Give the AI a one-page fact sheet about your site, ask it to draft one clause at a time in short sentences, then send the draft to a solicitor with a list of the risky clauses: liability, insurance, fees, entry rights and anything about selling goods, which the AI should never write.
Blank templates tell you what to cover but not how to say it so a customer can follow it. AI is good at the second job and unreliable at the first: it does not know which rules on fees, notices or deposits apply where you operate, so it fills gaps with confident guesses. Keep its job to wording, and keep policy and law with you and your solicitor.
Write the fact sheet first so the AI has nothing to invent
The most common failure is a one-line prompt such as "write a storage unit rental agreement". The model then supplies policies you never chose: round-the-clock access, a generous grace period, an insurance rule borrowed from some other site. Decide the policy first and put it on a fact sheet. Anything you have not decided gets the words TO CONFIRM, and the AI is told to repeat that flag in the draft instead of filling the gap.
Here is a filled-in sheet for an illustrative single-site operator with 90 units on month-to-month terms.
SITE FACT SHEET (illustrative: one site, 90 units, month-to-month)
Operator: [company name], trading as [site name]
Units: small, medium and large; unit numbers on the plan
Rent: due on the 1st; paid by card or bank debit; reminder email 3 days before
Term: month-to-month; either side ends it with 14 days' written notice (email counts)
Move-in costs: admin fee $20; padlock $12 (optional); no deposit
Late fee: flat $15 once rent is 5 days overdue; returned payment fee $10
Rent changes: 30 days' notice by email
Access: gate open 6am-10pm daily; code is personal; no overnight access; staff on site 9am-5pm
Operator entry: only with notice, except emergencies (fire, flood, alarm, break-in)
Insurance: customer insures own goods; our policy covers the building only
Prohibited: hazardous or flammable materials, food, animals, living in the unit, anything illegal
Customer duties: keep the unit clean, report damage, keep contact details current
Unpaid rent and goods left in the unit: RESERVED FOR SOLICITOR (do not draft)
Governing law and disputes: TO CONFIRM
Expect the first sheet to take about an hour, mostly spent on questions you have never written down: when exactly rent counts as late, who may enter a unit and when, and who insures what. That hour is the real work. It is also the page your solicitor will value most, because it shows what you intend before they see how a machine phrased it. The same sheet can later feed a unit-size chatbot for your website, so the website and the agreement never disagree.
One clause at a time: a prompt and the output to mark up
Ask for one clause per request. A whole agreement in one go produces a smooth document in which a wrong number hides between two correct ones; a single clause is short enough to check line by line. This prompt drafts the access clause from the sheet above.
You are drafting one clause of a storage unit rental agreement for a self-storage operator.
Use only the facts in the fact sheet below. If a fact is missing or marked TO CONFIRM,
write [TO CONFIRM: what is needed] in the draft. Never invent a number, a period of time,
a fee, a legal right or a law.
Write for a reader with no legal background: short sentences, "we" for the operator and
"you" for the customer, one idea per sentence, no Latin, no "hereinafter".
Draft ONLY clause 3, "Getting into the site". Number the sub-clauses.
Do not draft anything about selling, auctioning or disposing of goods.
After the clause, list every assumption you made, one line each.
[paste the fact sheet here]
Output of roughly this shape is what you should expect back (illustrative).
3. Getting into the site
3.1 The gate is open from 6am to 10pm every day, including public holidays. You cannot get in outside those hours.
3.2 You get your own gate code. It is personal to you. Do not share it or let anyone else use it. If you think someone else knows it, tell us straight away and we will change it.
3.3 You can bring helpers or visitors, but you stay responsible for what they do.
3.4 We may close the gate or part of the site briefly for safety, repairs or an emergency. We will tell you in advance where we can.
3.5 We may stop your access if your rent is more than [TO CONFIRM: number of days] days overdue. We will email you first.
Assumptions I made:
- "Every day" includes public holidays.
- "Visitors" means anyone you bring onto the site.
