Affordable housing tenure split and how it is negotiated
The tenure split decides how much an affordable housing requirement actually costs. Here is where the mix comes from, how registered provider appetite changes it and how it is drafted.
The affordable housing tenure split is the mix of rented and intermediate products within an affordable housing requirement, and it is settled in the section 106 agreement rather than in the planning permission itself. A council that asks for 30 per cent affordable housing will normally also specify how that 30 per cent divides, most often weighted towards rented tenures with the balance in shared ownership or another intermediate product.
Two things decide what you actually deliver. What the adopted local plan says, and what a registered provider will pay for. Where those diverge, the negotiation is about evidence, not opinion.
Where the tenure split comes from in policy
The percentage requirement and the tenure mix usually sit in different places. The percentage is a local plan policy. The mix is often in the same policy, sometimes in an affordable housing supplementary planning document, and sometimes only in the council's housing strategy or its most recent local housing needs assessment.
National policy sets part of the frame. The Framework has for some years expected a proportion of homes on major sites to be available for affordable home ownership, subject to exceptions for build to rent, specialist housing and some other categories. The August 2026 edition reorganised the Framework into policy-coded chapters, so quote the current policy code and check the text rather than relying on a paragraph number from an older copy.
What councils weigh underneath the policy is the housing register. Where a borough has several thousand households waiting and a long list of overcrowded families needing three and four bedroom homes, the housing team will push for social rent and for larger units within the rented element. That is a conversation about their own evidence base, so read the housing needs assessment before you sit down with them.
Social rent, affordable rent and intermediate products
Rented affordable housing comes in more than one form and the difference matters to value.
| Product | Broad rent basis | Who typically holds it |
|---|---|---|
| Social rent | Formula rent set under the rent standard | Registered provider or council |
| Affordable rent | Up to 80 per cent of local market rent including service charges | Registered provider |
| Shared ownership | Part purchase with rent on the retained share | Registered provider |
| Discounted market sale | Percentage discount on open market value in perpetuity | Often held by the council through a restriction |
Social rent produces the lowest capitalised value to a provider and the highest policy weight for the council. Affordable rent sits above it. Shared ownership and other intermediate products generate a capital receipt on first sale and are worth considerably more to a scheme, which is why the split between rented and intermediate moves the appraisal more than almost any other obligation term.
Do not assume every product is available everywhere. Some authorities will not accept discounted market sale at all, treating it as unaffordable to the households on their register.
Registered provider appetite and what it changes
A tenure split that no registered provider will take is a deliverability problem dressed up as a policy compliance success.
Providers look at unit mix, whether the affordable homes are in defined blocks with their own cores, service charge exposure, whether there is a lift and what it will cost to maintain, ground rents, the management arrangements for shared spaces, and whether they can secure grant. A scheme with fifteen affordable flats spread across four cores in a building with a concierge is a management headache, and the offer will reflect that.
Test the market early. Approach two or three providers active in the borough at the pre-application stage, ask what they would take and at what price, and put the responses into the Affordable Housing Statement. A statement that records real offers is far more persuasive than one that asserts an inability to deliver.
Grant availability changes the answer. Where a provider can secure funding through the national or London affordable homes programmes, social rent becomes deliverable at a price that would not work unfunded.
Clustering, pepper-potting and management
Design and tenure argue with each other here. Planning policy generally wants tenure-blind development, with affordable homes distributed through the scheme and indistinguishable from market homes externally. Providers want their homes grouped so that one management regime covers a defined set of units and one service charge schedule applies.
The usual compromise is small clusters, each served by its own core where the building form allows, distributed across the site rather than concentrated on the least attractive frontage. Put the cluster strategy on a drawing and append it to the section 106 agreement, because "pepper-potted throughout" as a drafting phrase causes arguments later.
Service charges deserve attention on flatted schemes. A shared ownership household paying rent, mortgage and an uncapped service charge on a building with extensive landscaping and a lift is exposed in a way the appraisal rarely shows.
