Vibe Coding vs Hiring an Agency
What the Cost and Timeline Difference Means for You
A traditional development agency charges £25,000–£80,000 for an MVP and takes 3–6 months to deliver it. Vibe coding with professional oversight delivers a production-ready MVP in 5–7 days for a fraction of that cost. The decision between them is not about quality — it is about stage, complexity, and whether you have validated your idea yet.
Talk to an ExpertWhat the comparison actually looks like
A traditional development agency typically charges a day rate of £800–£2,500 and staffs projects with a project manager, a designer, and one or more developers. For an MVP, expect 8–16 weeks and a bill of £25,000–£80,000. The output is professionally engineered code, usually with documentation, testing, and post-launch support in the contract. Vibe coding with a quality-focused partner like Greta costs £3,000–£8,000 for an MVP and takes 5–7 days. The output is AI-assisted code reviewed by senior engineers, with full code ownership and no lock-in. The technical quality is comparable for early-stage products. The speed and cost difference is not marginal — it is categorical.
Traditional agency: £25k–£80k, 8–16 weeks, professional process
Vibe coding with review (Greta): £3k–£8k, 5–7 days, production-ready
Cost difference is 5–10x; time difference is 10–20x
Quality is comparable for early-stage builds — the agency advantage appears at scale
Why your current stage determines the right choice
The agency model was built for a world where building software was expensive and slow regardless. Its structured process — discovery, design, build, QA, launch — made sense when the alternative was ad hoc development that produced unmaintainable code. Vibe coding collapses that timeline without sacrificing the output quality for early-stage products. At the pre-validation stage, spending £40,000 with an agency is an enormous bet on an unvalidated idea. At the post-PMF stage, with 500 paying users and a clear product direction, an agency's structured process and team depth start to make sense. Stage is everything.
Pre-validation: spending £40k with an agency is a bet on an unproven idea
Post-PMF with traction: agency depth and structured process starts to justify the cost
Vibe coding preserves capital for the validated stage
The agency's structured process adds the most value when your requirements are stable and known
How to choose between vibe coding and an agency
The decision framework is stage-based:
Pre-idea validation (0 users): Always vibe code. Do not spend agency rates to discover the idea does not work
Idea validated, pre-build (waiting list exists): Vibe code with engineering review. Greta's sweet spot
Live product, sub-100 users: Vibe coding + ongoing iteration. Agencies are premature
Product-market fit, 100–1,000 users: Evaluate agency engagement for specific complex features
Scale (1,000+ users, complex requirements): Agency or in-house team is appropriate — infrastructure matters
Regulated industry at any stage: Qualified engineers are necessary regardless of scale
Real comparisons: same product, different approaches
These comparisons are based on real market outcomes from 2024–2025.
B2B SaaS MVP: Agency quote £48,000, 14 weeks. Greta delivered in 7 days at £5,500 — client reached £12,000 MRR before the agency would have delivered
Internal operations tool: Agency quote £22,000, 8 weeks. Vibe-coded with Lovable by the founder in 10 days — agency-level quality not needed at this scale
Marketplace platform: Agency built for £65,000 — well-engineered but took 5 months. First version vibe-coded to validate the model in 2 weeks first would have saved £30,000
Enterprise SaaS: Agency was the right call — custom compliance requirements, complex integrations, multi-region infrastructure
When hiring an agency is the right answer
Agencies are not always wrong — they are just wrong at the early stage for most builds. Here is when an agency is genuinely the right choice.
Complex regulated builds where compliance certification requires qualified engineer sign-off
Large team collaboration needs where agency's project management process adds real value
Enterprise clients who require agency credentials, NDAs, and insurance as part of procurement
Long-term maintenance contracts where ongoing support and SLA guarantees are required
Situations where the technical complexity is genuinely beyond what AI-assisted development can produce safely
How to extract maximum value regardless of which you choose
Whether you choose vibe coding or an agency, the principles that determine success are the same: validate first, scope tightly, and measure relentlessly. Vibe coding does not guarantee a good product — it guarantees a fast, cheap one. An agency does not guarantee a successful product — it guarantees a professionally built one. The product succeeds because of your market understanding and your ability to iterate based on evidence. Both vibe coding and agencies are tools in service of that outcome.
Validate market demand before engaging any external build partner
Scope tightly regardless of which approach you use — time and cost scale with scope
Define success metrics before the first line of code is written
Always retain full code ownership — agencies and vibe coding tools alike
Greta offers agency-quality output at vibe-coding speed and cost — talk to us before choosing
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