What Section 20 major works really cost a leaseholder
External and facade works are one of the commonest triggers of a Section 20 consultation, and the hardest cost for a leaseholder or a managing agent to see coming. This is a free, sourced reference on what they actually cost, set against the threshold that is meant to protect you.
The Section 20 consultation threshold is £250 per leaseholder. Yet councils have issued external works estimates of up to £95,000 per flat, up to 380 times the figure that triggers a single consultation letter, with the largest struck down only on appeal.
Figures are assembled from named public sources, listed in full below. This page carries no estimate that is not traceable to a cited source.
The cost of external major works, by works type
Per leaseholder, indicative ranges from published lifecycle costing and trade cost guides. Log scale.
The single most useful thing to understand about these figures is why they spread so widely. It is not floor area. It is access. Reaching a facade by a long term scaffold is far more expensive and far slower than rope access or a single mobilisation, and the method is dictated by the building, not chosen from a price list. A stalled scaffold is the difference between a routine redecoration and a five figure bill. One east London block below ran for five years behind scaffolding before its consultation notice even landed, and another reached the Court of Appeal.
How Section 20 works, in plain terms
The process that governs every one of the bills above.
Section 20 of the Landlord and Tenant Act 1985 controls how a landlord recovers the cost of major works through the service charge. The rule that matters: if qualifying works will cost any single leaseholder more than £250, the landlord must run a formal consultation before doing the work. For a long term agreement, lasting more than twelve months, the trigger is £100 a year.
What happens if the landlord gets it wrong
This is the part leaseholders rarely know. If the consultation is not carried out, and the tribunal does not grant dispensation, the landlord can recover only £250 per leaseholder for that set of works, no matter what the works actually cost. On a £95,000 facade refurbishment, that is the difference between £250 and £95,000 landing on each flat. It is the single strongest protection a leaseholder has, and the single biggest risk a managing agent carries.
The consultation stages
Qualifying works usually run through two or three stages. A notice of intention describing the proposed works, a notice with estimates including at least one from a contractor wholly unconnected to the landlord, and the chance for leaseholders to nominate their own contractor and to make observations the landlord must have regard to. Splitting one job into smaller packages to stay under the threshold is something tribunals take a dim view of.
Dispensation, and challenging the bill
A landlord who could not consult, for genuinely urgent safety works for example, can apply to the First-tier Tribunal for dispensation. The tribunal decides by asking whether the leaseholders would suffer real prejudice from the failure to consult, following the Supreme Court approach in Daejan. Separately, a leaseholder can apply under Section 27A to challenge whether a cost was reasonably incurred and whether the work was to a reasonable standard. Necessary works, properly consulted and reasonably priced, are generally payable.
The case record
Real published external and major works bills per flat. Each row is individually sourced.
| Building / source | Works | Per flat | Note |
|---|---|---|---|
| Brewster House and Malting House, Tower Hamlets (Court of Appeal, December 2025) | Structural and external reinforcement to two 1960s blocks, £9.2m total | up to £95,000 sought | Leaseholders found not liable through the tribunal, Upper Tribunal and Court of Appeal. |
| Old Market Square, Bethnal Green (Tower Hamlets), reported 2024 | External refurbishment, concrete repair, scaffold removal | up to £95,000 estimated | Section 20 notice later withdrawn by the council after costing errors were found. |
| Property Institute Service Charge Index 2026 | Annual service charge, buildings over 18 metres | £4,447 / yr | Repairs and maintenance is the single largest cost category. |
| Enfield Council, published worked example | Communal major works, apportioned by rateable value | £18,527 | Illustrative split of a £221,000 block bill to one flat. |
The Section 20 framework and the per works bands above are stable. The case record is designed to grow: it is being extended with individual First-tier Tribunal service charge decisions, which are published on GOV.UK, each added only once its figure has been read from the decision itself.
Use this reference
This page is published under a Creative Commons Attribution 4.0 licence. You may quote the figures and embed the chart in your own articles and guidance, for free, with attribution to Envelium Research.
Questions leaseholders and agents ask
What is the Section 20 threshold for major works?
A landlord must consult leaseholders when qualifying works will cost any single leaseholder more than 250 pounds. For a long term agreement the trigger is 100 pounds a year. If the consultation is not carried out and the tribunal does not grant dispensation, the landlord can recover only 250 pounds per leaseholder no matter what the works actually cost.
How much do external or facade major works cost per flat?
Published bills vary enormously by building. Routine external redecoration tends to fall around 1,000 to 2,000 pounds per flat, while a full external or facade refurbishment involving render, concrete repair and long term scaffolding reached 18,500 pounds in one council worked example, and a council sought up to 95,000 pounds per flat in one case before the Court of Appeal ruled the leaseholders were not liable. The works type and the access method drive the figure far more than floor area.
Can a leaseholder refuse to pay for major works?
Not simply because the bill is large. A leaseholder can challenge whether the cost was reasonably incurred, whether the work was to a reasonable standard and whether the Section 20 consultation was properly run, by applying to the First-tier Tribunal under Section 27A of the Landlord and Tenant Act 1985. The tribunal can reduce or disallow charges, but necessary works to a reasonable standard, properly consulted, are generally payable.
What happens if the landlord skips the Section 20 consultation?
The recoverable amount is capped at 250 pounds per leaseholder for that set of works, unless the landlord obtains dispensation from the First-tier Tribunal. The tribunal decides dispensation by asking whether the leaseholders would suffer real prejudice from the failure to consult, following the Supreme Court approach in Daejan.
Why is the cost of external works so unpredictable?
Because access usually costs more than the cleaning or repair itself. Reaching a facade by long term scaffold is far more expensive and slower than rope access or a single mobilisation, and the method is set by the building, not by a price list. This is also why a fixed scope and a fixed price, agreed before work starts, protect leaseholders from open ended bills.
Sources and method
Every figure on this page traces to one of these.
- Landlord and Tenant Act 1985, Section 20 and Section 20ZA, and the consultation regulations. The £250 and £100 thresholds and the consultation stages. legislation.gov.uk
- GOV.UK, Service charges and other issues in the property tribunal (T541), confirming First-tier Tribunal decisions are published on GOV.UK. gov.uk
- The Property Institute, Service Charge Index 2026. Average £2,880 per leaseholder, £4,447 for buildings over 18 metres, from 2,137 estates and 117,052 leasehold homes. tpi.org.uk
- Tower Hamlets v Various Leaseholders of Brewster House and Malting House, Court of Appeal, December 2025. Council sought up to £95,000 per flat for £9.2m structural works; leaseholders found not liable. Reported by Estates Gazette and Local Government Lawyer.
- BBC News, leaseholders told they face external refurbishment estimates of up to £95,000 each, Old Market Square, Tower Hamlets, 2024. The notice was subsequently withdrawn. bbc.co.uk
- Enfield Council, major works charges for leaseholders, illustrative worked example of per flat apportionment. enfield.gov.uk
- Daejan Investments Ltd v Benson, on the test for dispensation from consultation. Supreme Court, 2013.
The per works bands are indicative ranges drawn from published trade cost guides and lifecycle costing, offered for orientation, not a proprietary average. The statutory thresholds, the case record figures and the Property Institute figures are each traceable to the named source above.