Every number, sourced.
Last verified 4 July 2026
Most agency websites are full of statistics nobody can check. We think that’s a bad way to start a relationship built on trust, so every research figure, case-study result and industry average quoted on this site is listed below with a link to where it comes from. Check us.
Research statistics
- “Up to 4× conversion from well-designed UX”
Forrester Research — The Six Steps For Justifying Better UX - “19% of shoppers have abandoned an order over trust”
Baymard Institute - “+8.4% retail conversion from a 0.1s mobile speed gain”
Deloitte & Google — Milliseconds Make Millions (2020) - “38% bounce at 5s load vs ~9% at 2s”
Pingdom (2018) - “53% of mobile visits abandoned after 3 seconds”
Google / SOASTA (2016) - “Conversion falls ~4.4% per extra second of load time”
Portent (2019, updated 2022) - “Around half of UK web traffic is mobile”
StatCounter, UK, 2026 - “Users are most likely to leave in the first 10 seconds”
Nielsen Norman Group - “42-hour average lead response · 7× likelier to qualify within 1 hour · 23% never reply”
Harvard Business Review — The Short Life of Online Sales Leads (2011) - “21× more likely to qualify a lead replying in 5 minutes vs 30”
MIT / InsideSales.com Lead Response Management Study
Published case studies
- +50% quote requests — plumbing firm redesign
Rohring Results case study - +250% demo requests — Wasp Barcode
Conversion Sciences case study - +900% lead generation — MidSouth Pain Treatment Centers
Instrumental Group case study - +235% leads, Q1 vs Q1 — Stream Creative’s own relaunch
Stream Creative - +203% conversion rate — Parkway Physiotherapy
MarketingSherpa case study
UK industry averages
- Re-roof average £8,000 (range £4k–£19k)
Checkatrade cost guide - House extension £40k–£56k
Checkatrade cost guide - Whole-house windows ~£8,500
Federation of Master Builders - Hair transplant £4,000–£7,000
Wimpole Clinic pricing analysis - Dental implant ~£2,400
Bupa Dental Care - Aesthetics client value £3k–£5k over ~2 years
Glowday - Wedding venue £9,695 incl. catering
Bridebook UK Wedding Report - Estate agent fee ~£4,500 (1.42% avg incl. VAT)
HomeOwners Alliance - Conveyancing ~£2,400 average
Reallymoving Conveyancing Costs Index - House rewire £4,500–£8,000
Checkatrade cost guide - Google rewards good page experience
Google Search documentation
Our own claims
Package prices, timelines, the day-28 guarantee and the “pays for itself in one sale” worked examples are our own offers and arithmetic, not third-party statistics. The ROI calculator computes directly from the numbers you give it.
Spotted something off?
If any figure here has gone stale, tell us at contact@avestadigital.co.uk and we’ll fix it within a working day.