Look at the Regulator of Social Housing's own guidance on preliminary applications, and one issue comes up repeatedly: proving that rent is genuinely below market level. Approximately half of applicants drop out at the preliminary stage. The Regulator says that in many cases this is because applicants cannot demonstrate that the rents they charge or intend to charge are below market rent and/or cannot provide sufficient evidence of their intention to become a social housing provider. It also describes providing good evidence of below-market rent as the part of the preliminary stage applicants appear to find most difficult.
We've written previously about why registered provider applications fail more broadly. This time we're going deeper on the fix rather than the problem: what good below-market rent evidence actually looks like, and how to build a case that survives scrutiny rather than falling apart at the first follow-up question.
What "below market rent" actually means to the RSH
The starting definition is simple enough. Social housing includes housing let at below-market rents to people whose needs aren't served by the commercial housing market. The complexity comes in what counts as "rent" for this comparison.
At preliminary application stage, the Regulator is explicit that rent means the charge for the accommodation itself, distinct from any service charge identified separately to residents. It therefore asks applicants to provide information that clearly separates rent from service charges and other charged elements so that it can make a direct comparison with the relevant market rental rate.
So the first practical step, before anything else, is making sure your own paperwork cleanly separates core rent from service charges. If you can't currently produce that split with confidence, that's the place to start.
Choosing your comparator and methodology
Once rent and service charges are properly separated, you need a credible market rent to compare against. The Regulator looks for assurance that the comparator has been worked out on a sound basis, taking into account the type, size and location of the property. It also expects to see the methodology and definitions behind your figures rather than a single unexplained number.
In certain circumstances, it will also expect valuations to have been carried out using a method recognised by the Royal Institution of Chartered Surveyors. That gives the Regulator an established valuation methodology against which it can assess your figures.
It's also worth remembering that the Regulator doesn't rely solely on what you submit. Where it can, it uses publicly available information to test an applicant's evidence. Its own guidance specifically mentions commercial property websites and published social housing rent data as sources it may use to verify intended rent levels. A comparator that looks unusually favourable to your particular case is therefore likely to invite questions.
Where possible, show your proposed rent both as an actual weekly or monthly figure and as a percentage of the evidenced market rent. That makes the relationship between the two immediately clear and gives the assessor less work to do to understand your case.
Separating rent from service charges properly
This is worth returning to because it's such a common failure point. RSH guidance is clear that applicants can't use service charges to make up the shortfall between a below-market core rent and higher underlying property costs. It notes that service charges must reflect the actual cost of delivering the relevant services.
The Regulator has also seen applicants repeatedly reconfigure the split between rent and service charges during the registration process as they understand more about the rules.
That pattern doesn't look like a minor drafting issue. It can suggest that there isn't a robust rent-setting methodology behind the figures at all. It may also raise questions about how clear the charges will be to tenants and whether the assumptions underpinning the wider business plan can be relied upon.
The safest approach is to build your service charge from an itemised, cost-based schedule from the outset and be able to show how you arrived at it if asked, rather than treating it as a balancing figure.
Aligning your rent evidence with your financial model
Rent evidence doesn't exist in isolation. It has to hold up against your wider business plan, forecasts and cash flow assumptions because consistency between the preliminary and detailed application stages matters to the Regulator. Plans can legitimately change, but RSH expects applicants to be able to explain the reasons for any differences.
It's possible for preliminary-stage rent assumptions to look reasonable, only for the detailed financial projections to reveal that the rental income stated won't actually cover costs once the full operating model is applied. If that happens, you're not just fixing a rent figure. You may also need to demonstrate that the wider financial assumptions behind the model are credible.
Before submitting, it's therefore worth deliberately stress-testing your rent assumptions against a range of scenarios, in the same spirit as the wider risk management the Regulator expects to see across an application. What happens if voids are higher than expected? What if maintenance costs rise? What happens if lease costs increase faster than anticipated? Your below-market rent case needs to work alongside those assumptions rather than only in the most favourable scenario.
