Community Infrastructure Levy exemptions and how to claim
Self-builders rarely lose the levy exemption on the merits. They lose it by starting work before the decision arrives or by missing the commencement notice.
The cil self build exemption is generous and easy to lose. It removes the Community Infrastructure Levy charge entirely from a house you build and live in, and it is forfeited in full if you pour a foundation one day before the council issues its decision. Most self-builders who end up paying a five-figure levy bill did nothing wrong with the house. They got the order of the forms wrong.
Which exemptions and reliefs exist
The Community Infrastructure Levy Regulations 2010 provide several routes out of a charge, and they are not interchangeable.
| Relief | What it covers | Who claims it |
|---|---|---|
| Self-build exemption | A whole new dwelling built by or for the occupier | The person who will live in it |
| Residential annex exemption | An annex within the curtilage of the main dwelling | The owner-occupier of the main dwelling |
| Residential extension exemption | An extension under the floor area threshold | The owner-occupier |
| Social housing relief | Qualifying affordable housing | The provider |
| Charitable relief | Development used for charitable purposes | The charity |
| Exceptional circumstances relief | Site-specific hardship, where the authority offers it | The landowner |
Two further points are worth knowing before you start. Development creating less than 100 square metres of new gross internal floorspace is not liable at all, provided it does not create a new dwelling. And an authority only charges the levy if it has adopted a charging schedule, so the first question is always whether your council has one and what its current indexed rates are.
That last relief is rare, is available only where the charging authority has resolved to offer it, and requires a viability case supported by an independent assessment. Where a scheme cannot carry the levy, a Viability Assessment prepared to the recognised professional standard is the evidence needed.
The self-build exemption and its conditions
The exemption applies to a new dwelling built by the person who will occupy it as their sole or main residence, whether they physically build it themselves or employ a contractor. Custom build arrangements with a developer can qualify, and the test is occupation rather than who held the trowel.
Three conditions follow the grant. You must occupy the dwelling as your principal residence, you must do so for three years from the date of the compliance certificate, and you must supply the evidence within six months of completion.
That evidence is specific: a building regulations completion certificate, title plans showing the dwelling and the land within its curtilage, and one of an approved claim under the self-build VAT refund scheme, a specialist self-build warranty, or an approved self-build mortgage. Assemble those before completion, because six months passes quickly on a project that has already run over.
The residential extension and annexe exemptions
An extension to your own home is exempt from the levy where it falls within the residential extension exemption, and an annex within the curtilage of your home is exempt under a parallel provision. Both require you to own the main dwelling and occupy it as your principal residence.
The annex exemption carries its own three-year clawback. Let the annex separately, sell it off, or sell the main dwelling within that period and the exemption is withdrawn. Letting it to a family member without a separate tenancy generally does not trigger it, but the position depends on the facts and is worth checking with the collecting authority in writing.
Both exemptions still need claiming through the forms. An extension that would be exempt but was never claimed is chargeable, and authorities are not obliged to remind you.
The order of the forms and why it matters
This is the part that costs people money. The sequence is fixed and every step has to be completed before the one after it.
- Assume liability. Submit the assumption of liability form to the collecting authority before anything else, naming who will pay.
- Claim the exemption or relief on the correct form for the type of claim.
- Wait for the authority's written decision granting the exemption. Do not start work.
- Submit a commencement notice specifying the date work will begin, and submit it before that date.
- Start work.
- For a self-build claim, submit the second part of the form with the supporting evidence within six months of the compliance certificate.
Miss step three and start early, and the exemption lapses. Miss step four, and the exemption is withdrawn and a surcharge applies, calculated under the Regulations as 20 per cent of the chargeable amount or £2,500, whichever is lower. Check the current Regulations for the figures, because they are amended from time to time.
None of this is intuitive, which is why it catches self-builders rather than developers. A developer has a quantity surveyor watching the levy. A self-builder has a groundworker who turns up on a Monday.
