House Construction
Duplex house construction with an open, connected family layout
Two-level duplex homes with double-height spaces, internal staircases and premium finishes, built to an itemised plan and warrantied for 10 years.
A duplex is one home spread across two levels, connected by an internal staircase, often with a double-height living room that makes the house feel open and grand.
Duplexes look simple on drawings but demand careful engineering: long spans, cut-outs in slabs, staircase loads and good ventilation through both levels. RennovEN builds them with the detailing they need.
Signs you need this
- You want living and sleeping areas on separate levels
- You like double-height spaces or a skylight
- You want a feature staircase as part of the design
- You want a single-family home rather than separate floors
The RennovEN promise
- 10-year warranty on all works
- Itemised pricing, approved before work begins
- One accountable team across every trade
- Residential specialists — homes only
Diagnosis
Why it happens
Slab cut-outs need design
Double-height voids and staircase openings change how the slab carries load and must be designed, not improvised on site.
Heat stacks upward
Warm air rises into the upper level. Without cross-ventilation and roof insulation, upstairs bedrooms overheat.
Staircase detailing
Rise, tread and landing dimensions decide whether the stairs are comfortable for parents and children for decades.
Our method
How RennovEN does it
- 1
Concept
Layout with double-height zones, light and ventilation planned in.
- 2
Engineering
Structural design for spans, voids and the staircase.
- 3
Construction
Civil and services with stage-wise quality checks.
- 4
Finishing
Premium flooring, railings, lighting and handover with warranty.
What’s included
- Design for double-height and staircase areas
- Roof insulation or cool-roof coating option
- Railings and staircase finishing
- Itemised BOQ with finish specification
- 10-year warranty on all works
What affects the cost
- Total built-up area across both levels
- Extent of double-height spaces and glazing
- Staircase type and railing material
- Finish specification
- Foundation and soil conditions
Every home is different, so we don’t publish rate cards. After a free inspection you get an itemised estimate, and you approve every line before work begins.
Get my itemised estimate10-year warranty
The complete duplex — structure, staircase, services, waterproofing and finishes we deliver — is covered for 10 years against workmanship defects.
How our warranty worksFAQ
Duplex House Construction: your questions
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