- Staff hours are information only, so they are not in the clause.
Three edits before this clause goes anywhere. First, 3.1 quietly decided that public holidays are covered; the assumptions list is where it admitted that, so check it against how you really run the gate. Second, 3.4 says "briefly" and "where we can", words a customer cannot hold you to and you cannot rely on. Replace them with a number you have chosen, such as an email at least 48 hours before a planned closure. Third, 3.5 is the model wandering: refusing entry for unpaid rent was not on the fact sheet. It flagged the gap properly, which is the behaviour you want, but the whole sub-clause comes out and goes onto the solicitor list, because stopping access to someone's belongings carries consequences you should not guess at.
Repeat for each clause: parties and unit, term and ending, rent and fees, access, entry by you, what may not be stored, insurance, customer duties, rule changes. Nine short prompts take less time than one long one, and every output gets its own assumptions list.
Plain English can change the legal meaning: rewrites to check
Shorter sentences are the point of this exercise, but simplifying is not always neutral. A formal clause may carry a precise legal effect that the friendly version drops without anyone noticing. The table shows four rewrites of the kind an AI produces, and what a solicitor should confirm about each.
| Formal wording | Plain-English version | What the solicitor confirms |
|---|---|---|
| "The Owner may enter the Unit at any time without notice for any purpose it deems necessary." | "We will not go into your unit without telling you first. In an emergency such as fire, flood or an alarm we may open it straight away and will tell you afterwards." | That the narrower right still covers inspections and pest control, and that an email counts as notice. |
| "The Occupier shall remit payment on or before the first day of each calendar month." | "Rent is due on the 1st of every month." | Almost nothing. This one is a safe simplification. |
| "The Occupier shall indemnify the Owner against all claims arising from the Occupier's use of the Unit." | "If what you store, or someone you bring, damages the site or hurts someone, you are responsible for the cost." | Whether the plain version has the same legal effect. Indemnities are where simplifying changes meaning most often. |
| "This Agreement shall continue until terminated in accordance with clause 12." | "This agreement runs month to month until you or we end it. Either of us can end it with 14 days' notice by email." | The notice period, how notice must be delivered, and whether you need a longer period than the customer. |
A second AI pass helps you find those differences, though it does not settle them. Paste both versions and ask for the gaps.
Compare the formal clause and the plain-English clause below.
List every way the plain version differs in legal effect: rights dropped, duties added,
conditions lost, wording that is vaguer or stricter. Do not give legal advice and do not
say which version is better. Output a table: difference, which side it favours.
Treat the answer as a question list for your solicitor, not as a verdict. The model can spot that "you are responsible for the cost" is broader than "indemnify against claims", but it cannot tell you which of the two a court where you operate would enforce.
Insurance wording: who covers what, and who is told
Insurance is where a rewrite is most tempting and most dangerous, because a sentence like "your goods are protected" sounds helpful and may promise something your policy never offered. Start by choosing which of three models you actually run.
| Model | Draft wording (placeholders in brackets) | Ask the solicitor |
|---|---|---|
| Customer insures their own goods | "We do not insure what you store. You must insure your goods for their full value while they are in the unit and show us proof if we ask. Our insurance covers the building only." | Whether you may require cover, and what follows if a customer has none. |
| You sell a protection plan | "You can add our protection plan for $[amount] a month. It covers [summary copied from the plan document] up to $[limit]. If this agreement and the plan document disagree, the plan document decides any claim." | Whether selling or arranging a plan carries its own authorisation rules, and how losses outside the plan are described. |
| Either, at the customer's choice | "You choose: our protection plan or your own insurance. Either way, you must have cover from the day you move in." | Whether a customer who declines both is accepted, and what they sign to say so. |
Never let the AI summarise what a protection plan covers from memory. Paste the provider's own wording and tell the model to quote the cover, the limit and the exclusions rather than describe them. A realistic mistake (illustrative): a draft says "your goods are covered up to $5,000 while in the unit". The figure is a guess borrowed from templates the model has seen, and the operator's policy says nothing of the sort. The catch is mechanical. Search the draft for covered, insured, protected, safe, secure and guaranteed. Every hit needs a source in your own policy documents; otherwise it becomes a duty on the customer or it goes.