Rent setting rules to factor in
Being below market rent is a separate question from whether your rent complies with the formal rent-setting rules, and both need to be right.
There is also an important distinction here. At preliminary registration stage, the RSH's below-market test compares the accommodation charge with market rent while treating separately identified service charges separately. For Affordable Rent under the Rent Standard, however, the terminology is different: gross rent and gross market rent both include service charges.
The Rent Standard 2026 took effect on 1 April 2026. For Social Rent housing, the maximum initial weekly rent for a new tenant is generally formula rent, subject to the applicable rent cap, with flexibility of up to 5% above formula rent. For supported housing that falls within the Rent Standard, the flexibility is up to 10%. For existing tenants, annual increases are generally limited by the CPI plus 1% framework, subject to the detailed rules in the Standard.
Affordable Rent works differently. The Rent Standard provides that the maximum initial weekly gross rent is the higher of 80% of weekly gross market rent and the applicable Social Rent for the accommodation. In this context, gross rent includes service charges, and gross market rent must be based on a valuation using a RICS-recognised method.
Some accommodation sits outside the mainstream Rent Standard rules altogether, including certain categories such as specialised supported housing. It's therefore worth checking early which regime actually applies to the accommodation you're proposing rather than assuming that the standard Social Rent rules apply by default.
Lease-based models: a particular risk area
If your model involves leasing property from the private sector to make it available as social housing, expect your rent evidence to come under particularly close scrutiny. Applicants that pay something close to market rate to lease a property and then need to charge tenants a below-market rent can struggle to demonstrate how the arrangement remains viable over time.
Long-term leases can create particular issues where lease costs are index-linked. The Regulator will want to understand how your board has considered the risk of costs increasing over a long lease term while rental income remains subject to rent-setting policy and other external pressures. It will also expect you to consider how you would manage an exit if changes in policy or costs made the model unworkable, and how periods of voids have been reflected in your assumptions.
Shorter lease arrangements can provide greater flexibility, but they don't remove the fundamental viability question: how will you sustain a model based on market-level property costs while keeping tenant rents below market? If your organisation has secured a lease at genuinely favourable terms, perhaps because the property owner is considering social as well as financial returns, that can materially improve the viability of the model and should be evidenced clearly.
Be prepared for the Regulator to look at the relationship behind those terms too. Its guidance notes that below-market leases can sometimes raise questions about the relationship between the applicant and property owner and about the independence of the intending provider.
A short checklist before you submit
Before your RSH application goes in, we'd suggest checking that:
- Rent and service charges are shown as clearly separated figures for the preliminary below-market assessment.
- Your market-rent comparator is evidenced, with the methodology and relevant property characteristics clearly stated.
- Where appropriate, your valuation uses a RICS-recognised approach.
- Your proposed rent is shown both as an actual figure and as a percentage of the evidenced market rent.
- Service charges are supported by an itemised, cost-based schedule rather than being used as a balancing figure.
- Rent assumptions in your application are consistent with your financial model and business plan.
- You've established which rent-setting regime applies to your accommodation and checked your figures against the current Rent Standard where applicable.
- If you're using a lease-based model, you can explain how below-market rents remain sustainable against actual lease costs, voids and downside scenarios.
How Thornton & Lowe can help
None of this is about producing more paperwork for the sake of it. It's about producing the right evidence, presented in a way that shows the Regulator you understand your own numbers, how they were calculated and how they fit into a viable operating model.
At Thornton & Lowe, we help organisations preparing for RSH registration test their rent evidence and wider application before submission. Our support can include document reviews, gap analysis, feedback on financial and operational evidence and wider assistance with preparing for the registration process.
That sits within our broader social housing consultancy services, where we work with housing associations and organisations entering the regulated sector on commercial, operational and governance challenges. We can guide you through the process of becoming a Registered Provider of social housing.
If you're working towards registration and want a second opinion on whether your rent case would stand up to scrutiny, we're happy to talk it through.
