authority before conversion works can begin. Prior approval is not full planning permission — the LPA assesses a narrower set of considerations (transport, flooding, contamination, natural light for Class MA) — but it is a meaningful gateway that affects your finance options significantly.
Prior approval granted — best position
Unconditional prior approval in hand: widest lender panel, best pricing, highest LTV. The planning risk has been resolved and the lender is underwriting the conversion rather than the planning outcome.
Prior approval pending — still fundable
Some lenders will advance pre-prior-approval at a lower LTV and slightly higher rate, accepting the approval risk. The 56-day determination window needs to be factored into the overall finance timeline.
Prior approval refused — different route needed
Refusal is rare on Class MA but it does happen, typically on transport impact or natural light grounds. A refused prior approval means the conversion requires full planning permission — a materially different proposition for lenders.
Prior approval with conditions
Conditions attached to prior approval — materials, landscaping, noise mitigation — need to be read carefully. Conditions that affect the conversion specification or timeline should be disclosed to the lender from the outset.
Local planning authorities must determine a Class MA prior approval application within 56 days of validation. If they fail to respond within 56 days, prior approval is deemed granted. This statutory deadline is a useful backstop — but do not rely on it as a strategy. LPAs that miss the deadline often issue late determinations anyway, and a deemed grant can be challenged.
Article 4 Directions — when PD rights don't apply
An Article 4 Direction is a designation made by a local planning authority that removes permitted development rights in a specific area. If your property sits within an Article 4 area that covers the relevant PD right, the conversion is not a PD project — it requires a full planning application instead.
Several London boroughs have Article 4 Directions covering Class MA office-to-residential conversions, including parts of the City of London, Camden, Islington and others. A number of other major cities and town centres have also applied Article 4 restrictions in recent years. Always verify Article 4 status with the local planning authority before assuming a building qualifies for PD conversion.
What Article 4 means for finance
An Article 4 Direction does not make the conversion impossible — it means you need full planning permission. The finance structure changes: longer timeline, higher planning risk, different lender panel and usually a lower initial LTV until planning is resolved.
How we check
We verify Article 4 coverage as part of initial feasibility on every PD finance enquiry. If Article 4 applies, we can still help — either through a planning bridge while full permission is sought, or by restructuring the deal as a planning-led scheme.
Class Q and Class N: agricultural and retail conversions
Class Q — agricultural buildings to residential
Class Q permits the conversion of agricultural buildings to a maximum of 10 residential dwellings, subject to prior approval. It is the main route for barn conversions and redundant farm building schemes. Finance is available but the lender panel is narrower than for Class MA, and several factors affect lender appetite significantly.
What lenders focus on for Class Q
Structural integrity of the agricultural building — conversion must be feasible without wholesale rebuild. Location and accessibility — rural isolation materially affects residential marketability and the exit assumption. Prior approval granted. Conversion specification — quality of the proposed residential units relative to local comparables.
Class Q constraints
Maximum 10 dwellings per agricultural unit. Must have been in agricultural use. Cannot involve works that amount to a new build. Some Class Q schemes that push structural limits are better funded as development finance or full planning schemes than as PD conversions.
Class N — retail to residential
Class N permits conversions from certain retail and takeaway uses (former Class A1/A2 uses) to residential. It covers a narrower range of buildings than Class MA and has received less lender attention, but it is financeable through specialist lenders where the location, prior approval and conversion specification are strong.
Class MA lenders are assessing an urban or suburban commercial building in a location with established residential comparables. Class Q lenders are assessing a rural agricultural structure where the residential market may be thin. This is why Class Q typically achieves lower LTV and higher rates — the exit risk is greater, not because the conversion is harder, but because the sales or refinance route is less certain.
First-time developers and permitted development finance
PD conversions are a genuinely accessible entry point for first-time developers. Compared to ground-up development, they involve lower construction risk (the structural shell already exists), shorter programmes and a simpler planning route. Lenders reflect this in their underwriting — developer track record matters, but it matters less on a PD conversion than on a new-build scheme.