How far you may limit your liability for loss, theft or damage is the single most important question in this clause, and the one AI should not answer. Put a placeholder in the draft, [LIABILITY CLAUSE: SOLICITOR TO WRITE], and spend your solicitor's time there. If you ask for proof of cover, record each customer's renewal date at move-in, so that a lapse is caught by a reminder rather than by a claim.
Late fees and rent changes: fix the numbers before the words
Fees cause more arguments than any other clause, and nearly always because the date, the amount or the repetition was vague. Settle the numbers first, keep every charge in one table, and have the clauses point to it. This is the table for the illustrative site.
| Fee | Amount | When it applies | Clause that refers to it |
|---|---|---|---|
| Admin fee | $20 | Once, at move-in | 2 (Rent and fees) |
| Padlock | $12 | Only if the customer wants ours | 2 |
| Late fee | $15 | Rent 5 days overdue; once per missed payment | 4 (If you pay late) |
| Returned payment fee | $10 | When a payment bounces | 4 |
| Clean-out fee | $40 | Unit left with items inside or not swept | 9 (When you leave) |
A quick sum shows what the late fee is for. On 90 units, if six to eight tenants pay late in a typical month, a flat $15 fee brings in $90 to $120 (illustrative figures). It will not fund anything. Its job is to make the due date matter and to tell the customer, in writing, what a missed payment costs. Chasing costs you far more in time than the fee returns, which is why the reminder message deserves as much care as the clause; the tutorial on chasing late payments with AI reminders covers that wording.
Here is the clause as a template often words it, and as it reads once the numbers are fixed.
- Before: "Late charges may be assessed at the maximum rate permitted by applicable law."
- After: "If your rent is still unpaid 5 days after the due date, we add a $15 late fee. We add it once for each missed payment, not every day."
Two cautions. Some places cap late fees or require a grace period, so the solicitor confirms both the amount and the timing. And "once per missed payment" is a policy choice. If you would rather charge a percentage, or stop at a warning, say so on the fact sheet; the AI cannot choose for you.
Rent changes need the same treatment. A workable plain version reads: "We can change your rent by emailing you at least 30 days before the new rent starts. If you do not want to pay the new rent, tell us before then and we will end your agreement on the day it would have started." The second sentence is generous and is yours to keep or drop. For the notice letters themselves, rent-change and renewal letters drafted with AI is a useful companion.
The lien and sale clause: leave it blank for your solicitor
Every operator wants a right to deal with goods when rent stops. That is exactly why the AI must not draft it. The steps, notice periods, wording of letters and handling of any sale proceeds are set by law where you operate, they differ between places, and a wrong step can turn a debt recovery into a claim against you. A model will happily produce something fluent and confident, which is the danger. This section, along with notice letters about sale or disposal, belongs to a lawyer from the first word.
In the prompt, say so twice: once in the instructions and once by leaving a visible placeholder in the document.
12. If rent is not paid
12.1 [RESERVED: clause on unpaid rent, restricting access, and goods left in the unit.
To be written by our solicitor. Do not draft, summarise or paraphrase.]
Models do not always obey, so check. An illustrative failure: the AI slips in the sentence "If rent is 30 days late we may sell your goods without further notice." A sentence like that is one a solicitor will strike entirely, and it could do real harm if it went out unnoticed. Search every draft for sell, sale, auction, lien, dispose, abandon, overlock, cut the lock, lockout, seize and "keep your goods". Any hit outside the reserved placeholder is deleted and raised with your solicitor.
