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Web and mobile app development: what a turnkey build includes

A turnkey build starts with a written plan. Agree the screens and the first release before coding.

In shortA turnkey web or mobile build covers design, logic, adaptation to screens and testing, then a launch. You get a written plan, a first release and a clear list of what is not included. MarketingExtra agrees the plan and the cost in writing before work starts and cannot promise store approval.
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What a web or mobile build can cover

Quick test: List the 5 screens a user must pass to finish the main task. If you list 12, cut the first release down.

Web and mobile application development can cover a public-facing website, an interactive web app or a mobile product, from initial design through implementation and maintenance. The right plan starts with the task the product must help someone complete, not with a predetermined list of features.

A website project may suit a company that needs to explain its offer, collect enquiries or give a team a manageable publishing interface. An application is a better fit when users need repeatable workflows, account-specific functions or an interactive product experience. If you are unsure, describe the user and their task before settling on the format.

A turnkey project can include:

  • Interface and visual design, including adaptation for desktop, mobile and tablet screens.
  • Business logic, workflows and agreed product features.
  • AI integration when it supports a clear user or operational need.
  • Search-engine optimization setup for website projects.
  • An admin panel or page, plus maintenance and management assistance.

For a focused campaign page, compare the plan with landing page design. For a broader view of design, video and development work, see the studio services.

What belongs in the project plan?

A useful project plan states what will be designed and built, how each part should behave, and what the team will receive at handover. It gives both sides a shared reference for decisions and helps prevent important requirements from appearing late in development.

Before work begins, prepare a short brief with the product goal, intended users, priority tasks, existing brand materials and any systems the product must connect to. Identify which features are essential for the first release and which can wait. If you have existing copy, design files or technical documentation, share them for review rather than assuming they can be reused unchanged.

A plan document should make clear:

  • The pages, screens or workflows covered by the work.
  • The design and device adaptations required.
  • Any AI feature, external integration or admin function requested.
  • Whether SEO setup, content entry or maintenance is included.
  • What decisions and materials the client needs to provide, and when.

A corporate website may also need a defined identity system; see brand book development if that work is not already in place. Confirm the intended what you receive and exclusions in writing so later requests can be assessed against the original plan.

Get the price for Web and App Development

Send a link to your project and a contact. We reply with a plan, timing and price.

How design and build run, step by step

The project moves from agreed requirements to design, implementation, review and handover. The sequence gives the client clear points to confirm how the product should look and behave before the team moves deeper into development.

First, the team reads the brief, available materials, user tasks and technical dependencies. Next, design work establishes the screens and interaction patterns; a screen-by-screen review lets the client flag missing states or unclear actions before implementation. Once the design direction is approved, development covers the agreed workflows and adaptations. Testing then checks the defined user journeys and the supported screen sizes against the plan.

To keep decisions moving, assign one client contact who can consolidate feedback and confirm priorities. Provide access to any relevant services, content, brand assets and technical contacts early. If a feature depends on an external provider, identify that dependency before build work is scheduled.

The project schedule is agreed around plan, review rounds, required integrations and client approvals. A small website and a feature-rich application do not have the same work sequence, so the schedule should reflect the actual what you receive. At handover, clarify what has been completed, what access or documentation is supplied, and how any agreed maintenance is handled.

When to add AI, SEO setup or upkeep

Rule of thumb: Release the smallest version that completes one real task. Add features after you see how people use it.

Add AI, SEO setup or maintenance when it serves a defined product need, rather than treating any of them as automatic extras. Each adds work that should be described in the plan and reviewed against the product’s users, content and operating requirements.

For an AI feature, specify the user’s task, the information the feature can use and what a helpful result looks like. This makes it possible to discuss the feature as part of the workflow instead of as a vague request to “add AI.” The team can then plan the interface and integration work needed for that feature. For complex AI products or agent-focused work, see AI agent development.

For a website, SEO setup belongs in the project brief if search visibility is a launch requirement. Clarify which pages and technical setup are in plan, and provide approved content or a plan for creating it. SEO setup is not the same as an ongoing content or search campaign, so state whether you need implementation only or continuing support.

Maintenance should identify the areas that need ongoing attention and the support the project requires after handover. Agree how requests are submitted, who handles them and which parts of the product are covered. These details make the post-launch arrangement actionable rather than leaving support expectations unstated.

Your 6-point app build checklist

Fill in these 6 points before you ask for a quote. A short, clear plan prevents most surprises and lets every offer you receive describe the same product, in the same order, so you can compare them fairly.

  1. Describe the main user task in 1 sentence.
  2. List the screens for the first release.
  3. Choose web, mobile or both.
  4. Name the systems the app must connect to.
  5. Decide who owns the code and accounts.
  6. Set a launch date and a test date.

Terms in one line

Turnkey (in plain words: a build delivered ready to use, from design to launch).

First release means the smallest working version that you put in front of real users.

What can affect a launch or later updates

A clear handover and an agreed plan make a launch easier to manage, but some dependencies sit outside the development work itself. App marketplace reviewers, operating-system changes and third-party API rules remain outside our control, so acceptance dates and uninterrupted compatibility with services we do not operate cannot be promised.

Reduce avoidable uncertainty by listing every external service, account, approval and client decision the product depends on. Confirm who owns those accounts and who will respond if a provider changes its requirements. If a mobile release needs marketplace submission, include that task and the materials required for review in the project plan rather than treating it as an automatic consequence of completing the build.

Send 3 things: your product idea in one paragraph, the screens you expect and the date you aim for. With those, we write the plan and confirm the cost in writing before any design or code starts.

How it works

  1. Share the product briefDescribe the intended users, the problem the product addresses and the main tasks it should support. Include existing assets, technical notes and required integrations.
  2. Confirm plan and prioritiesReview the proposed pages, screens, workflows and supporting services. Mark which features are essential for the first release and which can be considered later.
  3. Review design and implementationGive consolidated feedback at the agreed design review points, then check the implemented user journeys against the approved plan.
  4. Prepare handover and supportConfirm what is delivered, what access or documentation is included and whether maintenance or management assistance is part of the project.

Frequently asked questions

What should you prepare before asking for a build?

Prepare a short explanation of the product, the people who will use it and the main task it should help them complete. Add any existing designs, brand materials, content, technical notes and integrations. A list separating first-release essentials from later ideas helps the team define a realistic plan.

Can one project include a site and a mobile app?

Yes, a project can include multiple formats if they support the agreed product goals. The plan should name the pages, screens and workflows required for each format, along with any shared functionality. That makes it possible to plan design adaptations and development work without assuming every feature behaves identically on every device.

Can AI be added to a product that already exists?

AI integration can be considered as part of feature development. Explain the user task the feature should support, what information it needs and how users should interact with it. The team can review those requirements alongside the existing product and define the interface, workflow and integration work that belongs in plan.

How many weeks does a build take?

The schedule is agreed after the plan is reviewed. The number of screens and workflows, design approvals, integrations, client materials and review cycles all shape the work sequence. Ask for a schedule tied to specific what you receive and decision points, rather than relying on a timeline that was not based on your requirements.

Do SEO and upkeep come with the build?

Website projects can include SEO setup, and project maintenance or management assistance can also be planned. These should be listed explicitly in the what you receive: clarify which setup tasks are included, what support is expected after handover and which parts of the website or application that support covers.

Can anyone promise approval in an app store?

No. Marketplace reviewers make decisions outside the development team’s control, and external service requirements may change. We can plan the implementation and any agreed submission support, but an approval outcome or date cannot be promised. Share the relevant marketplace requirements early so they can be considered during planning.

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