Part of: UK Council Tax 2026 — Complete Guide → Council Tax Appeal 2026 — Challenge Your Band, Bill, or Charge
TL;DR: When a local council issues a completion notice for a new build, setting the date from which Council Tax applies, the developer or buyer can appeal to the Valuation Tribunal England within 4 weeks. This 4-week window is significantly shorter than the 3-month window for band appeals. Completion notice disputes typically turn on whether the property was "substantially complete" on the date specified. The Valuation Office (formerly VOA, now part of HMRC since 1 April 2026) then assigns a band once the notice is accepted.
Last reviewed: 27 April 2026
What a Completion Notice Is
Under section 17 and Schedule 4A of the Local Government Finance Act 1992, when a local planning authority determines that a new dwelling is substantially complete, it issues a "completion notice." This notice specifies the date from which the property is treated as a dwelling for Council Tax purposes - the date on which Council Tax liability begins.
The completion notice is issued by the local billing council (not by the Valuation Office). After the completion notice date, the Valuation Office (formerly VOA, now part of HMRC since 1 April 2026) then assesses the property and assigns a Council Tax band.
The Building Act 1984 governs building control and the completion certificate process, which typically triggers the completion notice.
How Completion Notice Disputes Arise
Developer disputes the completion date: The billing council says the development is substantially complete from a specific date, but the developer argues that significant works remain outstanding. The developer may be liable for Council Tax on unsold units from the completion date - a meaningful financial impact on large developments.
Buyer disputes the completion date: A buyer completes their purchase but argues that the completion notice date used to backdate Council Tax liability was earlier than it should have been. The buyer may be billed from a date before they occupied the property.
Renovation returning to use: Where a long-empty property is renovated and returns to habitable use, the council may issue a completion notice when it considers the property substantially complete. The owner may argue the property was not yet complete.
Partially complete development: On a large multi-unit development, completion notices may be issued for individual units as they are completed. Disputes about individual unit completion dates are common.
The "Substantially Complete" Test
The test for completion notice purposes is not "fully finished" but "substantially complete" - capable of occupation as a dwelling even if minor finishing work remains. The Council Tax (Alteration of Lists and Appeals) (England) Regulations 2009 and related case law have clarified this:
- A property is substantially complete when it is habitable - when a person could reasonably occupy it as a dwelling, even if decorating, minor fixtures, or garden work remains.
- It is not complete simply because building control has inspected; completion can occur before or after formal building control sign-off.
- For new-build developments, unit completion is assessed individually.
The 4-Week Appeal Window
Critical difference from band appeals: Completion notice appeals must be submitted within 4 weeks of receiving the completion notice. This is significantly shorter than the 3-month window for band or bill appeals.
If you receive a completion notice and believe the completion date is wrong, act within 4 weeks. Submit an appeal to the Valuation Tribunal England through valuationtribunal.gov.uk.
Evidence to include:
- Building control status at the completion date specified in the notice
- Photos showing works in progress at that date
- Contractor confirmation of outstanding works
- Occupation status at that date
The Interaction with Valuation Office Banding
The completion notice and the Council Tax band are two separate things:
1. The billing council issues the completion notice, setting the start date for Council Tax liability.
2. The Valuation Office (formerly VOA, now part of HMRC since 1 April 2026) assesses the property and assigns a band - typically 30 to 90 days after the completion notice triggers Council Tax liability.
Disputing the completion notice date is separate from challenging the Council Tax band. A buyer could simultaneously dispute the completion notice date (through the VTE) and challenge the assigned band (through a Valuation Office proposal within the 6-month new-owner window).
Understanding the "Substantially Complete" Test in Practice
The test for whether a property is substantially complete for completion notice purposes is not as straightforward as it might appear. Published case law and tribunal decisions have clarified its application:
The basic standard: A property is substantially complete when it is capable of occupation as a residential dwelling - when a person could reasonably move in and live there, even if finishing works remain. This does not require every item to be complete.
What does NOT prevent substantial completion:
- Decorating (painting, wallpapering)
- Fitting of non-essential fixtures (curtain rails, furniture)
- Garden landscaping
- Minor external finishing work
- Outstanding snagging items that do not affect habitability
What DOES prevent substantial completion:
- Absence of working kitchen facilities
- Absence of working bathroom facilities
- Missing heating system in cold weather conditions
- Structural elements not completed
- Building control sign-off specifically withheld because habitability requirements are not met
The developer's position: Developers often argue that substantial completion has not occurred in order to defer Council Tax liability on unsold units. Billing councils take a pragmatic view: if units are habitable, they are substantially complete.
The Completion Notice and the Building Control Certificate
A completion certificate from building control is not the same as the completion notice for Council Tax purposes. The two are separate:
Building control completion certificate: Issued when building control is satisfied that the works comply with Building Regulations (Building Act 1984). This confirms regulatory compliance, not Council Tax liability.
Council Tax completion notice: Issued by the billing council when it determines the property is substantially complete as a dwelling. This can be issued before or after the building control certificate.
