Sitemile
Custom WordPress Development

We Build the WordPress Projects Most Agencies Won’t Touch

Marketplaces, auction sites, classifieds, booking platforms, membership systems — the complex, custom builds that break page builders and overwhelm generalist teams. For 12+ years we’ve engineered these platforms on WordPress, and we’ve shipped several of them as products used on thousands of live sites. If your project is more than a brochure website, you’re in the right place.

12+years building on WordPress
1000sof sites run our platforms
Fullmarketplace & auction builds

What we’re known for building

  • Online marketplaces (Fiverr, Upwork, Thumbtack-style)
  • Auction platforms with bidding, escrow, anti-sniping
  • Classified ads and directory sites
  • Custom themes, plugins, and WooCommerce extensions
  • API integrations, payment systems, and automations

Not a template shop. We build custom functionality from a real engineering foundation — the kind you can maintain and grow.

Proof, not promises

Platforms We’ve Built and Ship as Products

Most agencies claim they can build complex sites. We can point to ours. These are real WordPress platforms we engineered and now sell as products — running on thousands of live sites. When you hire us for a custom build, this is the depth you get.

Custom WordPress auction platform build
WordPress marketplace platform development
Classified ads WordPress platform
Custom WordPress freelancer marketplace
Auctions

Auction & bidding platforms

Live and timed auctions, proxy and reverse bidding, anti-sniping, reserve prices, and escrow — the mechanics that trip up most WordPress teams. We build them as standard.

Marketplaces

Service & freelance marketplaces

Two-sided platforms with profiles, project posting, bidding, milestones, and secure payments — Upwork, Fiverr, and Thumbtack-style builds we’ve shipped repeatedly.

Classifieds

Classifieds & directories

Listing sites with categories, locations, paid and featured ads, search, and monetisation — Craigslist-style platforms built to scale and earn.

For agencies

White-Label WordPress Development

Agencies bring us the WordPress work their in-house team can’t take on — complex functionality, marketplace and auction builds, plugin engineering, tough integrations — and we deliver it under your brand. Clean, documented code, no proprietary lock-in, and clear handoffs, so you keep the client relationship while we handle the hard engineering.

It’s a dependable way to widen what your agency can sell without hiring specialist developers or risking a build your team hasn’t done before.

Talk About a Partnership

How agencies work with us

  • Overflow development when your team is at capacity
  • Specialist builds (marketplaces, auctions, custom plugins)
  • Delivered under your brand, to your client
  • Clean, documented code with no vendor lock-in
  • Fixed scope and clear handoffs
  • An extension of your team, not a competitor to it

Straightforward Pricing for Custom Work

Most agencies hide their pricing. We don’t. Here’s roughly where projects start, depending on how much custom engineering they need. Every build begins with a conversation so we can scope it properly — no surprise invoices.

Focused Build

For a specific piece of custom functionality on an existing WordPress site.

$1,000 from, USD
  • Custom page templates and layouts
  • New site functionality or features
  • Theme and front-end fixes
  • Performance and structure improvements
  • Clean, maintainable implementation
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Enterprise & Ongoing

For large builds, white-label partnerships, or continuous development retainers.

Let’s Talk
  • Complex, multi-stage platform builds
  • White-label agency partnerships
  • Mobile app development (iOS & Android)
  • Dedicated ongoing development
  • Tailored entirely to your requirements
Contact Us

Pricing depends on scope. Every project starts with a discussion so we can recommend the right approach for your goals and budget.

Why Work With Us Instead of a General Agency

Plenty of teams can build a WordPress brochure site. Far fewer can build a platform with real logic — bidding, payments, two-sided users, custom workflows — and support it afterwards. That’s the gap we fill.

We’ve Actually Built It

Marketplaces, auctions, and classifieds aren’t a stretch goal for us — they’re products we ship. You’re hiring proven experience, not a first attempt.

Real Engineering

Clean, structured, maintainable code — not a pile of plugins pretending to be a platform. Your build stays stable as it grows.

You Own It

No proprietary frameworks or vendor lock-in. You get the full codebase and clear documentation, so any team can maintain it.

Transparent Pricing

Clear scope, honest starting prices, and no mystery invoices. You know what you’re paying for before we begin.

How a Custom Build Works

Every project starts with understanding what your platform needs to do — your business model, the features users need, the systems it must connect to, and the outcome you’re after. Complex builds fail when this step is skipped, so we don’t skip it.

From there we plan the architecture — data structure, user flows, payments, integrations — before writing code. Then we build, test against real scenarios, and hand over a documented platform you own outright.

For marketplaces and auctions especially, this upfront planning is what separates a platform that scales from one that collapses under its first hundred users.

Typical project flow

  • Discovery and technical consultation
  • Architecture and feature planning
  • Custom development and implementation
  • Integration and real-scenario testing
  • Review, revisions, and launch
  • Ongoing support and development when needed

Got a Complex WordPress Project in Mind?

Whether it’s a marketplace, an auction platform, a classifieds site, advanced WooCommerce, or a white-label build for your agency — if it’s ambitious, it’s the kind of work we do best. Tell us what you’re building and we’ll map out how to get it done.

Discuss Your Project

Frequently Asked Questions

Can you build a marketplace or auction site on WordPress?

Yes — it’s our specialty. We’ve built freelance marketplaces, service marketplaces, and auction platforms (with bidding, escrow, and payments) on WordPress, and we ship several as products. Complex two-sided platforms are exactly what we do.

Do you offer white-label development for agencies?

Yes. Agencies regularly bring us WordPress work their team can’t take on, and we deliver it under their brand with clean, documented code and clear handoffs. You keep the client; we handle the engineering.

How much does a custom WordPress project cost?

Focused functionality on an existing site starts around $1,000. A full custom platform — marketplace, auction, or classifieds — typically starts around $4,500 depending on scope. Larger and ongoing work is quoted after we understand the project.

Will I own the code, or am I locked in?

You own it. We build on standard WordPress practices with no proprietary frameworks or hidden dependencies, and we hand over the full codebase and documentation so any developer can maintain it.

Can you improve or rescue an existing WordPress site?

Often, yes. We take on sites that have outgrown their setup or been left in a fragile state — cleaning up structure, adding real functionality, and making them faster and easier to maintain.

Do you also build mobile apps?

Yes. For platforms that need a native presence, we offer iOS and Android app development alongside the WordPress build, so your marketplace or auction site works everywhere your users are.