Should Installers Manage DNO Applications In-House or Outsource?

Every installer, sooner or later, hits the same crossroads on DNO applications. Do you keep the whole process in-house, where your team fills in the forms, drafts the SLDs, chases the DNO, and manages the paperwork? Or do you outsource the lot to specialists and get the applications off your desk entirely?

There's no universally right answer. But there's a right answer for your business, and it usually depends on how many applications you do a month, how technical your team is, and how much of your day you want to spend chasing design engineers.

Option A: Manage DNO Applications In-House

You keep control end-to-end. Your admin team or a technical lead fills in the DNO forms, drafts single line diagrams, uploads to the DNO portal, and chases updates when things go quiet.

What works about it

• Full visibility. Nothing is a black box. You know exactly where every application is because your team is the one moving it.
• No per-application fee. You're not paying a specialist per job, so the marginal cost per application is close to zero (once you have the internal capacity).
• You build institutional knowledge. Over time your team gets sharper on the technical detail: G100 arrangements, per-phase routing, DNO-specific quirks.
• Fast context switching. When a customer calls asking about their approval, someone on your team can answer immediately without checking with an external provider.

What breaks about it

• Time drain. Every application eats hours: gathering the MPAN, drafting the SLD, uploading, chasing, responding to DNO clarifications. Multiply that by 20 jobs a month and it's a full-time role.
• First-pass rejection rate. DNOs reject or query a large share of applications, often because of small SLD errors, per-phase miscalculations, or missing G100 detail. Every rejection costs you days.
• Chase fatigue. Applications sit with design engineers for weeks. If nobody is systematically following up every 5 working days, they drift.
• Knowledge concentration. The person who knows DNO applications inside out becomes irreplaceable, and when they leave, the whole process wobbles.
• Poor visibility for the rest of the team. If the applications live in one person's inbox, sales and install teams can't see status without asking.

Option B: Outsource to a DNO Application Specialist

You hand each job to a specialist team. They fill in the forms, draft the SLDs to DNO standard, submit to the DNO, chase the design engineer, and hand you back an approval.

What works about it

• Speed. A specialist team submits applications the same day or next day, rather than when your admin lead gets a free afternoon.
• Higher first-pass approval rate. Because the SLD, per-phase calculations, and DNO-specific presentation are done correctly the first time, rejections drop sharply.
• Zero chase work. Someone else is following up with the DNO. You get told when there's a decision, not when there's silence.
• Capacity that scales. Whether you're doing 5 applications a month or 50, the specialist scales with you. Your admin team doesn't.
• Fixed pricing. A predictable per-application fee is much easier to price into your quotes than "however long it takes our team".

What breaks about it

• Per-application cost. There is a real cost per application. For high-volume installers, that adds up (though it's usually cheaper than the internal admin hours it replaces).
• Loss of visibility, if you pick the wrong provider. Traditional consultancies work by email. You send a job, then you wait. This is the biggest failure mode of outsourcing.
• Less in-house knowledge over time. Your team stops learning the technical detail, which can be a problem if you ever want to bring it back in-house.
• Dependency. If the specialist has a bad week, so do you.

The Visibility Problem

If you talk to installers who've tried outsourcing and pulled back, the reason is almost always the same: they lost visibility. A consultancy that submits your applications by email and only responds when you chase them for updates is worse than doing it yourself, even if their technical work is better.

Modern DNO application services solve this with software: a live portal where you can see every application's stage, every document, every DNO update, in real time. The outsourcing model only really works when you can see what's happening at all times.

Which One Fits Which Installer?

Here's the honest version:

• 1-3 applications a month, technical team already in place: in-house is fine. The volume doesn't justify the fee, and your team can absorb the workload.
• 4-15 applications a month: this is where in-house starts to hurt. Rejections eat time, chase work piles up, and one person becomes the bottleneck. Outsourcing (with visibility) usually wins here.
• 15+ applications a month: outsource, or dedicate a full-time person to it. There's no middle ground. At this volume, DIY without a dedicated resource means missed deadlines and stalled installs.
• Mixed portfolio (some easy G98s, some complex G99s): this is where the interesting third option comes in.

The Hybrid Model: Self-Managed, With Escalation

Most installers we talk to actually want something between the two extremes. They're happy to manage the straightforward G98 notifications themselves (they're quick, they're low-risk, and they don't need a specialist). But they want to hand off the technical G99 applications, the export-limited jobs, and the anything-that-goes-wrong to a specialist.

That's the model behind our DNO Renewables CRM: a free, self-managed workspace where installers track their own applications, update statuses, upload documents, and add reference numbers, with a one-click escalation to our expert team for any job they don't want to handle themselves. Same portal, same visibility, but you decide job by job whether we're doing the work or you are.

It's designed for installers who want the control and cost efficiency of in-house, without losing access to specialists when they need them.

The Bottom Line

In-house works if you're low-volume and your team has the technical knowledge to get applications right first time. Outsourcing works if you're higher-volume and you pick a provider with real visibility. And the hybrid model, tracking your own applications with expert help when you need it, is where a lot of installers are heading next.

Whichever you choose, the two things that matter most are the same: visibility on where every application is right now, and quality so that applications get approved first time. Everything else is a variation on those two.