These two terms get used interchangeably, but they mean different things — and mixing them up can cause confusion when it comes time to sort out what's owed, what's refundable, and what you've actually agreed to. Here's a plain-language breakdown of how each works in a construction and renovation context.
The Short Version
A deposit secures a specific project. It's a partial payment made upfront, applied against your total project cost. You pay it at the start, and it gets credited when the final invoice is calculated.
A retainer secures access to someone's time. It's a fee paid to hold a contractor's or consultant's availability — for ongoing work, a pre-construction phase, or a standing advisory relationship. It may or may not be applied against future project costs, depending on the agreement.
Deposits in Construction
Deposits are standard practice in residential construction and renovation. When you confirm a project and sign a contract, a contractor will typically ask for a deposit before mobilizing. This covers a few things:
- Material purchases and pre-ordering lead-time items
- Scheduling commitment — holding a crew's time on the calendar
- Mobilization costs (equipment, site setup, planning time)
- Shared financial risk — it signals commitment on both sides
A typical deposit for a residential renovation or new build is 10–20% of the contract value, collected at signing. For remote or island projects — where materials need to be barged in well before work begins — deposits are often larger to reflect the logistics involved.
The deposit is always credited against the total project cost. It's not an extra charge. If your project totals $100,000 and you've paid a $15,000 deposit, you owe $85,000 on the remaining progress draws and final invoice.
A deposit is not a fee. It's the first portion of your project cost, paid early to get things moving.
Refundability
This is where it gets important to read your contract carefully. Whether a deposit is refundable — and under what conditions — should be spelled out explicitly. Common positions:
- Non-refundable if the client cancels after a certain point — once materials have been ordered or crew has been committed, cancellation has real costs.
- Refundable minus actual costs incurred — a fairer approach for early-stage cancellations where only planning time has been spent.
- Fully refundable during a review period — some contracts allow a short window after signing before the deposit becomes committed.
Always ask. A reputable contractor will explain their position clearly before you sign.
Retainers in Construction
Retainers are less common in standard residential construction, but you'll encounter them in a few specific situations:
- Pre-construction services — design consultations, site assessments, estimating, or 3D scanning done before a build contract is signed. You're paying for the contractor's or consultant's time at this stage, not committing to a full project.
- Project management or advisory roles — where a contractor is providing oversight or coordination rather than direct labour.
- Priority scheduling agreements — some contractors offer retainer arrangements to existing clients to ensure they get priority on scheduling for future work or service calls.
A retainer is about securing access to expertise or time, not a specific deliverable. You might pay a retainer to have a contractor available for planning meetings, answer questions during a design phase, or hold time on their schedule before a project is formally scoped.
Does a Retainer Get Applied to the Project?
Sometimes, sometimes not — and this is where it matters to be clear upfront. In some arrangements, a pre-construction retainer gets credited toward the eventual build contract. In others, it's a separate fee for a separate phase of work. Both are legitimate; the key is that it's documented clearly before any money changes hands.
What We Use at Ferguson Brothers
For construction and renovation projects, we work with a standard deposit collected at contract signing, applied against your total project cost. The amount depends on project size and logistics — remote island jobs require larger upfront material commitments than a North Shore renovation. We'll always walk through the payment structure before you sign anything.
For pre-construction services — like iGUIDE 3D scanning, planning consultation, or detailed estimating on a project that isn't yet under contract — we invoice for those services separately. If that work leads to a full project, the scope and pricing are set out in a new contract with its own deposit structure.