In practice, billing councils often issue completion notices around the time of building control sign-off, but the legal tests are different. A property could theoretically be substantially complete for Council Tax purposes before building control issues its certificate.
Practical Steps on Receiving a Completion Notice You Disagree With
1. Read the notice carefully. Note the date specified as the completion date and the deadline for appeal (4 weeks from receipt).
2. Photograph the property's condition on or around the date specified in the notice. Time-stamped photos are the most useful evidence.
3. Contact the billing council immediately. Some disputes are resolved by the council agreeing to extend or amend the completion date on the basis of photographic evidence and contractor confirmation.
4. Request building control records. Obtain the building control inspection log showing the status of the works at the date specified in the notice.
5. Get written confirmation from contractors of outstanding works at the notice date.
6. Submit a VTE appeal within 4 weeks if the council does not amend the notice. Do not wait for the 4-week window to pass.
How Developers Manage Completion Notices on Large Sites
On large residential developments with multiple phases and hundreds of units, developers actively manage completion notices:
- Site managers maintain records of each unit's completion status
- Solicitors advise on the 4-week appeal window for each unit
- Appeals may be lodged for entire tranches of units where completion dates are disputed
MHCLG guidance notes that billing councils should issue completion notices for individual units as they become substantially complete, not for the development as a whole. This creates an administrative burden on both councils and developers on major schemes.
Welsh and Scottish Procedures
Wales: Welsh billing councils issue completion notices under Welsh legislation. Appeals go to the Valuation Tribunal for Wales. The Welsh Valuation Office (separate from HMRC) assigns bands. The process mirrors England's but uses Welsh institutions.
Scotland: Scottish local councils issue completion notices under Scottish legislation. Appeals go to the Local Valuation Appeal Committee for the relevant area.
Frequently Asked Questions
I received a completion notice but the property was not liveable at the date it specifies - how do I challenge it?
You have 4 weeks from receiving the notice to appeal to the Valuation Tribunal England. Gather evidence immediately: photos dated around the specified completion date showing ongoing works, building control correspondence, and contractor confirmation of outstanding work. Submit the appeal through valuationtribunal.gov.uk.
The completion notice was issued before I bought the property - can I still challenge it?
The completion notice challenge should be made by the person who received the notice (typically the developer or previous owner). If you purchased after the completion notice was issued and the date it specifies affects when your Council Tax liability started, you may challenge the billing period through a bill appeal (billing council under section 16 of the Local Government Finance Act 1992). This is different from a completion notice appeal.
What happens to the completion notice appeal if I have already moved in?
Moving into the property does not prevent you from appealing the completion date if that date was earlier than when the property was substantially complete. However, moving in is evidence that the property was by then habitable. Focus your evidence on the state of the property at the date specified in the completion notice rather than at the date you moved in.
Does the VOA-HMRC merger affect the completion notice process or the 4-week appeal window?
Completion notices are issued by billing councils, not by the Valuation Office. The VOA-HMRC merger on 1 April 2026 therefore has no direct effect on the completion notice process or the 4-week appeal window to the Valuation Tribunal England. The Valuation Office's role begins after the completion notice date is accepted or confirmed - when it assesses and assigns the Council Tax band to the new dwelling.
My new build was completed in phases and each unit received a separate completion notice. One seems too early - can I appeal?
Yes. Each individual completion notice can be separately appealed within the 4-week window from receipt of that specific notice. The appeal for each unit is assessed independently on whether that specific unit was substantially complete at the date specified in that notice.
How we verified this
The completion notice regime is from section 17 and Schedule 4A of the Local Government Finance Act 1992. The Building Act 1984 governs building control and completion certificates. The Council Tax (Alteration of Lists and Appeals) (England) Regulations 2009 provide the 4-week appeal window. The Valuation Tribunal England hears completion notice appeals. The "substantially complete" test has been clarified in Valuation Tribunal and higher court case law. Welsh and Scottish procedures are from the relevant devolved legislation and guidance.
Sources & Verification
- Local Government Finance Act 1992 (s17, Schedule 4A): https://www.legislation.gov.uk/ukpga/1992/14/contents
- Council Tax (Alteration of Lists and Appeals) (England) Regulations 2009: https://www.legislation.gov.uk/uksi/2009/2270/contents
- Building Act 1984: https://www.legislation.gov.uk/ukpga/1984/55/contents
- Valuation Tribunal for England: https://www.valuationtribunal.gov.uk/
- Valuation Office (formerly VOA): https://www.gov.uk/government/organisations/valuation-office-agency
- MHCLG Council Tax guidance: https://www.gov.uk/government/collections/council-tax-statistics
- IRRV (Institute of Revenues, Rating and Valuation): https://www.irrv.net/
This article is for informational purposes only and does not constitute legal, financial, or tax advice. Council Tax rules vary by local authority and change annually. Always verify current rates and rules with your local council and gov.uk before making any decision.
