Short Answer
Yes — taking over an existing project is a normal part of agency work, and a well-run handover usually takes 2 to 4 weeks before the new team is fully productive. The pattern is familiar: a project is half-built and stalling, the previous developer has left or become unresponsive, or an in-house team has lost the original developer and needs continuity. The new agency runs a technical audit, gets the code building and deploying on their machines, documents what exists, and then continues the roadmap. The bigger question is not whether takeover is possible — it almost always is — but whether the existing codebase is worth continuing or whether a partial rebuild would be cheaper than carrying the debt.
How a Takeover Actually Works
A clean handover has four stages, and the timeline depends on how much exists from the previous team.
Stage one: technical audit. The new agency reviews the source code, database schema, deployment setup, third-party integrations, and any documentation. The goal is to understand what works, what is broken, what is missing, and what is technically risky. A short audit (3 to 5 days) is enough to produce an honest assessment and a plan.
Stage two: access and environment setup. The codebase needs to build, run, and deploy from the new team’s machines. This sounds trivial but is often where the real surprises emerge: missing environment variables, undocumented dependencies, hard-coded credentials, or services running on an old developer’s personal account. Getting a clean local development environment is the first real test of how the previous work was structured.
Stage three: documentation and stabilisation. The new team writes down what they have learned — the data model, the workflows, the integrations, the known issues. Where there are urgent bugs or security gaps, they are fixed during this phase. By the end, the agency knows the system well enough to be accountable for it.
Stage four: forward roadmap. With the system stable and understood, normal feature work can resume. By this point the new team has earned the right to recommend whether the codebase should continue as-is, be refactored in places, or in extreme cases be partially or fully rebuilt.
Why Businesses Need This
Software projects change hands more often than people expect. Developers leave, agencies are dropped, founders pivot, businesses are sold. A project that cannot be picked up by someone else is fragile by definition — and ownership of code without the ability to continue it is hollow. The willingness of an external team to take a project on, and the timeline they need to do so, is a useful health check on the existing codebase. A clean project can be picked up in days; a tangled one might take weeks before the new team can confidently change anything.
What to Look For
- A technical audit before commitments. No agency should commit to a long-term plan on an existing codebase without spending a few days reading it first. Audits cost a few thousand pounds and save many thousands.
- A written audit report. Strengths, weaknesses, risks, and a recommended path forward. Verbal assessments are not enough.
- An honest read on whether to continue, refactor, or rebuild. Some codebases are worth saving; some are not. A good agency will tell you which one you have.
- Access transfer support. Helping you move infrastructure accounts, repositories, and third-party services from the previous developer’s control to yours.
- A defined “handover complete” point. When does the new team take full accountability? It should be a named milestone, not a vague drift.
Common Mistakes
The most common mistake is assuming continuity is free. Picking up an unfamiliar codebase takes real time, and pretending otherwise just hides the cost in the first few months of slow feature work. The second is skipping the audit. Agencies that quote a takeover without reading the code are guessing — and the guess usually lands on the side that benefits them. The third is leaving access in the previous developer’s accounts. Until hosting, domain, repository, and third-party services are in your control, the handover is not complete regardless of what the new agency has done.
How We Approach This
We take over projects regularly and start with a fixed-price technical audit so both sides see the codebase honestly before committing to a longer engagement. The audit produces a written report with a clear recommendation on whether continuing, refactoring, or partial rebuild is the right path.
Start With an Audit
The services pages below cover legacy support and modernisation work and outline how we structure takeovers. If you have an existing project and are weighing up next steps, an audit is the natural first conversation.
Disclaimer: The information provided in this article is for general guidance only and does not override or replace any terms in your contract. While we aim to offer helpful insights through our Knowledge Center, the accuracy of content in this section is not guaranteed.