How to Choose the Right Roofing Contractor for Asphalt Shingle Installation

2. Ask Specifically About Their Experience With Asphalt Shingle

Experience with corrugated metal roofing does not translate directly to asphalt shingle installation. The two systems are laid, fastened and detailed differently.

Shingle installation requires correct nail patterns, precise course overlap, proper starter strip placement and careful detailing at ridges, hips, valleys and wall junctions. Over-nailing breaks the fibreglass mat and causes premature granule loss. Insufficient overlap creates points where water can travel back under the lap. These failures rarely show up at handover and become apparent one or two winters later.

Ask every contractor how many shingle roofs they have installed in the past couple of years. Ask to see photos of completed work. If they hesitate on either, that is useful information.

3. Understand What the Quote Covers

A lower quote is sometimes lower because something important has been left out. Before comparing prices, ask each contractor to break down:

• The underlay being used and its specification
• Whether removal and disposal of your existing roof is included
• How framing and timber repairs are handled
• The flashing and valley treatment approach
• Ridge ventilation
• Site clean-up and waste removal

A quote with no mention of ventilation or underlay quality is incomplete. These components directly affect how the system performs across its full service life. Our new asphalt shingle roof installation page covers what a properly scoped job looks like from start to finish.

4. Check the Products and Manufacturer Requirements

Quality shingle products come with published installation guidelines. These must be followed precisely or the product warranty is void. A contractor who is unfamiliar with these requirements, or dismissive of them, presents a real risk.

We install GAF architectural shingles and follow their specification on every project without exception. This protects the product warranty and the long term performance of your roof. Ask any contractor you're assessing which shingle brand they use, and whether they install to that manufacturer's specification.

5. Verify Insurance Before Work Begins

Your contractor must hold public liability insurance before starting on your property. Ask for evidence of this before signing anything. Credible companies have no issue providing it.

Get the complete scope of work in writing. This should include the materials specified, the timeline, workmanship warranty terms and what the process is if something is found to be incorrect after handover.

6. Red Flags Worth Knowing

Some warning signs only become visible if you're actively looking:

• No LBP licence or reluctance to produce the number
• A quote with no material or process breakdown
• Cash-only arrangements with no paper trail
• Urgency tactics around pricing
• No verifiable local address or track record
• Unwilling or unable to show prior shingle installations

If you're replacing an existing roof, our asphalt shingle re-roofing and roof replacement service covers what the process looks like from safe removal right through to final inspection.

7. Why Shingle Specialists Produce Better Results

There is a real and measurable difference between a generalist roofer who installs shingles occasionally and a team that works with this system every day. A specialist understands the full product range, knows how shingles perform in Auckland's coastal UV, wind and rain conditions, and brings the detailing experience to handle complex roof forms correctly.

As we discuss in our guide on how long an asphalt shingle roof lasts in New Zealand, installation quality is one of the single biggest variables in whether a roof reaches its full service life. A poorly installed system will need asphalt shingle roof repairs years before it should.

Choosing the right contractor from the start is the most cost-effective roofing decision you can make. We offer free, no-obligation quotes and are happy to walk through what your project involves before you commit to anything.

Frequently Asked Questions: Asphalt Shingle Roofing Contractors

Does a Roofing Contractor in New Zealand Need to Be Licensed?

Yes. Roofing is restricted building work under the Building Act 2004. Any person carrying out and signing off restricted roofing work must hold a Licensed Building Practitioner (LBP) licence in the roofing category. At the completion of the job, they must issue a record of work. This document is required for council consent applications, insurance purposes and future property transactions. Using an unlicensed contractor puts all of these at risk.

What Is the Difference Between a Shingle Specialist and a General Roofer?

A general roofer typically works across multiple systems, including long run metal, tiles and shingles. A shingle specialist focuses specifically on asphalt shingle systems, which means deeper product knowledge, familiarity with installation specifications from manufacturers like GAF, and practical experience with the details that general roofers may not encounter often enough to have mastered. For asphalt shingle work, the specialist difference is significant.

How Do I Know If a Quote Is Complete?

A properly itemised roofing quote will specify the shingle product and grade being used, the underlay being installed, whether old roof removal and disposal is included, how flashings and valleys will be treated, the ventilation approach, any framing repairs and the workmanship warranty on offer. A quote that is simply a total price with no breakdown is not a complete quote. Ask for the full itemisation before comparing figures.

What Warranties Should I Expect from a Roofing Contractor?

There are two distinct warranties to understand. The product warranty comes from the shingle manufacturer and covers the shingles themselves, subject to the installation meeting their guidelines. The workmanship warranty comes from the contractor and covers the quality of the installation. Both should be provided in writing. For GAF products, the product warranty is only valid when installation follows manufacturer specification, so confirming your contractor's process matters.

Can I Claim on My Home Insurance If the Roof Fails Due to Poor Installation?

Generally, home insurance covers sudden events rather than defects or maintenance failures. If a roof fails gradually because of poor installation, it is unlikely to be covered. This is precisely why LBP documentation, written quotes, and workmanship warranties matter so much. They give you legal recourse if the work falls short, which your insurer alone cannot provide.