About Us – Your Local Builder Next Door
At Rainbow Construction, we believe building work shouldn’t feel stressful or confusing.
We’re a small, experienced team based in South London, specialising in steel beam installations and structural alterations for homeowners just like you.
We keep things straightforward: no hidden costs, no jargon — just reliable expertise, a friendly chat about your project, and skilled work that stands the test of time.
How We Help Homeowners
Building projects often sound complicated — but we’ll guide you through step by step.
1. Free Advice
We explain building regulations, party wall rules, and approvals in plain English, so you feel confident from the start.
2. Clear Pricing
We’re upfront about costs, so you know where you stand before any work begins.
3. Safe & Certified
Our work is fully compliant with Building Control and carried out by skilled professionals — no shortcuts.
Services
-
Steel beam (RSJ) installations
-
Structural alterations – knock-throughs, openings, extensions
-
Working with structural engineers & Building Control
-
Guidance on Party Wall matters
We specialise in:
Why Choose Rainbow Construction?
Local & Approachable
We’re your South London builder next door — easy to talk to, quick to respond, and focused on homeowners, not big corporates.
Experienced & Skilled
Years of hands-on experience with structural steel work means your project is in safe, professional hands.
Trusted & Approved
Fully insured, accredited, and recommended by homeowners across South London.
Testimonials
Adam is a great guy, very helpful, very concerned to make sure everything is done properly. We were particularly impressed that he paid attention to every detail right to the end of the project. We've got all the building regs and certificates and we're really happy with the result.
Alexandra SW12 21 Sep 2010
Adam and his team did an excellent job. The work was completed to a very high standard and specification. Adam was always available to discuss problems and changes. I would not hesitate to recomend them and intend to use them for further work. Adam has a list of references and all who I spoke to gave him excellent feedback.
Christopher SW18 26 Jan 2011
They constructed through lounge. (Structural alteration). All work proceeded as planned. They have a good working relationship with Wandsworth building control, and did all the paperwork with out my involvement. Value for money: Good . Recommend!
Charles SW12 08 Oct 2014
Adam was professional and helpful, advising me on what could be done in the limited space and providing different cost options. His team arrived early and promptly and worked hard throughout.
V. SW18 31 Jul 2019
I am so glad that Rainbow Construction (particularly Adam) got in touch about this job. As we had an extension built, there were lots of moving parts to this job as it involved structural engineers, architects, building control etc and Adam took charge and really took the load off of us. The work completed to a high standard and Adam's communication was excellent throughout. He is trustworthy and we would definitely use him and recommend him to others without hesitation! Also very reasonably priced.
Rima SW16 05 Dec 2023
Privacy Notice
When you send us a message, we collect your name, phone number and email so we can reply and provide a quote. We don’t share your details with anyone else. We only keep your information for as long as needed to handle your enquiry. If you’d like us to delete your details, just let us know at steel@rainbow-construction.com