Most major works disputes in blocks follow the same script. The bill lands, leaseholders say they were never properly consulted, and the landlord discovers that recovery is capped at £250 per flat regardless of what the scaffolding actually cost. A section 20 consultation is the statutory process standing between a full roof replacement and an unrecoverable write-off, and it is unforgiving by design: the requirements are procedural, the clocks are fixed, and no tribunal will retrospectively fix a notice you forgot to send. This guide covers what triggers consultation, the notice stages in order, the timing traps that catch experienced managers, and when it is worth applying for dispensation.
What triggers a section 20 consultation
The duty sits in section 20 of the Landlord and Tenant Act 1985, as amended by the Commonhold and Leasehold Reform Act 2002, with the mechanics in the 2003 consultation regulations. It applies in England and Wales. Scotland and Northern Ireland run entirely different regimes, so do not lift an English process note across the border.
A section 20 consultation is triggered in one of two ways.
Qualifying works
Works to the building or other premises where the contribution from any one leaseholder would exceed £250. Read that carefully, because it is the most common early mistake: the test is per leaseholder, not the total contract value and not an average. In a block with uneven apportionments, the flat with the largest percentage sets the trigger. Works also cannot be artificially sliced into phases to duck the threshold. A tribunal will look at whether the works were in substance one scheme.
Qualifying long-term agreements
Any agreement longer than 12 months where any one leaseholder's contribution exceeds £100 in an accounting year. Lift maintenance, communal cleaning, grounds maintenance, door entry and fire alarm servicing contracts routinely qualify. Where works are later carried out under a QLTA that was itself properly consulted on, a shorter procedure applies to those works rather than the full route. Public sector landlords who must advertise the contract follow a different schedule again.
The three stages of a section 20 consultation
For most private blocks, where the works are not under a QLTA and no public notice is required, the process runs in three stages.
Stage 1: notice of intention
Serve on every leaseholder and on any recognised tenants' association. It must:
- describe the proposed works in general terms, or state where and when a description can be inspected free of charge
- explain why the works are considered necessary
- invite written observations within 30 days, giving the address for them and the date the period ends
- invite leaseholders to nominate a contractor from whom you should try to obtain an estimate
The nomination invitation is not optional garnish. Omitting it is one of the cleanest ways to invalidate an otherwise diligent process.
Stage 2: statement of estimates
Obtain at least two estimates, and at least one must come from a contractor wholly unconnected with the landlord. Handle nominations properly: where a single contractor is nominated you must try to obtain an estimate from them, and where several are nominated you must approach at least two. Having tried and failed is defensible, not having bothered is not, so keep the emails.
The statement must set out at least two of the estimated amounts, summarise the observations received at stage 1 alongside your responses, and say where all estimates can be inspected. Then run a second 30-day observation period.
Stage 3: notice of reasons
Within 21 days of entering the contract, tell leaseholders why you chose that contractor and summarise any stage 2 observations and your responses. You can skip this notice if you awarded to the lowest estimate or to a leaseholder nominee, which is a quiet argument for doing one of those two things.
Timing traps in a section 20 consultation
Most failed consultations are not failures of intent. They are calendar errors.
- Counting 30 days from the wrong date. The period runs from service, not from the day you printed the notices. Build in deemed service and post early.
- Committing before the clock stops. Signing a letter of intent, ordering scaffolding or letting a contractor start before the stage 2 period closes undermines the whole exercise.
- Inspection arrangements that do not work. If you state an address and reasonable hours, they must be real, and copies must be available free on request.
- Scope drift after stage 2. If opening up reveals structural work that was never described, expect to consult again on the new element.
- Forgetting section 20B. Costs incurred more than 18 months before a demand are not recoverable unless you served a written notice of those costs in the meantime. On long programmes this bites independently of section 20.
- Assuming reserve funds remove the duty. Money already collected does not exempt works from consultation.
Keep a consultation file per scheme: notices, proof of posting, observations received, your written responses and every date. Service charge rules are still being reformed under the Leasehold and Freehold Reform Act 2024, so check the current position before relying on an old precedent pack rather than assuming last year's template is still right. More block management walkthroughs sit on the PlanaJob blog.
Collecting comparable quotes
Two estimates are the legal minimum, not a procurement strategy. The estimates stage only does its job if leaseholders can compare like with like, which requires every contractor to have priced the same job.
- Write the specification before you go to market. For roofs, structure, fire doors or anything needing design, instruct a surveyor and tender against their spec.
- Define prelims, access, working hours, welfare and waste explicitly. Scaffolding assumptions are where comparable quotes quietly stop being comparable.
- Give everyone the same provisional sums and contingency treatment.
- Ask for the same programme, so leaseholders can weigh duration against price.
- Allow realistic estimating time. Rushed pricing comes back loaded with risk, a dynamic covered well on Construction Arbitrage.
Contractors also talk to each other about which agents run a tidy tender and which waste three weeks of estimating time, and UK trade communities such as Contractor Club are full of those conversations. A clean brief is a commercial asset, not just a compliance one.
That is the practical case for running your section 20 consultation through a platform rather than a mailbox. Platforms like PlanaJob let property managers compare quotes from vetted contractors against a single scope, with a record of who was invited, what they were sent and what they returned held in one place, which is precisely the evidence a tribunal asks to see. You can create an account in a few minutes, or read how PlanaJob works for property managers across multi-block portfolios.
When to apply for dispensation
If your section 20 consultation has gone wrong, or the roof came off in a storm and consulting first was never realistic, apply to the First-tier Tribunal (Property Chamber) in England, or the Leasehold Valuation Tribunal in Wales, for dispensation under section 20ZA. The Supreme Court in Daejan Investments v Benson reframed the test around prejudice: what did leaseholders actually lose because of the failure. Dispensation is frequently granted, but often with conditions attached, including paying leaseholders' costs and reducing the charge to reflect real prejudice.
Two working rules. Apply as soon as you know there is a problem, not after the demands have gone out. And keep emergency works genuinely limited: make the building safe, then consult properly on the permanent repair.
FAQ
Does a section 20 consultation force me to accept the cheapest quote?
No. You must consider observations and give reasons, but you can appoint a more expensive contractor where there is a defensible basis such as programme, competence or fire safety credentials. Remember that awarding to the lowest estimate or to a leaseholder nominee removes the stage 3 notice requirement, and that costs must still be reasonable and works carried out to a reasonable standard.
What happens if I miss a stage?
Contributions are capped at £250 per leaseholder for the works, or £100 per year for a qualifying long-term agreement, unless the tribunal grants dispensation. The cap applies to the scheme as a whole, so one missed notice on a large project is a serious exposure rather than a technicality.
Do I need to consult for emergency repairs?
The duty does not vanish, but urgency is exactly what dispensation exists for. Make the building safe, document why waiting was not an option, tell leaseholders what you did and why as soon as you can, then apply for dispensation on the emergency element while consulting normally on any follow-on works.