Ten-minute tests that show whether a customer can follow it
Plain English is a claim you can test. Start with the machine check: Word reports reading ease and grade level, and Microsoft's guidance on readability statistics says to aim for a Flesch Reading Ease between 60 and 70 and a grade level of about 7 to 8 for most documents. In Microsoft 365 on the Current Channel, the route is the Home tab, Editor, then Document stats; older versions show the figures at the end of a spelling and grammar check once "Show readability statistics" is ticked in the proofing options. A storage agreement will rarely hit those figures in every clause, so use the score to find the worst paragraphs rather than to chase a number. The plain-English and readability tutorial goes further on the method.
Then use people. Give the draft to three readers who have not seen it, with no explanation, and ask the eight questions below. They answer from the document alone.
| Question for the reader | Where the answer sits | Right answer (from the fact sheet) |
|---|---|---|
| When is rent due? | Key facts box | The 1st of every month |
| What happens if I pay late? | Clause 4 | A $15 fee, once, after 5 days |
| How do I end the agreement? | Clause 11 | 14 days' notice; email counts |
| Can I store paint and gas cylinders? | Clause 6 | No: hazardous and flammable items are banned |
| Who insures my goods? | Clause 7 | You do; our insurance covers the building only |
| When can I get in? | Clause 3 | 6am to 10pm, daily |
| Can the manager open my unit without telling me? | Clause 5 | Only in an emergency, and we tell you afterwards |
| What if you raise my rent? | Clause 4 | 30 days' email notice first |
A sensible pass mark is all three readers getting at least seven of eight right, finding each answer within a minute. If two readers miss the same question, the clause is the problem, not the readers; rewrite it and test it on someone new. Each reader sees the draft once, because a second look is not a fair test.
The list to send your solicitor with the draft
A solicitor charges for time, and a focused brief saves it. Send the fact sheet, the draft with the AI's assumptions left in, the clauses you reserved, and two lines about who your customers are: mostly individuals or businesses, and how long they typically stay. Ask for changes in tracked form with a plain-English reason beside each. Then add these questions. They are prompts for the conversation, not legal conclusions.
| Ask about | The question |
|---|---|
| Status | Is this arrangement a lease, a licence or something else where we operate, and what does that change for notices, entry and ending it? |
| Fees | Are the late, admin, returned-payment and clean-out fees allowed, capped, or tied to a grace period? |
| Deposits | If we take one, how must it be held, itemised and returned? |
| Liability | How far can we limit responsibility for loss, theft or damage, and how must the wording be shown to customers? |
| Insurance | Can we require cover? Does selling a protection plan need authorisation? |
| Entry by us | What notice must we give, what emergencies justify immediate entry, and is email notice valid? |
| Stopping access | When and how may we stop access for unpaid rent or a breach? |
| Changes to the deal | What notice and consent rules apply to rent increases and rule changes? |
| Consumer rules | If we rent to individuals, could any clause be treated as unfair? |
| Two customer types | Can one agreement serve both individuals and businesses? |
| Privacy and cameras | What must the notice say about gate logs, CCTV and payment data? |
| E-signing and records | Are electronic signatures and email notices valid, and how long do we keep signed copies? |
| The reserved clause | Please draft the unpaid-rent and goods-left-behind section from scratch. |
| Borrowed wording | Does anything read as if it came from a template written for another place? |
Property leases carry a longer version of this list, which the tutorial on whether ChatGPT can write a lease agreement walks through. Borrow from it if your units are rented on longer terms or for business use.
Freeze the approved text and fill only the blanks
Once the solicitor signs off, the wording stops being something the AI works on. The approved master becomes a fixed file with version number 1.0 and a short change log. For each customer, only the blanks change: name, unit number, rent, start date, padlock choice. Fill those from your own records, either by hand or with a tool that merges fields into a template; generating client contracts from one template covers how.
Set three rules and write them down. Any edit that touches liability, fees, entry, access, insurance or ending the agreement goes back to the solicitor before it is used. Any other edit gets a new version number and a line in the log. And every signed agreement records the version it used, so you always know which words a customer agreed to, including customers who sign online late at night.
Review once a year and after any change to your insurance, gate technology or fees. The fact sheet is where each review starts: update it, then re-run only the clauses that changed.
