Billing additional work in an agency: how to protect margin and manage scope changes clearly?

Why does additional work reduce the profitability of agency projects?

Changes are a natural part of creative, marketing and digital projects. A client may change their mind, extend the campaign, add a new channel or ask for a solution that was not foreseen at the pricing stage.

The change itself is not the problem. The problem is the lack of a procedure to register, estimate and approve it.

Additional tasks vanish into overall project time

If the team logs additional work against the core tasks, after a few weeks it is hard to establish what caused the budget overrun.

The company sees that the project used more hours, but does not know:

• how much time came from the core scope,
• how much went on fixing errors,
• how much was taken up by the client changing their mind,
• what part of the work was not billed separately,
• which tasks were approved,
• what the cost of all the changes was.

Without this separation, you cannot reliably assess either profitability or the quality of the original estimate.

The team starts work before a business decision is made

A specialist receives a client request and focuses on delivering it. They do not always know the project’s current margin, the remaining budget or the contract terms.

In practice, the decision to start additional work may be taken without the knowledge of:

• the Project Manager,
• the Account Manager,
• the project owner,
• the person responsible for finance,
• a client representative authorised to approve the cost.

The task gets done, and only later does the question arise of who should pay for it.

The client treats the additional scope as part of the agreed price

If an agency delivers changes without separate pricing for a long time, the client may get used to this model.

Further requests start to be treated as a standard part of the service. An attempt to introduce an extra charge after several months may be seen as an unexpected change of rules.

That is why the boundaries should be communicated from the start of the cooperation.

Flexibility can mean responding quickly and pricing efficiently. It does not have to mean unlimited, unpaid work.

The cost of a change is bigger than the delivery hours alone

Additional work may involve not only the time of a designer, developer or copywriter.

You also have to account for:

• analysing the request,
• additional communication,
• preparing the quote,
• project management,
• internal consultations,
• quality control,
• testing,
• implementation,
• another round of approval,
• changing the schedule of the remaining work.

A task described as a “small tweak” can therefore involve several people and affect the whole project.

How to run billing of additional work in an agency properly?

The procedure should not be complicated. It must, however, ensure that additional scope is not delivered without awareness of its cost and its impact on the project.

1. Define what the core scope includes

The first step is to describe, as precisely as possible, what the client is buying.

It is worth specifying:

• the number of materials,
• the types of formats,
• the channels covered,
• the number of concept versions,
• the number of revision rounds,
• the scope of consultations,
• technical elements,
• the acceptance method,
• tasks excluded from the price.

The more general the offer, the greater the risk of differing interpretations.

It is also worth describing in the contract or order the procedure to follow when the scope changes.

2. Register every change as a separate item

An additional requirement should not remain only in a message, a comment or meeting notes.

Each change should include:

• a description of the task,
• the person who raised it,
• the date of the request,
• the project and stage,
• information on whether the task falls within the scope,
• the estimated number of hours,
• the people needed for delivery,
• external cost,
• impact on the deadline,
• approval status.

This approach makes it possible to reconstruct the full history of changes later.

3. Separate a defect from a new requirement

Not every fix should be paid for separately.

If a material or feature does not match the accepted specification, the cost of correcting it should fall on the supplier.

The following should be treated differently:

• a new format,
• another version of the concept,
• a change to previously accepted material,
• an additional subpage,
• an extension of the campaign,
• a new integration,
• an additional stage of work,
• a new business requirement.

The company should have a shared definition of these categories, so that the decision does not depend on the opinion of a single employee.

4. Estimate the full cost and the impact on margin

Before giving the quote to the client, you need to calculate:

• the number of hours for each person,
• the individual cost of the specialists,
• management time,
• subcontractor costs,
• materials or licences purchased,
• a buffer for testing and fixes,
• the planned margin.

A basic model can look like this:

Only then should the planned margin be added to the full cost, and the price prepared for the client.

5. Get clear approval before starting work

The client should receive information on:

• what will be done,
• why the task does not fall within the core scope,
• how much it will cost,
• what the impact on the deadline will be,
• when the work can start.

Approval should come from a person authorised to make financial decisions.

This way the team does not start work on an informal request from someone who later cannot approve the additional invoice.