The variation didn't fail when you sent the invoice. It failed three weeks earlier, on the call where the client said "could we just look at moving the stair" and you said "sure, leave it with me."
That sentence is the whole problem. Free rework is almost never a pricing failure — you know roughly what your time is worth. It's a sequencing failure. By the time the awkwardness of asking for money arrives, you've already done the work, which means you're now asking for payment for something the client has had for free for a fortnight. Nobody wins that conversation.
So break it into the three places it actually goes wrong: detection (you didn't clock it as extra until the time was spent), evidence (your appointment doesn't define the baseline sharply enough to point at), and conversation (you have no script, so you improvise, and improvising while embarrassed produces a discount). Fix them in that order. They're each a different fix.
Variations don't announce themselves. They arrive as questions. "What would it look like if…", "quick thought…", "my wife's mother said…". The request is small, the politeness is high, and the file is already open on your second monitor. Opening the file is the moment you lose the money.
The fix is a trip-wire, not discipline. Before you touch the model, one question: is what's being asked for on the list of things I agreed to produce? Not "is it reasonable" — reasonable and included are different words. If it isn't on the list, nothing happens until it's been written down.
As a rule of thumb we teach, the wire trips at one hour. You're allowed an hour of thinking, a sketch, a phone call — that's relationship maintenance and it's how you work out what they actually mean. Past an hour, it's a service. The cruelty of post-submission changes is that the hour goes nowhere near it: a genuine change to a submitted scheme means revised plans, sections and elevations, a revised site plan, probably a revised design and access statement, a re-run of the submission admin, and a conversation with a case officer who now has two versions of your scheme in their inbox. In practice the drawing is the small half of that.
Failure Two: You Can't Point At Anything
Here's the test. Right now, open the appointment you sent this client. Can you find a sentence that says, in specific terms, what you agreed to produce — by document, by number, by revision? Or does it say something like "prepare and submit a planning application"?
If it's the second one, you haven't got a baseline. You've got a genre. And a variation is defined entirely by its distance from the baseline, so without one you have nothing to measure against and nothing to point at when the client says "I assumed that was included." They're not lying. In the absence of a stated limit, everything is included. That's how the sentence reads to a non-architect.
The RIBA's standard professional services agreements carry a mechanism for changes to the services — go and read the one you used, because the common failure isn't a missing clause, it's a clause that has nothing to bite on. A change-to-services provision only works if the services were described tightly in the first place.
What a usable baseline looks like, in your appointment, in plain words:
The fee for Stage 3 / planning includes: development of two design options to sketch stage and one developed option; one planning submission comprising the drawings listed in the schedule at the revisions issued; and responses to planning officer queries and consultee comments on the submitted scheme. It does not include: changes to the agreed design after issue of the pre-submission drawings for approval; a second or subsequent submission; amendment applications; or design work arising from a change to the brief. Additional services will be confirmed in writing before they are carried out and charged at £— per hour or as a lump sum agreed in advance. Disbursements, including all local authority application fees, are payable by the Client.
Adapt the numbers to how you actually work — the point isn't my numbers, it's that there are numbers. Two options, one submission, one round. The moment a limit is countable, exceeding it is a fact rather than an opinion, and you are no longer arguing about whether you're being fair. You're reading out an arithmetic.
One more line worth having: a client sign-off gate before submission. Issue the final set, ask for written approval, and state that approval fixes the design for the purposes of the application. That signature is what converts "the client changed their mind" from a feeling into a dated event.
Failure Three: You Have No Script, So You Freelance
The conversation goes badly because you're inventing it under pressure, usually while apologising. Replace it with a document you send the same week — ideally the same day — called a variation notice. One page. It is not a negotiation; it is a record with a price on it.
Five parts, in this order:
What was agreed. Name the documents and revisions, and the date they were approved. No commentary.
What's changed, and who asked. Quote the client's own words and date them. "On 14 March you asked whether the stair could be relocated to the rear elevation." Their sentence, not your paraphrase.
