Subfloor Preparation Services in London
Subfloor Preparation
Levelling, repairs and screeding to get your subfloor ready, carried out across London. Free survey and fixed quote.
15+ Years Experience
Established London flooring contractor
276+ Projects Completed
Across residential & commercial
5-Star Rated
Google & Checkatrade reviews
Fully Insured
Public liability covered
Subfloor Preparation
For Best Long Term Results
Subfloor preparation is the most important step before installing your floor. We create a smooth and dry base so your new flooring lasts longer.
At ROI Flooring, we serve homes and businesses across London with expert subfloor services.
Bad subfloors cause cracked tiles, squeaky boards, and poor results. Our team uses tools like self leveling compound, DPM sealers, and plywood boards to fix that.
We prepare your surface the right way before any floor goes in.

What We Include
- - DPM sealing to block moisture
- - Self leveling concrete over concrete
- - Plywood and chipboard overlays
- - Soundproof mats for busy areas
- - Hardwood floor subfloor prep
- - Karndean subfloor preparation
- - LVP subfloor prep
- - Preparing subfloor for laminate flooring

Floor Types We Support
We adjust based on your flooring.
- Preparing subfloor for laminate flooring means flat, dry, and clean surfaces.
- LVP subfloor prep must be smooth so planks stay in place.
- Karndean subfloor preparation needs high detail and approved layers.
Whether it’s concrete subfloor prep or wood, we match the right method to your space.
You’ll get a clean, ready surface — no guesswork.
DIY vs Professional Subfloor Preparation?
DIY Subfloor Prep
- Budget-friendly
- Time-consuming and physically demanding
- Risk of uneven leveling or moisture problems
- May void flooring warranty if not done right
Professional Prep (ROI Flooring)
- Guaranteed level and dry surface
- Fast, clean, and code-compliant
- Suitable for all flooring types
- Includes DPM, acoustic, and other compounds
Our Subfloor Preparation Procedure
-
Step 1: Subfloor Assessment
We inspect your subfloor for cracks, dips, moisture, or uneven surfaces before starting. This ensures the correct subfloor preparation method is used. -
Step 2: Moisture Testing & DPM Application
If required, we apply a damp-proof membrane (DPM) to protect your new flooring from moisture. This is critical in concrete subfloor prep. -
Step 3: Surface Leveling
We apply high-quality self leveling compound over concrete or wooden bases to eliminate bumps and low spots. -
Step 4: Overlay with Plywood or Chipboards
For wood floors or floating installations, we install plywood sheets or acoustic chipboards to create a stable base. -
Step 5: Soundproofing (Optional)
For flats or upper floors, we can add acoustic underlay or soundproof mats as part of the subfloor prep. -
Step 6: Final Prep for Floor Type
We finalize the surface depending on your flooring choice — whether it’s LVP, laminate, Karndean, or engineered wood.
Fully Insured. Guaranteed Work.
Every flooring project is covered by our public liability insurance. We offer full guarantees on materials and workmanship. Clients trust ROI Flooring because we don’t just deliver quality — we stand behind it.
Testimonials
Trusted Across London
EXCELLENT
Based on 38 reviews
Posted on Google![]()
AmandaTrustindex verifies that the original source of the review is Google.
I have had so many trades people in my house over the past of renovating. These guys are heads and shoulders above all the other. From helping my elderly dad, offering to transport things in there van. All that aside, the standard of work is exceptional, they are timely and tidy. Even my dad was impressed, they arrive they work, they finish and you pay. Absolutely delightfulPosted on Google![]()
Kathalina TaylorTrustindex verifies that the original source of the review is Google.
Today was in dire straits as my grandson accodemtly got locked out of his bedroom and could not get it open Thankfully asked this young gentleman for his help and with the aid of his colleague got the door open Mine you theywere not meant to be working today. I am so ever gratefulPosted on Google![]()
sandeep kaurTrustindex verifies that the original source of the review is Google.
Really glad I went with Granit and his team to do quite a complex floating floor and staircase installation. They did a beautiful job and they were really easy to work with. They really helped take the stress out of the renovation by being solution oriented at all times. I’d recommend them to anyone!Posted on Google![]()
Andy MargessonTrustindex verifies that the original source of the review is Google.
I’m really impressed with the work done on our new floors. They handled four rooms and the hallway seamlessly. What stood out most was the team's efficiency and courtesy; they were helpful at every turn and worked with impressive speed amd professionalism. The flooring look stunnin and we are thrilled with the transformationPosted on Google![]()
Alex DyerTrustindex verifies that the original source of the review is Google.
Unbelievable service and quality of finish. The guys finished the job quickly, professionally and exactly how I wanted. I needed a few extra things done and the guys done it without hesitation. Will always be the first people I go to for flooring thank you so much!Posted on Google![]()
CarolTrustindex verifies that the original source of the review is Google.
I am very happy with the work completed. Granit and his team was helpful in finding me suitable wood flooring for my bedrooms and worked quickly to complete the job This is the second time that I have contacted the company to complete work in my house and love their polite and professional approach and attention to detail. I would recommend them to othersPosted on Google![]()
Fane MensahTrustindex verifies that the original source of the review is Google.
Super happy with our new floors, great experience, very quick turnaround, great and very efficient team. The end result is amazing! Would definitely recommend.Posted on Google![]()
Elio ZukTrustindex verifies that the original source of the review is Google.
We went with ROI as it was a local business and were really happy with the results. We booked tony to match a few holes in our floor and it's turned out seamless.Posted on Google![]()
Ferhat TurjakaTrustindex verifies that the original source of the review is Google.
I am very impressed Excellent work . Granit was very professional helping me with all information , and his team did excellent work .l am very impressed with the service and work. I will definitely recommend Roi Flooring.Posted on Google![]()
Sivan EinsteinTrustindex verifies that the original source of the review is Google.
Professional and trust worthy! Superb service!
Free Subfloor Check
Your new floor needs a solid base.
We’ll check your subfloor for free and tell you what’s needed.
Our subfloor preparation services are fast, clean, and done right.