Vetting Contractors as a Landlord

Vetting a contractor properly, before they set foot in a rental property, is the difference between a repair that gets done well and a repair that has to be redone at your expense a few months later, sometimes alongside a dispute about who is liable for what went wrong the first time. It takes a fraction of the time a bad repair costs to fix, yet it is one of the checks landlords most often skip under time pressure, particularly for an urgent job.

This guide sets out what to check before hiring a contractor, how to build a vetted list you can call on repeatedly rather than starting from scratch each time, the red flags worth taking seriously, and what records to keep once the work is done.

What to check before hiring

A short set of checks, done consistently before any significant job, catches most of the problems that lead to a poor repair or a liability dispute later:

• Qualifications and registration for regulated trades. Any gas work must be carried out by a Gas Safe registered engineer, and it is worth checking their registration and the specific categories of work they are registered for directly on the Gas Safe Register, not just taking their word for it. Electrical work should be carried out by someone registered with a recognised competent person scheme. Our Gas Safe engineer checking guide covers how to verify registration in more detail.
• Insurance. Ask for proof of public liability insurance before work starts, and check the certificate is current rather than assuming a contractor who has always had cover in the past still does. This protects you if the contractor's work causes damage to the property or injury to someone on site.
• References or a track record. A contractor with genuine, checkable references, or a solid history of work for other landlords or letting agents you trust, is a far safer bet than one found through a search with no verifiable history at all.
• A written quote, not just a verbal price. A quote that sets out the scope of work, materials, timescale and price in writing protects both sides if a dispute arises about what was actually agreed, and a contractor unwilling to put a quote in writing is itself worth treating as a signal.
• VAT registration and invoicing practices. A contractor who cannot provide a proper invoice, or who insists on cash with no paper trail at all for anything beyond a very small job, makes it harder to claim the cost against rental income and harder to resolve a dispute if the work turns out to be faulty.

Building a vetted list

Vetting a contractor from scratch every time a repair comes up is inefficient and increases the chance of skipping a check under time pressure. A better approach is building a small, trusted list by trade, covering the jobs that come up repeatedly across a portfolio:

• A Gas Safe registered engineer for annual gas safety checks and boiler repairs.
• A qualified electrician for EICR renewals and electrical repairs.
• A general handyman for routine, low-risk maintenance that does not require a regulated trade.
• A plumber, separate from the gas engineer unless the same person genuinely covers both, for non-gas plumbing issues.
• At least one contractor per trade as a backup, so a single contractor's availability, or a dispute over one job, does not leave you with no one to call for an urgent repair.

Once a contractor has proven reliable on a couple of jobs, keep their details, insurance and qualification records on file rather than re-requesting them for every subsequent job, updating the file only when a certificate or policy is due to expire. This turns vetting from a repeated task into a one-off setup per contractor, with a periodic check to keep the records current. Our managing maintenance as a landlord guide covers how a vetted list fits into the wider process of logging, prioritising and tracking repair jobs across a portfolio.

Red flags

A few signals are worth taking seriously, even from a contractor who otherwise seems competent:

• Reluctance to provide proof of qualifications or insurance. A genuinely qualified, insured contractor should be able to produce both quickly, and repeated excuses for not doing so are a reason to look elsewhere rather than proceed on trust.
• Pressure to pay a large deposit upfront, particularly for a contractor you have not used before. A modest deposit to cover materials is normal for larger jobs; a demand for most or all of the payment before any work starts is a common pattern in cases that end badly.
• Vague or verbal-only quotes that avoid specifying exactly what is included, which makes it easy for the final bill to grow well beyond what was originally discussed.
• Unwillingness to guarantee their own work. A contractor confident in their workmanship will usually offer some form of guarantee on labour, even if materials are covered separately by a manufacturer's warranty.

A worked example shows why this matters in practice. A landlord hires an unverified contractor found through a general search to fix a leaking pipe under time pressure, skipping the usual reference and insurance check because the job seemed urgent and minor. The repair fails within weeks, causing water damage to a ceiling below, and the contractor cannot be reached and has no traceable insurance, leaving the landlord to cover the full cost of both the original repair and the resulting damage. A five-minute insurance check before the original job would have avoided the entire situation, either by catching the lack of cover before hiring, or by giving the landlord a policy to claim against once things went wrong. Having a vetted contractor already on file for exactly this kind of job is also the difference between a same-day call to someone trusted and a rushed search under pressure, which our emergency repairs protocol guide covers in more depth for genuinely urgent situations.

Records to keep

Once a job is complete, keep a simple record for each contractor and each piece of work: the written quote and final invoice, proof of insurance and qualifications current at the time the work was carried out, any certificate the work itself generates (a gas safety record or electrical installation certificate, for example), and a note of the outcome, including whether the work needed revisiting. This record protects you if a dispute arises later about the quality or scope of the work, and it also builds the evidence behind your own vetted list, so future decisions about who to call are based on an actual track record rather than a general impression.

How Property HQ helps

Property HQ stores contractor details, insurance and qualification documents alongside the property and job they relate to, so a vetted contractor's records are ready to check before the next job, rather than searched for again each time something needs fixing.

Disclaimer

This guide is general information for UK landlords, not legal advice. Always verify a contractor's current registration, insurance and qualifications directly with the relevant scheme before hiring them for work on a rental property.