Every project is scoped individually - site complexity, number of markets, SPA architecture, consent requirements, and ad platform integrations all affect the final investment. These packages give you a clear picture of what each level covers. Get in touch and we will scope your project honestly.
What Sets Us Apart
TagNexus operates at a technical depth that goes beyond standard GA4 and GTM implementation. These are the things we handle that most people do not even know to look for.
When the Google tag fires on Consent Initialisation before OneTrust has updated the consent state, you get both a GDPR violation and _gl URL pollution in GA4 reports. We fix this at the tag level - not with report filters.
When a user moves from your marketing site to an onboarding or consultation subdomain, standard tracking breaks entirely. Consent state, session continuity, and cross-domain identification all need deliberate configuration - we handle all of it.
UTM parameters captured on landing are stored in localStorage and injected into hidden form fields on submission - passing the original acquisition source through to HubSpot, Acton, or any CRM even when the user converts sessions later.
We implement the complete first-party data collection infrastructure - reverse proxy for first-party script serving, Google Tag Gateway, and Addingwell-hosted server-side GTM - making your entire tracking stack invisible to ad blockers and browser restrictions.
Containers that rely on GTM's built-in click variables and auto-event triggers are fragile and inconsistent. We rebuild them entirely around structured dataLayer pushes - clean, stable, and developer-handover ready.
Meta CAPI, Google Ads Enhanced Conversions, and TikTok Events API - all implemented server-side with proper event deduplication. Multi-event conversion tracking for Google Ads gives the algorithm richer signals to optimise against.
Our Packages
Every engagement - regardless of package - includes QA validation, full handover documentation, and direct coordination with your development team.
You suspect your analytics is not telling the full story. We find out exactly what is wrong, what is missing, and what it will take to fix it - before any implementation work begins.
Your analytics is rebuilt from the ground up - starting with a structured dataLayer, through to clean data collection, privacy-compliant consent, and reliable marketing attribution across your ad platforms. Data your team can trust.
Your analytics infrastructure becomes fully first-party - ad blocker resistant, privacy-compliant, and sending reliable conversion signals to every ad platform server-side. For businesses where incomplete data is not an option.
What Affects the Investment
These are the factors that influence the final scope and investment. We go through all of these on an initial scoping call before any work begins.
Single Page Applications with subdomain routing require significantly more configuration - consent persistence, virtual pageviews, and cross-domain tracking all need custom solutions.
EU-facing businesses with GDPR requirements, multi-language sites, and different consent requirements by region add significant scope.
A clean, well-structured container is faster to build on than years of accumulated tags with no documentation and heavy reliance on built-in GTM variables.
Multi-event conversion tracking for Google Ads - form_start, form_submit, phone clicks, chat opens - adds more scope than a single macro conversion setup.
Faster dev turnaround on dataLayer implementation means faster delivery overall. Slower dev cycles extend the timeline and sometimes the engagement scope.
Each server-side ad platform integration - Meta CAPI, Google Ads Enhanced Conversions, TikTok Events API - adds scope. Deduplication logic for each platform also adds time.
Compare Packages
| Capability | Audit & Foundation | Full Implementation | Enterprise First-Party |
|---|---|---|---|
| GTM Container Audit | ✓ | ✓ | ✓ |
| GA4 Property Audit | ✓ | ✓ | ✓ |
| Consent Mode Compliance Check | ✓ | ✓ | ✓ |
| _gl URL Pollution Diagnosis | ✓ | ✓ | ✓ |
| Written Findings Report | ✓ | ✓ | ✓ |
| Full Handover Documentation | ✓ | ✓ | ✓ |
| dataLayer Architecture & SDR | - | ✓ | ✓ |
| GTM Container Build (dataLayer-driven) | - | ✓ | ✓ |
| GA4 Full Setup & Event Taxonomy | - | ✓ | ✓ |
| Consent Mode v2 Basic Implementation | - | ✓ | ✓ |
| Consent Race Condition Fix | - | ✓ | ✓ |
| Multi-Event Google Ads Conversion Tracking | - | ✓ | ✓ |
| BigQuery Export | - | ✓ | ✓ |
| Dev Team Coordination | - | ✓ | ✓ |
| 30-Day Post-Launch Support | - | ✓ | ✓ |
| Reverse Proxy Setup | - | - | ✓ |
| Google Tag Gateway (GTG) | - | - | ✓ |
| Addingwell Server-Side GTM | - | - | ✓ |
| Meta Conversions API (Server-Side) | - | - | ✓ |
| Google Ads Enhanced Conversions (Server-Side) | - | - | ✓ |
| TikTok Events API (Server-Side) | - | - | ✓ |
| SPA & Subdomain Tracking | - | - | ✓ |
| UTM localStorage → CRM Hidden Fields | - | - | ✓ |
| Dual GTM Container Management | - | - | ✓ |
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