Commencement notices and the consequence of getting one wrong
The commencement notice is the single most dangerous form in the process. It has to be received by the collecting authority before development starts, and "starts" means the first material operation, which includes digging foundations, laying services and constructing an access.
Demolition and site clearance can also count depending on the circumstances, so if the site needs clearing before the notice is served, take advice first.
Where no commencement notice is served, the authority can determine a deemed commencement date, usually the earliest date it can evidence, and issue a demand notice for the full amount with instalments lost. The right to pay by instalments depends on the notice being served correctly, so a scheme with a large charge can move from a staged payment plan to a single immediate demand.
Send the notice by a method that produces a receipt and keep it. Disputes about whether a notice arrived are common, and the burden of proof is not on the council.
The clawback period and disqualifying events
For three years after the compliance certificate, the exemption remains conditional. Disqualifying events include the dwelling ceasing to be the claimant's principal residence, letting it out, and selling it, along with the equivalent events for an annex.
Where a disqualifying event happens, you must notify the collecting authority within a set period, and the full levy becomes payable. The obligation falls on the person who claimed the exemption, and it survives a sale.
Plan around it. A self-builder who intends to sell after 18 months should budget for the levy rather than assume the exemption will hold, and a purchaser's solicitor will ask about the position on any recently built house in a charging area.
A change of use that removes the residential character can also trigger clawback. If a room becomes a commercial office or a holiday let, check the position before advertising it.
Appealing a surcharge or a determination
Two appeal routes run in parallel and go to different bodies.
Questions about the amount charged, the apportionment of liability between owners, and certain relief decisions go to the Valuation Office Agency, usually after first asking the collecting authority to review its calculation. There is a short window for requesting that review, so act on the day the demand notice arrives.
Appeals against a surcharge, against a deemed commencement date, and against a levy stop notice go to the Planning Inspectorate. Grounds are narrow and largely procedural, and the most successful arguments are evidential: the notice was served, the authority received it, the date is wrong.
Where a prior approval route rather than a full permission was used, check the liability position early, because Class MA after the removal of the floorspace cap creates dwellings without a planning permission in the conventional sense, and the levy obligations still apply.
Finally, keep an eye on the wider reform. The Levelling-up and Regeneration Act 2023 contains powers for an Infrastructure Levy to replace the current system, and the position on implementation should be checked before advising on a long programme. Set out the levy assumptions in the Planning Statement so the whole team is working from the same figure, and see PlanScope pricing if you want the supporting documents drafted rather than written from scratch.
This is general guidance, not legal advice. Check the position with your collecting authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Who can claim the self-build exemption?
Anyone building a new dwelling they will occupy as their sole or main residence, whether they build it themselves or employ a contractor. Custom build arrangements can qualify. The test is occupation rather than who carried out the work, and the dwelling must remain the claimant's principal residence for three years from the compliance certificate.
In what order do the forms have to be submitted?
Assume liability first, then claim the exemption, then wait for the written decision granting it, then serve a commencement notice before the day work starts, then begin. For a self-build claim, supporting evidence follows within six months of completion. Starting work before the decision arrives loses the exemption entirely.
What happens if I forget the commencement notice?
The exemption is withdrawn and a surcharge applies, set in the Regulations at 20 per cent of the chargeable amount or £2,500, whichever is lower. The right to pay by instalments also depends on the notice, so a staged payment plan can become a single immediate demand. Check the current Regulations, since the figures are amended periodically.
What evidence does a self-build claim need?
A building regulations completion certificate, title plans showing the dwelling and its curtilage, and one of an approved claim under the self-build VAT refund scheme, a specialist self-build warranty, or an approved self-build mortgage. All of it within six months of the compliance certificate, so assemble the documents before the house is finished.
Where do I appeal a levy decision?
Two routes. Questions about the chargeable amount, apportionment between owners and certain relief decisions go to the Valuation Office Agency, normally after asking the collecting authority to review its calculation within a short window. Appeals against a surcharge, a deemed commencement date or a levy stop notice go to the Planning Inspectorate.
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.