How to Manage a Builder on Your Project

For most homeowners, embarking on a major renovation or extension is a leap into the unknown. You have spent months perfecting the design and securing planning permission, but now comes the most daunting part: the construction phase. The question that keeps many homeowners awake at night is, "How do I actually manage a builder?"

The truth is, you should not have to manage a builder in the way you might manage an employee. A good builder is a professional running their own business. However, you do need to manage the relationship, the contract, and the financial flow of the project. Here is how to do it effectively.

Set Clear Expectations from Day One

Before a single block is laid, the terms of your agreement with the builder must be crystal clear. This means having a proper written contract in place—not just a handshake and a quote on the back of an envelope.

Your contract should clearly define the scope of works (exactly what the builder is responsible for delivering), the agreed contract sum, the programme (timeline) for the works, the payment schedule, and the process for dealing with changes (variations). When both parties know exactly what is expected, the potential for disputes is dramatically reduced.

Establish a Payment Schedule Linked to Progress

Never pay a builder large sums of money upfront. This is one of the most common and costly mistakes homeowners make. A builder who asks for 50% of the contract sum before starting work is a major red flag.

Instead, payments should be made in stages, linked to the completion of specific milestones or based on monthly valuations of work completed. For example, you might agree to pay upon completion of foundations, upon reaching wall plate level, upon the roof being watertight, and so on. This protects you because you are only ever paying for work that has been physically completed and inspected.

Appoint a Quantity Surveyor to Handle Valuations

This is where a Quantity Surveyor (QS) becomes invaluable. Rather than you having to assess whether the builder's invoice is fair—which is almost impossible without construction expertise—a QS will visit the site, measure the work completed, and certify the correct amount for payment.

This removes the emotion and guesswork from the payment process. The builder gets paid fairly for what they have done, and you are protected from overpaying. It also prevents the uncomfortable situation of you having to challenge the builder's invoice directly.

Communicate Regularly but Professionally

Good communication is the foundation of a successful project. Establish a regular communication rhythm with your builder—a weekly site meeting or a brief phone call to discuss progress, upcoming works, and any issues.

However, keep communication professional and documented. Important decisions, changes, or instructions should be confirmed in writing (even a simple email or text message). This creates a paper trail that protects both parties if a dispute arises later. Avoid the temptation to be on-site every day micromanaging the work. Trust your builder to do their job, but verify through regular check-ins.

Deal with Variations Properly

Changes during a build are inevitable. You might want to move a socket, upgrade a window, or add an extra radiator. These are called "variations," and they need to be managed carefully.

The golden rule is: agree the cost of any variation before the work is carried out. Never allow a builder to proceed with extra work on a "we'll sort it out later" basis. Get a written quote for the variation, agree it, and then instruct the builder to proceed. A QS can assess whether the builder's price for a variation is fair and reasonable.

Keep a Retention

Retention is a small percentage of each payment (typically 5%) that is held back until the end of the project. This is standard practice in the construction industry and serves as your insurance policy.

The retention is released in two halves: the first half when the project reaches "practical completion" (the building is finished and you can move in), and the second half at the end of the "defects liability period" (usually 6-12 months later). This ensures the builder has a financial incentive to come back and fix any snags or defects that emerge after you move in.

Know When to Escalate

If issues arise—poor workmanship, significant delays, or disputes over money—address them early and formally. Put your concerns in writing and give the builder a reasonable opportunity to rectify the issue.

If the problem persists, this is where having a QS or other professional advisor on your team is critical. They can assess the situation objectively, advise you on your contractual rights, and help you navigate the dispute without it escalating to legal proceedings.

If you are planning a renovation or new build in Dublin or Leinster and want expert support in managing the commercial side of your project, contact Crawford QS today.