Losing the self-build CIL exemption and the bill after

The self build CIL exemption is withdrawn more often than most people expect, and the bill that follows is the whole levy charge, not a reduced one. The Community Infrastructure Levy Regulations 2010 make the exemption conditional on the claimant occupying the dwelling as their sole or main residence for three years after completion, and on a second form being submitted within six months of completion. Miss either and the exemption falls away.

The three year clock is the part that catches people. A job move in year two, a relationship ending, or a decision to let the house while working abroad each triggers the clawback.

What the self-build exemption covers

The exemption applies to a whole new dwelling built by, or commissioned by, a person who will occupy it as their sole or main residence. It covers custom build as well as hands-on self build, so employing a contractor to build the house does not disqualify the claim.

It does not cover a dwelling built for sale, a dwelling built for a family member to occupy, or an additional unit built alongside the one you will live in. On a two plot site where you will live in one house and sell the other, only the one you occupy is exempt.

Separate exemptions exist for a residential annex and for a residential extension, claimed on their own forms and with their own rules. An annex carries its own three year restriction, so letting or selling an annex separately within that period triggers a clawback on the annex.

The forms and the order they must be served in

The sequence is rigid and there is no discretion to correct it later.

1. Assume liability for the levy. This has to be done by the person claiming the exemption.
2. Submit the self-build exemption claim, part one, and wait for the collecting authority to grant it in writing.
3. Serve the commencement notice, which must be received before any work starts.
4. Build.
5. Submit part two of the claim within six months of completion, with the supporting evidence.

Two failures are fatal. Starting work before the exemption has been granted loses it outright, because the Regulations require the exemption to be in place before the development starts. And failing to submit part two within six months of completion is itself a disqualifying event, so the charge becomes payable even though you are living in the house exactly as you said you would.

Completion for this purpose is normally evidenced by the building control completion certificate, so the six month period runs from a date you may not have noticed. Diary it the day the certificate arrives.

What part two has to prove

Part two is an evidence exercise, and it asks for three things: that you own the dwelling, that you occupy it as your main residence, and that it was a self build project in fact.

Ownership comes from the title. Occupation comes from council tax and utility bills in your name at that address. The self build element comes from one of a defined set of documents, being an approved VAT refund claim for a new house, a specialist self build warranty, or an approved self build mortgage.

That last requirement is the one that trips up projects funded from savings or from a conventional mortgage on another property. Where none of the three documents exists, the exemption cannot be confirmed. Decide at the outset which of them you will be able to produce, and if the answer is the VAT claim, keep every invoice from day one.

Get the acknowledgement from the authority in writing, and keep it with the title deeds. It will be asked for on sale.

The occupation period and the disqualifying events

The clawback period runs for three years from completion. During it, the Regulations list events that disqualify the exemption.

Selling the dwelling. Letting it out. Ceasing to occupy it as your sole or main residence. A change of use away from residential. And, as above, failing to submit part two in time.

Two nuances are worth understanding. The test is sole or main residence, so a period working elsewhere while the house remains your main home is a different question from moving out and letting it, and the facts matter. Taking in a lodger while continuing to live in the house is not the same as letting the dwelling. Both of those are situations where you should take advice on the specific facts rather than assume.

If a disqualifying event happens, you must notify the collecting authority, and the Regulations set a short deadline for doing so, currently measured in days rather than weeks. Check the current text for the period. Failing to notify attracts a surcharge on top of the reinstated charge, so a voluntary disclosure costs less than being found out on a land registry search.

How the clawback is calculated and collected

The exemption is withdrawn and the full chargeable amount for the dwelling becomes payable. It is not apportioned for the time you did live there, and it is not discounted because the sale was forced.

The authority issues a demand notice. Payment is normally required in a single sum, because instalment policies attach to the original liability and a reinstated charge falls due immediately. Late payment then attracts its own surcharges and interest.

The practical effect on a self builder selling in year two is a levy bill arriving in the middle of a conveyance, often at a figure nobody had budgeted for, and secured against the land. Solicitors acting on the sale will find the liability notice, so it cannot be left to chance.

Where the charge is disputed, the routes are the same as for any levy dispute: a review or an appeal depending on the ground, each with a short deadline running from the date of the notice. An appeal against the withdrawal of the exemption goes to the Planning Inspectorate.

Evidence to keep during and after the build

Keep one folder, from the first form to the third anniversary of completion:

• The liability notice, the assumption of liability and the granted exemption.
• The commencement notice with proof of receipt.
• The building control completion certificate.
• Part two as submitted, its evidence bundle and the authority's acknowledgement.
• Council tax and utility bills covering the whole three year period.
• The VAT claim, warranty or self build mortgage documentation.
• Every invoice, if the VAT route is the one you are relying on.

The reason to keep utility bills for three years rather than three months is simple. If the authority questions occupation later, contemporaneous bills are the only evidence that settles it.

Avoiding the common ways the exemption is lost

Five habits prevent nearly every clawback.

Grant before ground. Do not let a digger on site until the exemption has been granted in writing and the commencement notice acknowledged.

Diary the completion date and the six month deadline for part two on the day the completion certificate is issued.

Decide the self build evidence route at the start, not at the end.

Before agreeing any sale, let or change of circumstances within three years, work out the levy consequence and put it in the calculation. On some sites the charge is large enough to change the decision.

And if a disqualifying event is unavoidable, notify the authority promptly and pay rather than waiting. The surcharge for non-notification is avoidable money.

Appraise the project both ways. A self builder who models the scheme with and without the exemption knows what a change of plan would cost, which is worth knowing before circumstances change. Other cost lines that are routinely left out of early appraisals are set out in the notes on utility connection costs and on the cost of retrospective development.

If you are pricing the document side of a self build rather than the levy, see PlanScope pricing for one free report, £50 per report, or Professional for unlimited reports.

This is general guidance, not legal advice; check the current text of the Regulations and 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.