Find a BuilderLondon & Southwestern Ontario

Custom Home Builders in London and Southwestern Ontario

London, St. Thomas, Woodstock, Tillsonburg and the rural townships of Middlesex, Oxford and Elgin.

Established builders who build complete custom homes on your land in London and Southwestern Ontario, listed against our published standard.

13 free listings (not vetted). Builders can list their company free or upgrade to a vetted listing.

Get matched with buildersHow we choose buildersBuilders: get listed

Builders in London and Southwestern Ontario

Every builder below showed dated public activity from November 2024 or later when we checked in November 2026. These are free listings compiled from public information. None of them has been vetted by BuildersOntario.com yet. Any builder can upgrade to a vetted listing: it confirms its HCRA licence and insurance to us, and we research it to make sure it fits.

LondonWoodfield Design BuildNew custom homes; additions and renovationsLondonLiersch Custom HomesNew custom homesLondonParry HomesNew custom homesSheddenSilver Ridge Design BuildNew custom homes; additions; remodellingSt. ThomasDHP HomesNew custom homesAylmerK2 Custom HomesCustom homes; renovations; additionsDorchesterDuncan Harwood Custom HomesCustom homes; homes in its own communitiesLondonPinnacle Group Design & BuildCustom new homes; renovationsLondonWestdel ConstructionNew custom homes; renovations; interior designLondonCrown Homes of LondonNew custom homes, including infill builds on client-owned landThorndalePrecision Homes LondonCustom homes; renovations; poolsLondonPatrick Hazzard Custom HomesCustom homesAylmerKeith Hunt ConstructionCustom homes; renovations

Areas this region covers

  • London
  • Middlesex County
  • Oxford County
  • Elgin County
  • St. Thomas
  • Woodstock
  • Tillsonburg

Building a custom home in London and Southwestern Ontario: what is different here

City lots and country lots

London has serviced infill and new-neighbourhood lots. Middlesex, Oxford and Elgin are largely farm country, with septic, wells and agricultural setbacks on many lots.
Serviced lot vs rural land · Building on agricultural and rural land

Lake Erie and river valleys

Lots along the Lake Erie bluffs and river valleys can carry erosion and flooding limits. Check with the conservation authority before you buy.
Floodplain and conservation authority lots

Before you hire any builder

  • Look the builder up on the HCRA Ontario Builder Directory. Anyone who builds a new home for you in Ontario must hold an HCRA licence, and the directory shows their licence status and history.
  • Ask for at least three recent completed homes you can drive past, and talk to those owners.
  • Ask for proof of liability insurance and a WSIB clearance certificate.
  • Get the scope, allowances, payment schedule and holdback in a written contract before any deposit.
  • Know your all-in budget first. The custom home cost calculator gives you a starting number.

Tell us about your project

Where you want to build, whether you own the land, your budget and your timeline. We send it to up to three builders in London and Southwestern Ontario who fit.

Get matched with buildersPrice your build first

About this directory

Who runs this directory: BuildersOntario.com is operated by ICFhome, a custom home builder in Simcoe County and South Georgian Bay. Builders are listed free when they meet our published standard. Payment never decides who is listed. Paid placements are always labelled. How we choose builders.