09 projects # Trades you need for extensions & additions ## Summary An extension needs design and engineering, then structure and enclosure, then services and finishes that match the existing home. 15 trades are usually involved: architects, designers and draughtspeople, structural and geotechnical engineers, earthmovers, excavation and site prep, concrete and foundation contractors, scaffolders, roofers and spouting/gutter installers, window and door installers, glaziers and double-glazing retrofitters, cladding and recladding specialists, insulation installers, plumbers and gasfitters, electricians, plasterers and GIB stoppers, painters and decorators, flooring (carpet, timber, vinyl, polished concrete), heat pump, HVAC and ventilation installers. An extension needs design and engineering, then structure and enclosure, then services and finishes that match the existing home. ## Typical order 1. **Design and consent**: [Architects, designers and draughtspeople](/trades/architects-designers/), [Structural and geotechnical engineers](/trades/engineers/) 2. **Site prep and earthworks**: [Earthmovers, excavation and site prep](/trades/earthmovers/) 3. **Foundations and structure**: [Concrete and foundation contractors](/trades/concrete-foundations/) 4. **Roof and cladding (weathertight)**: [Scaffolders](/trades/scaffolders/), [Roofers and spouting/gutter installers](/trades/roofers-spouting/), [Window and door installers, glaziers and double-glazing retrofitters](/trades/windows-doors-glazing/), [Cladding and recladding specialists](/trades/cladding-recladding/) 5. **Services first fix**: [Plumbers and gasfitters](/trades/plumbers-gasfitters/), [Electricians](/trades/electricians/), [Heat pump, HVAC and ventilation installers](/trades/heat-pumps-hvac/) 6. **Insulation and linings**: [Plasterers and GIB stoppers](/trades/plasterers-gib-stoppers/), [Insulation installers](/trades/insulation/) 7. **Fit-out and finishes**: [Painters and decorators](/trades/painters-decorators/), [Flooring (carpet, timber, vinyl, polished concrete)](/trades/flooring/) Trades appear under the first stage where they are needed. Your builder sets the real sequence. ## Trades you'll need for extensions & additions Sponsored businesses are shown first in each trade, then other listings. Add them to a comparison one by one or all together. No suggested businesses are listed yet, so there is nothing to add to a comparison. Each trade below links to its page. * ### [Architects, designers and draughtspeople](/trades/architects-designers/) Concept and consent drawings for new builds and renovations. No architects, designers and draughtspeople listings yet. [See what they do, how to check them and how to join](/trades/architects-designers/). * ### [Structural and geotechnical engineers](/trades/engineers/) Structural design, geotechnical reports and producer statements. No structural and geotechnical engineers listings yet. [See what they do, how to check them and how to join](/trades/engineers/). * ### [Earthmovers, excavation and site prep](/trades/earthmovers/) Excavation, site clearing, cut and fill, trenching and access. No earthmovers, excavation and site prep listings yet. [See what they do, how to check them and how to join](/trades/earthmovers/). * ### [Concrete and foundation contractors](/trades/concrete-foundations/) Slabs, footings, piles, driveways and floors. No concrete and foundation contractors listings yet. [See what they do, how to check them and how to join](/trades/concrete-foundations/). * ### [Scaffolders](/trades/scaffolders/) Scaffolding for building, cladding and roof work. No scaffolders listings yet. [See what they do, how to check them and how to join](/trades/scaffolders/). * ### [Roofers and spouting/gutter installers](/trades/roofers-spouting/) Roof replacement, repairs, flashings, spouting and downpipes. No roofers and spouting/gutter installers listings yet. [See what they do, how to check them and how to join](/trades/roofers-spouting/). * ### [Window and door installers, glaziers and double-glazing retrofitters](/trades/windows-doors-glazing/) New windows and doors, glass repairs, and double-glazing retrofits. No window and door installers, glaziers and double-glazing retrofitters listings yet. [See what they do, how to check them and how to join](/trades/windows-doors-glazing/). * ### [Cladding and recladding specialists](/trades/cladding-recladding/) New cladding, recladding and weathertightness repairs. No cladding and recladding specialists listings yet. [See what they do, how to check them and how to join](/trades/cladding-recladding/). * ### [Plasterers and GIB stoppers](/trades/plasterers-gib-stoppers/) Interior wall and ceiling linings and stopping, and exterior plastering. No plasterers and GIB stoppers listings yet. [See what they do, how to check them and how to join](/trades/plasterers-gib-stoppers/). * ### [Plumbers and gasfitters](/trades/plumbers-gasfitters/) Water supply, waste, hot water, gas and drainage connections. No plumbers and gasfitters listings yet. [See what they do, how to check them and how to join](/trades/plumbers-gasfitters/). * ### [Electricians](/trades/electricians/) Wiring, switchboards, lighting, power and electrical safety. No electricians listings yet. [See what they do, how to check them and how to join](/trades/electricians/). * ### [Heat pump, HVAC and ventilation installers](/trades/heat-pumps-hvac/) Heat pumps, ducted systems, ventilation and heat recovery. No heat pump, HVAC and ventilation installers listings yet. [See what they do, how to check them and how to join](/trades/heat-pumps-hvac/). * ### [Insulation installers](/trades/insulation/) Ceiling, underfloor and wall insulation for new builds and retrofits. No insulation installers listings yet. [See what they do, how to check them and how to join](/trades/insulation/). * ### [Painters and decorators](/trades/painters-decorators/) Interior and exterior painting, wallpaper and protective coatings. No painters and decorators listings yet. [See what they do, how to check them and how to join](/trades/painters-decorators/). * ### [Flooring (carpet, timber, vinyl, polished concrete)](/trades/flooring/) Carpet, timber, vinyl, tile-look and polished concrete floors. No flooring (carpet, timber, vinyl, polished concrete) listings yet. [See what they do, how to check them and how to join](/trades/flooring/). [Find builders for this project](/find/?type=Extensions & additions) [All trades](/trades/)