Nomination rights and the obligation wording
Nomination rights let the council place households from its register into the rented homes. The common arrangement gives the authority all initial lettings and a lower proportion of subsequent relets, with the detail set out in a nominations agreement between the council and the provider that sits alongside the planning obligation.
The obligation itself should fix, at minimum, the number of affordable units by tenure and bedroom size, their location by plot number or drawing reference, the transfer price or the mechanism for setting it, the trigger points tying market occupation to affordable delivery, the mortgagee exclusion clause providers require from their lenders, and a cascade if no provider acquires the units within a defined period.
That cascade is worth drafting carefully. A mechanism that converts unsold social rent units into affordable rent, and then into intermediate, with a commuted sum as the last step, prevents a stalled scheme. A cascade that ends in a commuted sum too readily invites the council to resist the whole structure.
Changing the mix after permission
Section 106 obligations can be varied by agreement at any time under section 106A of the Town and Country Planning Act 1990, and by application to the authority once five years have passed since the obligation was entered into, with a right of appeal against refusal.
In practice most tenure changes happen by deed of variation, negotiated when a provider drops out or funding conditions shift. Councils are generally more willing to move between rented products than to reduce the rented proportion overall. Bring the housing team into the conversation before the legal drafting starts.
Where the change is driven by scheme economics rather than provider appetite, expect to support it with a Viability Assessment prepared to the approach in national guidance, using an existing use value plus premium benchmark and disclosed inputs. Councils routinely appoint their own reviewer, and the assessment will be published.
Evidence where the policy mix is not deliverable
Arguing that a policy compliant tenure split cannot be delivered requires three things: an appraisal showing the scheme does not support it, written evidence from providers about what they will take, and an explanation of what you are offering instead.
Review mechanisms are the usual landing point. An early stage review triggered if implementation is delayed, and a late stage review on completion sharing surplus above an agreed threshold, let a council accept less now without giving up value permanently. Understand how the review formulae work before agreeing them, because the profit share above the target can be substantial on a scheme that outperforms.
Other obligations interact with the same headroom. Contributions towards open space and play space on smaller schemes, education, health and highways all sit in the same appraisal, and a council's published infrastructure funding statement shows what it has actually collected and spent. Schemes in a different sector, such as student accommodation and its contributions, run on separate policy tests again.
This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.
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Frequently asked questions
What is an affordable housing tenure split?
It is the division of an affordable housing requirement between rented products, such as social rent and affordable rent, and intermediate products, such as shared ownership or discounted market sale. The percentage requirement says how many affordable homes are needed and the tenure split says what kind they are, which has a far larger effect on scheme value.
Where is the tenure split written down?
Usually in the adopted local plan policy on affordable housing, sometimes in a supplementary planning document, and occasionally only in the council's housing strategy or its local housing needs assessment. Whatever the source, the binding version is the schedule in the section 106 agreement, which fixes numbers, tenures, bedroom sizes and plot locations.
Can the tenure mix be changed after permission is granted?
Yes. Section 106A of the Town and Country Planning Act 1990 allows an obligation to be modified by agreement at any time, and by application to the authority once five years have elapsed, with a right of appeal. Most tenure changes are handled by deed of variation when a registered provider withdraws or funding conditions change.
What is a cascade mechanism?
It is a clause setting out what happens if no registered provider acquires the affordable homes within an agreed period. A well-drafted cascade converts unsold units from one tenure to another in a stated order, with a commuted payment as the final step, so that a scheme is not held up indefinitely by an absent purchaser.
Do councils accept discounted market sale housing?
Some do and some refuse it outright, on the basis that a percentage discount on open market value is still beyond the households on their register. Check the local plan, the affordable housing supplementary planning document and recent committee reports before assuming a product is acceptable, and raise it at pre-application stage rather than at submission.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.