Reinforced Concrete (RC) Frame Construction for Small Developments
When a development grows beyond a few houses into apartments or mixed-use space, the structural frame becomes a big decision. Reinforced concrete (RC) is one of the most common choices for blocks of flats, particularly where fire resistance, sound insulation and long spans matter.
This article explains how RC frames work, what they cost in terms of time and risk, and when they suit a small development.
What is an RC frame?
An RC frame is a structure of concrete columns, beams and floor slabs reinforced with steel bars. The concrete resists compression, while the steel resists tension. Frames can be cast in place using formwork, or built using precast elements that are craned into position.
The finished frame carries all the loads on the building, so walls become non-structural infill, which gives architects greater freedom with layouts and openings.
Why developers choose RC
Fire resistance: concrete is inherently non-combustible and performs well in a fire
Acoustic separation: heavy floors reduce airborne and impact sound between flats
Flexible layouts: columns and slabs allow open plans and larger spans
Robustness: a concrete frame can support additional loads and later alterations
Mixed-use suitability: commercial units at ground level often need long spans that RC handles well
The trade-offs
RC is a wet trade, so it relies on formwork, rebar fixing, concrete pours and curing time. Cold weather and access constraints can slow progress, and cranes or concrete pumps need space on site. Programme planning is essential, with pour sequences and propping carefully organised.
Cost should be compared with alternatives such as steel frame, timber frame or masonry, on a whole-building basis. Faster alternatives sometimes reduce preliminaries but cost more in fire protection and acoustic detailing.
Foundations and groundworks come first
An RC frame places heavy, concentrated loads on foundations. The structural engineer will design pads, rafts or piles to suit the ground, based on a proper investigation. Setting out accuracy at this stage matters because column positions cannot easily be altered later.
Read our new build housing schemes guide for the wider sequence from acquisition to handover.
Is RC right for your scheme?
As a rule of thumb, RC becomes more attractive with taller buildings, commercial space at ground floor, and demanding fire and acoustic requirements. For houses and low-rise terraces, masonry or timber frame may be more economical. A contractor’s early advice, ideally before the design is fixed, can compare options for your specific site. For mixed-use projects, see also our mixed-use development guide.
Frequently asked questions
Is an RC frame more expensive than steel or timber?
It depends on the building. RC can be cost-effective when fire and acoustic performance are demanding, but it should be compared on a whole-building basis.
How long does an RC frame take to build?
It depends on the number of floors and the pour sequence. A detailed programme should be agreed with the structural engineer and contractor.
Can RC frames be used in mixed-use buildings?
Yes. RC suits mixed-use buildings because it can span ground-floor commercial space and support apartments above.
Do you build RC frame schemes?
Yes. We deliver RC frame structures as part of new build and mixed-use developments.
Talk to Berati Construction
Weighing up structural options for an apartment or mixed-use scheme? Berati Construction Ltd has more than 30 years' experience delivering new builds, conversions and refurbishments as a single-point main contractor. Call us on 020 3488 6466 or visit beraticonstruction.co.uk to discuss your project. Our office is at 12 Cecil Road, London NW10 8UJ.
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