What it means for the submitted application. This is the part that makes the charge feel inevitable rather than opportunistic. Set out the route: hold the application and deal with the change by amendment after determination; ask the officer to accept revised drawings mid-determination; withdraw and resubmit; or, post-consent, a non-material amendment under section 96A or a section 73 application to vary the approved-plans condition. Say which you recommend and why, and say what each does to the programme.
Time, fee, assumptions, exclusions. Include the local authority fee as a disbursement, separately identified, payable by them.
The instruction line. "Please confirm by reply and we'll begin on Monday. Until we have your confirmation, the application stands as submitted."
That last line is the entire mechanism. It isn't a threat, it's a statement of fact, and it stops the default behaviour where you do the work while the fee question drifts.
Pricing It: Hours, Lump, or Re-Percentage
Three honest ways to price a post-submission change, and the choice is mostly about how well you can define the end point.
Time charge is right when the change is exploratory — they want to look at three roof forms and don't know which they'll pick. Charge your rate, state an estimate, and tell them you'll stop and check in when you reach it. Never do open-ended time charge without a check-in point; that's how you end up eating the overrun anyway out of guilt.
Lump sum is right when the change is defined, which post-submission it usually is. Price the whole run: redraw, re-coordinate, revise the written material, re-submit, re-validate, and the extra officer contact. Then add a line stating exactly what's assumed — one round of client comment, no change to footprint, no new consultee — because your lump sum is only a lump sum if the scope underneath it is fenced.
Re-percentage only makes sense where the change moves construction value. If the client adds a garden room that wasn't there, the fee for that element can be priced on the same percentage basis as the rest. But be clear-eyed: most post-submission changes cost you a lot of time and add nothing to the build cost, and percentage-of-cost will underpay you savagely on those. Reshaping a roof to satisfy a neighbour is two weeks of your life and zero pounds of extra construction.
Whatever you use, put an expiry on the quote. Something like: priced on the basis of instruction by the 28th, on the current status of the application. It's true — the longer they sit on it, the more the planning position moves under you — and it converts a decision they can defer indefinitely into one with a date on it.
"But You're Just Fixing Your Own Drawings"
This is the line you'll get, and it deserves a straight answer rather than a defensive one, because sometimes it's correct.
Split changes into three buckets and be visibly honest about which one you're in.
Your error. You misread the site levels, you missed a permitted development constraint, the window schedule didn't match the elevations. Absorb it. Do it quickly and say so out loud: "That one's ours, there's no charge." You need that sentence in your history with this client, because it's what makes the other two buckets credible.
The brief changed. They want a different house. Chargeable, always, and the variation notice quoting their own words does the arguing for you.
The authority moved. The officer wants the ridge dropped. A consultee has asked for something nobody could have anticipated. A neighbour objection has produced a design response. This is the bucket everyone absorbs by reflex, and it's the one your appointment should have already dealt with — which is why the wording above includes one round of officer-requested amendments and excludes what comes after. A single round is a normal cost of doing planning work. A conservation officer's third change of mind is not, and it is entirely reasonable to say: this is the fourth revision requested by the authority, the fee covered one, here's what the next one costs.
If they refuse outright, don't escalate and don't sulk. Confirm in writing that the change hasn't been instructed and the application proceeds as submitted, then go and check your appointment's copyright and licence provisions — many make the client's licence to use your drawings conditional on fees being paid, and if yours does, you say it once, calmly, in writing, and never again.
The Bit That Actually Changes Your Year
None of this is about being tougher. Toughness isn't the missing ingredient; paperwork is. A practitioner with a countable baseline and a one-page notice template raises variations without any adrenaline at all, because there's nothing to be brave about — you're reading out the difference between what was agreed and what was asked for, and attaching a number.
The practices that bleed fees aren't soft. They're undocumented. Write the baseline before you need it, send the notice the same week, and stop paying for your clients' second thoughts.