What lenders assess on first-time deals
Asset quality, location and comparables carry the most weight. Prior approval status. Quality and credibility of the conversion specification and contractor. Strength of the exit — a realistic sales or refinance route with supporting evidence. Personal financial position and the ability to cover cost overruns.
How to strengthen a first-time application
Prepare a thorough information pack before approaching lenders. Get a credible contractor on board early. Have an agent's letter on expected residential values. Show the exit route clearly. Personal guarantees are typically required on first-time deals. A specialist broker can match you to lenders who actively consider first-time developers.
Expect a slightly lower LTV on a first-time deal than on an experienced developer's equivalent scheme — typically 70–75% vs the 80% available to track-record borrowers on Class MA. This is the lender's buffer against inexperience risk. As your track record builds, LTV improves. One successfully completed scheme changes your borrowing options significantly.
Exit strategies for PD finance
Lenders want a credible, timed exit from the outset. The most common routes are individual unit sales on completion, block disposal to an investor or housing association, and refinance onto buy-to-let or term debt for retained units.
| Exit type | What it looks like | What lenders want to see |
|---|---|---|
| Open market sales | Units sold individually on completion, typically through estate agents. The most common exit on smaller Class MA schemes. | Comparable evidence, agent's letter, realistic pricing and a credible absorption period for the number of units. |
| Block sale | All or most units sold to a single buyer — investor, housing association or developer — in one transaction. | Buyer interest, heads of terms or rationale for the discount to individual unit values. |
| Buy-to-let refinance | Completed units let to tenants and refinanced onto individual BTL mortgages or a portfolio term loan. | Expected rental values, likely BTL lender route and whether the numbers stack at the expected interest rate. |
| Mixed exit | Some units sold, some retained and let. Common on schemes where some units have higher rental yield than sale value. | Clear plan for both routes, partial redemption mechanics and a realistic overall timeline. |
How to apply for PD finance
PD finance typically completes in 10–15 working days from full application where prior approval is in hand and the information pack is complete. The earlier in the process you approach a broker, the more smoothly the transition from prior approval to funded conversion runs.
Feasibility and lender fit
We review the building, conversion class, prior approval status, Article 4 position, LTV requirement, conversion specification and exit. We match the case to the right lenders from our whole-of-market panel and provide indicative terms — same day on most enquiries, before any costs are committed.
DIP and lender instruction
Decision in principle typically issued within 24 hours of a full pack submission. We instruct the lender, confirm the valuation route (RICS inspection or desktop depending on loan size and lender) and confirm legal representation.
Valuation, legals and monitoring surveyor
Valuer appointed. Solicitors instructed on both sides. Monitoring surveyor confirmed where required. Title is reviewed, prior approval checked and any conditions noted. Most delays happen at legal stage — flag title issues early.
Completion and works commencement
Day-one advance released on completion. Works begin. Subsequent drawdowns released as each phase is certified by the monitoring surveyor or, on eligible smaller schemes, by inspection. Interest rolled or retained throughout.
Completion of works and exit
Conversion completed. Building control sign-off. Units marketed for sale or let, or refinance onto term debt instructed. Lender redeemed from sale proceeds or refinance. Development exit bridging available if more time is needed at this stage.
Case study: Class MA office-to-residential conversion, Leyton E10
Office-to-residential conversion · East London · Class MA
Completed caseThe situation: A developer acquired a first-floor office suite in a mixed-use building in Leyton, East London, with prior approval in hand for conversion to six residential apartments under Class MA. The existing lender had declined to fund the works element. Aura was instructed to find a lender able to fund both the acquisition refinance and 100% of conversion costs in a single facility.
The structure: Day-one advance of 78% against current open market value refinanced the purchase debt and released capital for site preparation. The works facility — funded 100% in three staged drawdowns certified by the monitoring surveyor — covered strip-out, internal reconfiguration, kitchen and bathroom fit-out, and all M&E.
The exit: Four of the six units were sold on the open market within 90 days of practical completion. The remaining two were retained and refinanced onto individual buy-to-let mortgages, fully repaying the bridging facility.
