Written by Scott Whitehead, Founder of Zest City Ltd (MBA, MA). Zest City is a UK digital agency based in Kent and Essex, specialising in app development, AI integration, and digital growth services for businesses across the UK. Most agency pricing guides are useless. They say things like "apps can cost anywhere from £5,000 to £500,000" and leave you none the wiser. That's not a guide — that's a disclaimer. At Zest City, we believe UK businesses deserve straight answers before they commit a penny. So here is a genuinely transparent, opinionated breakdown of what building a business app actually...