Which one actually protects you?
Most pages on this topic are written by brokers selling indemnity. We're not one. Here's the honest comparison, including when indemnity is the right call.
The one-line difference
A Lawful Development Certificate resolves the question. The council writes you a document that says the development is lawful. You own that document forever; it transfers with the property; any future buyer's solicitor can read it and move on.
Planning indemnity insurance insures the consequences of the question. An insurer agrees to pay out if the council takes enforcement action against the unauthorised work. The underlying lawfulness question stays open. Next buyer's solicitor asks the same thing, and the next owner pays for indemnity again.
Which one is right for you depends on timing, price sensitivity, and, crucially, what your buyer's solicitor will accept.
Side by side
| Lawful Development Certificate | Planning Indemnity Insurance | |
|---|---|---|
| Resolves lawfulness? | Yes, council writes it down | No, insures consequences only |
| Transfers to future buyers? | Yes, permanently | One-shot; next buyer starts over |
| Cost | £623 (proposed) or £897 (retrospective) all-in with LDC Express for an extension or loft; £485 or £621 for an outbuilding | £20–£300 typically |
| Turnaround | 8–12 weeks (council decision) | Same day |
| Covers known enforcement? | N/A, but resolves the issue | No, most policies exclude known enforcement |
| Accepted by all buyer's solicitors? | Yes | Usually, but not always |
| If the work is recent | s.192 before you build; s.191 on the "it was permitted development" argument needs no waiting period | Some insurers decline or surcharge |
You can't do both, and the order is one-way
This is the part the comparison articles leave out. Nearly every planning indemnity policy carries a condition that the owner has never approached the council about the work. Applying for a Lawful Development Certificate is an approach to the council. So indemnity first then an LDC later is fine; an LDC first then indemnity later is normally not, because once the application is filed the insurer's condition is broken, whether the council grants or refuses.
For a strong case that's a good trade: the certificate settles the question permanently and indemnity never has to exist. For a weak or uncertain case, mid-sale, with indemnity still available, it's a real risk: a refusal costs you the council fee, roughly eight weeks, and the insurance option you had at the start. We won't take that case, and our intake form screens for it.
When indemnity is the right call
- You're exchanging in less than 4 weeks and can't push the date.
- The buyer's solicitor has explicitly said "indemnity is fine". Don't overspend if they've already blessed the cheap path.
- The underlying development is almost certainly lawful but you don't have time to prove it with an LDC. Indemnity here is cheap peace-of-mind, and the risk the policy has to pay out is low.
- You don't plan to sell again for decades and the next owner can fight their own battle.
When an LDC is the right call
- The buyer's solicitor has specifically asked for an LDC and will not accept indemnity. This is common with higher-value property transactions and with certain conveyancing firms.
- There has been any previous council contact about the development, a warning letter, a visit, an informal "we noticed your extension". Indemnity almost always excludes known enforcement; an LDC resolves it permanently.
- You expect to sell again within 10 years. Every future sale asks the same question. An LDC is a one-time fix; indemnity is a recurring cost.
- The property is higher-value and the buyer's lender is strict. Larger mortgages come with tougher requirements; indemnity gets rejected at ~3× the rate on these.
- You want to refinance. Lender checks re-surface the same question every time.
The honest cost stack
People look at £20 indemnity next to a £623 LDC and think the choice is obvious. It isn't. The fair comparison is:
- Indemnity at sale 1: £150. At sale 2: £180. At sale 3: £220. Plus the small but non-zero risk that one of those buyer's solicitors rejects indemnity and you have to get an LDC anyway, from under time pressure, at £623 or more.
- LDC once: £623, or £897 retrospective, for an extension or loft. Transferable forever. No recurring cost, no risk of a future rejection.
If you're a long-term owner or sell within a decade, the LDC is cheaper over the lifetime of the property. If you're about to sell and never selling again, indemnity wins on pure cost.
What we'd do in different scenarios
- Sale in 10 weeks, no council contact, work done 2019: Start the LDC today. Plenty of time. Settles it permanently.
- Sale in 3 weeks, no council contact: Indemnity. You don't have time for an LDC. Ask the buyer's solicitor upfront, and take the policy out before anyone approaches the council.
- Sale in 6 weeks, but the council sent a letter about the extension last year: LDC or renegotiate completion. Indemnity won't cover known enforcement.
- Not selling, planning to build something next year: s.192 LDC before you build. £623 is cheap insurance against a refused retrospective application later.