How often should I audit utilities?

Once a year is plenty for most households. Set a recurring 30-minute calendar block.

Will switching providers always save money?

Not always. Sometimes the best save comes from asking your current provider to match a competitor's intro offer.

What about energy supplier switching?

In deregulated markets it can help, but read the contract carefully — variable rates after intro periods can wipe out the savings.

Back to Blog

Utilities

How to Audit Your Utility Bills in 30 Minutes

The CostWise Team June 18, 2025 6 min read

Utilities are the most automated part of most budgets — which is exactly why they leak. A simple yearly audit consistently turns up money worth recovering.

Table of contents

1. Step 1: Gather 12 months of statements
2. Step 2: Look for promo expirations
3. Step 3: Question every recurring add-on
4. Real-world examples
5. Common mistakes during a utility audit

Step 1: Gather 12 months of statements

Pull the last year of bills for electricity, gas, water, internet, and mobile. Most providers offer downloads inside the account portal.

You're looking for trends, surprises, and any fees that show up without an obvious reason.

Step 2: Look for promo expirations

Internet and mobile bills frequently jump $20–$50 when a promo period ends. A short call asking 'is there a current promo I should be on?' often restores the lower rate.

Step 3: Question every recurring add-on

Equipment rental, line protection, premium support — most of these are optional.

Router/modem rental → buy your own
Phone insurance you're not using
'Inside wiring' protection plans
Old streaming bundles tied to a phone plan

Real-world examples

A household pulled twelve months of internet bills and noticed a $25 jump in month seven. A five-minute call referencing a competitor's current promo brought the rate back down — saving roughly $300 over the next year with no change in service.

Another family audited their mobile plan and discovered they were paying for three lines of insurance, but only one phone was still under warranty and only one family member had ever filed a claim. Dropping two lines of insurance saved $216 a year.

Water bills are often the sleeper category. A slow toilet leak can add $15–$40 a month without ever being visible. A single dye-tablet test during an audit can pay for years of the time spent doing the audit itself.

Common mistakes during a utility audit

The most common mistake is switching providers without reading the contract. Intro rates often roll into variable rates that exceed the original plan. Always check the post-promo price and the contract length before signing.

Another mistake is auditing once and never again. Providers reintroduce fees, change plan structures, and roll out new promos constantly. A 30-minute calendar block every twelve months catches drift before it compounds.