Permitted development finance questions answered
Permitted development finance is short-term lending used to fund the purchase and conversion of a property under permitted development rights — without the need for full planning permission for a change of use. It covers the day-one acquisition or refinance and funds 100% of the conversion works in staged drawdowns. The most common use is Class MA office-to-residential conversion, but the same structure applies to Class Q agricultural conversions, Class N retail conversions, HMO conversions and upward extensions.
Lenders will consider Class MA (commercial, business and service to residential — the main office-to-resi route), Class Q (agricultural buildings to residential dwellings), Class N (certain retail and takeaway uses to residential), Class L (HMO conversions in some circumstances), Class G (conversion of floors above commercial to residential) and Part 20 upward extensions. Appetite varies significantly between lenders and by conversion type — Class MA on a town-centre office block is a very different proposition to Class Q on a remote rural barn.
Two significant changes took effect in 2024. In March 2024, the 1,500 sqm floorspace cap was removed — larger commercial buildings became eligible for Class MA conversion for the first time. In May 2024, the three-month vacancy requirement was removed — buildings no longer need to have been vacant before a prior approval application is submitted. Both changes materially expanded the pool of qualifying buildings and have driven increased lender appetite for Class MA projects in 2025 and 2026.
Not always, but prior approval significantly affects pricing, LTV and lender appetite. Some lenders will advance funds pre-prior-approval at a lower LTV, accepting the approval risk as part of the deal structure. Most prefer prior approval to be in hand before completing. Prior approval takes up to 56 days for the local authority to determine — if they fail to respond, approval is deemed granted. Where prior approval has been granted and is unconditional, the best pricing and widest lender panel applies.
Up to 80% of the current market value on day one on the strongest Class MA cases with prior approval in hand. The binding constraint is often loan-to-GDV rather than LTV alone — most lenders cap total debt at 70–75% of gross development value. Class Q and upward extensions typically achieve 65–70% LTV. The day-one advance is separate from the works facility, which funds 100% of conversion costs in staged drawdowns — but the total of both is subject to the LTGDV cap.
Yes. The works element of a PD finance facility funds 100% of the conversion costs in staged drawdowns tied to build progress. Total debt — day-one advance plus works facility plus rolled interest — is subject to the overall LTGDV cap, which typically sits at 70–75% of GDV. If the GDV uplift on your scheme is strong relative to the purchase price, there is usually enough room within the LTGDV cap to cover both the acquisition and all works costs.
An Article 4 Direction removes permitted development rights in a specific area. If your property is in an Article 4 area covering the relevant PD class, the conversion requires full planning permission rather than just prior approval — a materially different proposition. Several London boroughs have Article 4 Directions covering Class MA office-to-residential. We check Article 4 status as part of initial feasibility on every PD finance enquiry.
Yes, in suitable cases. PD conversions are structurally simpler than ground-up development — the shell already exists — which makes the lending proposition more accessible for first-time developers. Lenders focus on asset quality, prior approval status, conversion specification, exit route and contractor credibility. Developer track record matters but carries less weight on a PD conversion than on a new-build scheme. Expect a slightly lower initial LTV than an experienced developer would achieve on the same scheme.
Yes. Class Q agricultural-to-residential conversions are financeable through specialist lenders, though the panel is narrower than for Class MA. Key considerations are the building's structural integrity, rural location and its effect on residential marketability, conversion specification and the credibility of the sales or refinance exit. Class Q typically achieves 65–70% LTV at rates from 0.85% per month.
Rates start from around 0.75% per month for strong Class MA cases with prior approval in hand and sensible LTV. Most cases complete in the 0.85%–1.15% range depending on conversion type, prior approval status, LTV, lender and scheme complexity. Class Q and upward extensions price at the higher end. Arrangement fees are typically 1.5–2% of the facility. Pre-prior-approval cases add a risk premium over post-approval equivalents.
Fund Your Permitted Development Conversion
Tell us the building, the PD class, prior approval status and conversion scope. We'll come back the same day with whether the case is viable, which lenders are the right fit and indicative terms — before any costs are committed.
Risk warning: any loan secured against property may be repossessed if repayments are not maintained. Permitted development rights are subject to local planning authority assessment and Article 4 Directions. Rates correct July 2026 and subject to change. Aura Capital is an independent brokerage and not a lender.