Where an AI-drafted storage agreement quietly goes wrong
These are the failures worth hunting for, with the way to catch each one.
- Invented numbers. A grace period, a notice length or an insurance limit that appears on no source. Catch it by asking the AI for a table of every number, period and fee with its clause reference, then comparing it with the fact sheet line by line.
- Wording from another place. Phrases such as "pursuant to the statutes" or references to a named statute signal a template written elsewhere. Delete them and ask the solicitor.
- Numbers that disagree. The late fee is 5 days in the key facts box and 7 days in clause 4. The fee table above exists to prevent that.
- Duties on the wrong side. The draft makes customers responsible for a gate fault or a lighting failure that only you can fix.
- Promises of safety. "Secure", "guaranteed" and "monitored 24 hours" create expectations you may not meet. Search for them as you did for insurance words.
- Drift on a later pass. You ask the AI to "tidy" an approved clause and it changes a number. After approval, the AI never touches the text.
The number audit is the most useful check, and it takes two minutes. This is the prompt, followed by a result with one planted fault.
Read the agreement below. Produce a table of every number, time period, fee and date,
with the clause it appears in and the exact words around it. Then list any value that
appears twice with different numbers. Do not correct anything.
Late fee | $15 | clause 4.2 | "we add a $15 late fee"
Late fee trigger | 5 days | key facts box | "rent is late after 5 days"
Late fee trigger | 7 days | clause 4.2 | "7 days after the due date"
Conflict: late-fee trigger is 5 days in the key facts box and 7 days in clause 4.2.
Fix the conflict at the source, the fact sheet, then re-draft the clause rather than patching one sentence. A patched sentence is how the two numbers drifted apart in the first place.
Questions storage operators ask before using an AI-drafted agreement
Can I give customers the AI draft before a solicitor has seen it?
No. Treat the draft as a proposal. Fees, liability statements, insurance wording and entry rights can be unenforceable, or worse, if they are phrased wrongly where you operate, and the AI cannot tell you which ones. Send it with the fact sheet and the reserved clauses, and let nobody sign until you hold approved text.
Is a storage agreement a lease or a licence?
That is a question for your solicitor, and the answer differs between places. The label affects how notices, entry and ending the agreement work. Put it first on the solicitor list, with a plain description of how customers use the space: their own padlock, exclusive use, no right to live there. Do not let the AI pick a label.
Can I paste a customer's details into the chat to prepare their agreement?
Do not. The drafting stage needs only your site's rules. Names, addresses and unit numbers belong in the approved template, filled in later from your own records. If a chat tool will ever sit near customer data, use a business plan and check its training and retention settings before anyone types anything in.
What about customers who signed an older version?
Do not assume the new wording applies to them. Whether existing customers can be moved to new terms, and with what notice or consent, is a question for your solicitor. Until you have the answer, keep the old version on file for them, record which version each customer signed, and use the new text for new rentals only.
Further reads
- AI Call Centre for Self Storage: Can It Rent a Unit After Hours? — Rent units after hours, with the same approved text at signing.
- Compliance Calendar: Track Licences, Insurance and Certificates — Keep your own insurance and licence renewals from slipping.
- Can AI Draft a Barber Chair Rental Agreement? What to Check — Another space-rental agreement, with its own list of terms to check.
- Horse Livery Agreement: Full, Part and DIY Terms Drafted With AI — A four-stage method for drafting a livery agreement with AI: a duties schedule for each livery type, clause prompts, a gap check and a solicitor brief.
- Can AI Draft a Moving Company Contract? Liability and Cancellation — Draft a moving company contract with AI, then test the liability cap, cancellation fees, access clause and claims window against your insurance and a solicitor.
- AI Tools and AI Development: The Complete 2026 Guide — the AI hub, including every tutorial in the AI-for-business series.
Sources: Microsoft Support guidance on readability statistics in Word; published storage agreement templates and drafting guides, read for clause coverage only and not copied.