House Construction
Add a floor to your existing house — safely, after a structural check
We assess whether your foundation and columns can carry another floor, strengthen them if needed, then build it with a 10-year warranty.
Building upward is often the most affordable way to gain space when land is expensive. But an extra floor is extra load on columns and footings that were sized years ago, sometimes without any design at all.
RennovEN starts with a structural assessment. If your house can safely take another floor, we build it. If it needs strengthening, we tell you exactly what and why. If it cannot, we say so honestly.
Signs you need this
- Your family needs more rooms but not a new plot
- You want rental income from a new upper floor
- The original builder’s drawings are missing
- You are unsure whether the house can take extra load
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
Unknown original design
Many older homes were built without structural drawings, so their real capacity must be checked on site.
Undersized columns
Columns built for one or two floors may need jacketing before another floor is added.
Old roof slab
The existing roof becomes your new floor. Cracks, leaks or corroded steel must be fixed first.
Our method
How RennovEN does it
- 1
Structural assessment
Visual survey and checks of columns, footings and the existing slab.
- 2
Strengthening plan
Column jacketing or other measures, only if required.
- 3
Construction
New floor with proper connection to existing columns.
- 4
New roof protection
Waterproofing and handover with a 10-year warranty.
What’s included
- Structural assessment of the existing house
- Repair of the old roof slab before building
- Column extension and new floor construction
- Staircase extension and services connection
- Waterproofing of the new roof
What affects the cost
- Results of the structural assessment
- Need for column or footing strengthening
- Area and layout of the new floor
- Staircase extension and access
- Finish specification
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 new floor, any strengthening we carry out and the new roof waterproofing are covered for 10 years against workmanship defects.
How our warranty worksFAQ
Floor Addition on Existing House: your questions
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