10 Critical Questions to Ask Before Hiring Contractors on Your Investment Property
Hiring the wrong tradesperson can cost you thousands. Not just in rework, but in lost rental income, delayed sales, and reputational damage with tenants. As a property investor, your margin depends on controlling costs and timescales. Yet many of us still pick contractors based on a quick phone call or the cheapest quote.
I've seen renovation projects run three months over schedule because a plumber didn't disclose they were juggling five sites at once. I've watched investors discover structural issues mid-project because the surveyor's report was done by someone with no commercial property experience. These aren't edge cases. They happen regularly.
Before you sign anything or hand over a deposit, you need answers to these ten questions. They'll take an hour of your time now and save you weeks of headaches later.
1. Are You Properly Insured and Registered?
Ask for current public liability insurance certificates and employer's liability cover if they employ staff. For electrical work, insist on NICEIC or NAPIT registration. For gas work, it has to be Gas Safe Register. For plumbing, look for CIPHE membership or equivalent competence proof.
Don't accept promises. Get documentation. Insurance that lapses mid-project leaves you exposed to liability claims if something goes wrong. I know an investor who hired an uninsured roofer who fell through a skylight. The investor ended up covering the medical bills.
2. What's Your Current Workload and Timeline?
A cheap quote doesn't matter if the job doesn't start for four months. Ask specifically how many other projects they're running. Ask when they can actually mobilise to your site and when they expect to finish. Get this in writing as part of the quotation.
Contractors who are too busy will either delay your start date or spread themselves thin, meaning they show up two days a week instead of five. Both scenarios kill your timeline. You need someone who can commit proper resources to your project.
3. Have You Done Similar Properties Before?
A kitchen fitter who's done 200 residential refurbs is different from one who's only worked on new builds. An electrician experienced in period properties understands Victorian wiring challenges. A decorator who specialises in rental properties knows durable finishes and cost-effective colour schemes.
Ask for specific examples. Better still, ask for references from other investors you can actually contact. Not their mate's cousin. Real clients who'll tell you if work was finished on time and on budget.
4. How Do You Handle Unforeseen Issues?
You'll find problems on older properties. Asbestos in the insulation. Rotten joists behind the walls. Outdated wiring that needs replacing. Ask the contractor how they'd approach discovering issues mid-project. Do they stop work and wait for your instruction? Do they price contingencies into the estimate?
Get a sense of whether they're experienced enough to spot potential problems before they become costly surprises. A builder who immediately flags that you'll likely need underpinning has saved you tens of thousands compared to discovering it mid-renovation.
5. What's the Payment Schedule?
Never pay 50% upfront. That's the contractor's risk management, not yours. Standard practice for property work is 20-30% deposit upon signing, with staged payments tied to completion milestones. Final payment held back for 7-14 days after snag list completion.
Get the payment schedule written into the contract with clear conditions for each payment. This protects you and keeps the contractor motivated to finish properly.
6. What Warranty or Guarantee Do You Offer?
Electrical work should come with a test certificate valid for five years. Plumbing should include guarantees on materials and workmanship, typically 12 months. Roofing work often comes with 10-year guarantees on materials.
Contractors who won't guarantee their work are contractors you shouldn't hire. If something fails six months after they've left, you want recourse. Warranties also tell you they're confident in what they're doing.
7. Who's Responsible for Building Control and Permits?
Structural work, electrical rewiring, and plumbing installations often need building regulation sign-off. Clarify upfront who's applying for and paying for these inspections. Usually the contractor coordinates this, but you need confirmation.
If the contractor acts evasively about building control, walk away. Properties that haven't been properly sign-off create nightmares when you try to sell or refinance.
8. Will You Provide a Detailed Written Quote?
Not an estimate. A quote. Itemised. Breaking down labour, materials, and costs separately. Including all work scope and exclusions. A proper quote gives you certainty and prevents scope creep arguments later.
If someone won't provide a written quote and just wants a handshake deal, they're not professional enough for property work. Get everything documented.
9. What Communication and Site Management Can I Expect?
How often will they update you? Will they provide progress photos? Can you inspect work before they cover it up? Do they have a site manager for larger projects?
For BTL properties, you need to know if they'll work around tenant schedules or if they need vacant possession. For development projects, you need clarity on site management, health and safety protocols, and how they'll coordinate with other trades.
10. Can You Provide References From Recent Clients?
Get at least three references from similar projects completed in the last 18 months. Call them. Ask about punctuality, quality, budget adherence, and how they handled problems. Ask if they'd hire that contractor again.
A contractor with no references or only vague ones is a risk. People talk in the property community. Good traders have a track record you can verify.
Before You Sign Anything
Get everything in a contract. Timeline, payment schedule, scope of work, insurance requirements, warranty terms. Run three quotes for any major work. Compare not just price, but the answers to these ten questions.
Your margin depends on controlling costs and timescales. Hiring properly is how you do that.
