Get clarity, compliance, and the right documentation for unconsented building work
A Certificate of Acceptance (COA) is required when building work has been completed without a building consent — either because the previous owner didn’t apply, you weren’t aware consent was needed, or urgent work was carried out at the time.
We help homeowners across Hamilton, Cambridge, Te Awamutu and the wider Waikato prepare and submit COA applications with clear, accurate documentation and professional support.
Your local Certificate of Acceptance design specialist in the Waikato
A COA can feel overwhelming, especially when you’ve discovered unconsented work you didn’t expect. As experienced architectural designers and Licensed Building Practitioners (LBPs), we assess the building work, prepare the required drawings, document the construction details, and guide you through the COA process so you can move forward confidently.
Whether your property is in Hamilton, Cambridge, Te Awamutu, Morrinsville, or anywhere in the Waikato, we can help you get the documentation you need.
We support Certificate of Acceptance applications for:
Interior renovations completed without consent
Decks, pergolas, and outdoor structures
Bathrooms, laundries, and kitchen alterations
Wall removals or layout changes
Additions and extensions completed by previous homeowners
Garage conversions and sleepouts
Plumbing or drainage changes
Urgent building work completed without consent
Why use Waikato Architectural Services for your COA application?
Accurate, compliant documentation
We produce the drawings, details, and construction information required by councils to assess your COA application, ensuring your paperwork is complete and professionally prepared.
Experienced with unconsented work
We regularly work with homes that have had renovations, extensions, or alterations completed without consent. We understand what councils look for and how to prepare documentation that meets requirements.
Local council knowledge
We work with Hamilton City Council, Waipā District Council, and Waikato District Council, and understand their expectations for COA submissions.
Simple, clear guidance
The COA process can be unfamiliar and stressful. We simplify each step, explain what’s needed, and communicate clearly so you know exactly where your application stands.
A smooth, structured approach
From site assessments to final documentation, we manage the design and drawing requirements needed for your application, making the process as efficient as possible.
Considering related work?
If unconsented work reveals structural issues, layout changes, or upgrades needed elsewhere in the home, we can help you explore your options.
Sometimes completing a COA is just the first step, and we can support any additional design or renovation work your home may require.
The COA process
Initial assessment
We assess the existing building work, identify what documentation is required, and review any available information.
Measure-up & drawings
We complete a site measure, prepare accurate as-built drawings, and detail the work that was completed.
Supporting documentation
We prepare and coordinate the information the council requires, such as construction details, specifications, and LBP records (where applicable).
Submission support
We assist you with preparing your COA application for council lodgement.
Council queries
We support you during the council review process and help address any requests for further information (RFIs).
Common COA projects we assist with
Renovations completed years ago without consent
Work discovered during pre-purchase inspections
Homes with missing or incomplete historic documentation
Garage conversions, sleepouts, and minor dwellings
Bathroom, laundry, and kitchen upgrades
Decks and outdoor structures
Internal wall removals and layout changes
Rural properties with undocumented work
FAQs
What is a Certificate of Acceptance?
A COA is council sign-off for building work completed without a consent, confirming the work meets current Building Code standards as built today.
Do I need a Certificate of Acceptance?
You may need a COA if building work was carried out without the required consent. This often comes up during property sales, insurance reviews, or when planning future renovations.
Can you help if I don’t know what work was done?
Yes — we can assess the property, identify unconsented work, and prepare the necessary drawings and documentation.
Can you help with council submissions?
Yes — we assist with preparing the COA application and help you respond to any council queries.
Do I need an architect for a COA?
No — a registered architect is not required. As LBPs and experienced architectural designers/draftsmen, we can prepare the drawings and documentation needed for COA applications.
How long does a COA application take?
Timeframes depend on the complexity of the work and council processing times. After assessing your property, we provide a clear timeline.
Ready to start your Certificate of Acceptance application?
Whether you're in Hamilton, Cambridge, Te Awamutu, Morrinsville, or anywhere in the Waikato, we can help you get the documentation you need.
Contact us today to book your COA assessment.
Specialises in renovations, extensions, and new builds across the Waikato. We deliver innovative designs and expert craftsmanship to bring your vision to life. Contact us today to start your project!
