NHBRC registered building extensions in Johannesburg. Granny flats, room additions, second storeys and garage conversions. City of Johannesburg council plans included. Written contract, electrical COC and 2-year warranty on every build.
Adding space to your Johannesburg home is one of the best property investments you can make. A granny flat in Sandton generates R7,000 to R14,000 per month. A second storey addition adds immediate resale value. A room addition costs a fraction of moving to a bigger house. The challenge is finding a registered, compliant contractor who handles the City of Johannesburg plan submission, NHBRC enrolment and electrical COC — not just the bricks.
Our main competitors ranking for "building extensions johannesburg" have no NHBRC registration claims, no CIPC numbers, no pricing, no contact forms and no City of Johannesburg plan submission service. The European Carpenter is a carpentry and renovation company — not a dedicated extensions builder. Enza Construction builds hospitals and roads — they are not set up for residential extensions at all.
Why council plans are non-negotiable: Every building extension in Johannesburg — room additions, granny flats, second storeys, garage conversions — requires City of Johannesburg approved building plans. Without approved plans the structure is illegal, cannot be insured, cannot be bonded and the CoJ can order it demolished. Scotch Score Holdings handles the full CoJ plan submission and approval on your behalf at no additional charge.
The granny flat opportunity in Johannesburg North: Sandton, Fourways, Bryanston and Lonehill are among Johannesburg's strongest rental markets. A properly approved 40m² granny flat generates R7,000 to R14,000 per month — an 18% to 25% annual return on the build cost. It must be NHBRC enrolled and CoJ council-approved to be legally occupied and insured. We handle everything.
We build extensions across Sandton, Bryanston, Fourways, Lonehill, Douglasdale, Randburg, Midrand, Hyde Park, Morningside, Sunninghill and the full Johannesburg North area. Every extension starts with a written, itemised contract signed before a cent changes hands.
Granny flats to second storeys, room additions to garage conversions. All NHBRC enrolled, CoJ council-approved and delivered with a written warranty.
CoJ council-approved granny flats in Johannesburg North. NHBRC enrolled — legally occupiable from handover. Generates R7,000 to R14,000 per month rental income in Sandton, Fourways and Bryanston.
Full second storey additions on existing Johannesburg homes. Structural engineer assessment included, CoJ council plans submitted, NHBRC enrolled. Double your living space without moving.
Single room additions and bedroom extensions across Johannesburg North. All sizes from a 15m² home office to a 40m² master bedroom suite. CoJ plans included, NHBRC enrolled, 2-year warranty.
Converting your garage into a flatlet, home office or additional bedroom in Johannesburg. One of the most cost-effective ways to add rentable space to your property. CoJ plans and NHBRC enrolment included.
Extending kitchens and living areas into open-plan layouts across Johannesburg North. Structural assessment included, load-bearing wall removal managed safely, CoJ plans for structural work included.
Full finishes on all extension projects — plastering, tiling, ceiling installation, painting and flooring. We don't hand over a shell. Every Scotch Score extension is finished to move-in ready standard.
All extension prices include CoJ council plans, NHBRC enrolment, electrical COC and plumbing. No hidden extras. Written contract before any work starts.
Prices indicative and subject to site assessment, soil conditions and finishes. Free itemised written quote before any work begins.
European Carpenter is a carpentry company. Enza Construction builds hospitals. Neither has NHBRC registration, CoJ plan submission or a CIPC number on their page. We do — and you can verify everything.
Every new structure and extension is NHBRC enrolled — required for legal occupation, home loan financing and building insurance in South Africa. Verify at nhbrc.org.za.
Full City of Johannesburg council plan submission and approval on your behalf. No extra fees, no chasing officials — we manage the full process from submission to stamp.
Scotch Score Holdings (Pty) Ltd — CIPC: 2025/257893/07. A legally registered company you can verify at cipc.co.za. Not an individual with a website.
Every extension comes with a written two-year workmanship warranty — a signed document at handover, not a verbal promise that disappears.
Full electrical Certificate of Compliance on every extension — required by the City of Johannesburg and all insurers for any new or altered residential structure.
Fully CIDB registered construction company. Verify at cidb.org.za. We comply with all South African construction industry grading and registration requirements.
45 verified Google reviews. NHBRC enrolled builds, CoJ plans handled, full finishes on time and on budget.
"Granny flat in Lonehill — Scotch Score handled everything from CoJ plan submission to NHBRC enrolment. Tenant moved in immediately, fully legal and insured. Generating R9,500 per month. The investment paid for itself in under 4 years."
"Second storey addition in Bryanston. Structural engineer, CoJ plans, NHBRC — Scotch Score managed it all. The process was completely stress-free. Finished on time and on the written quote. The workmanship is excellent."
"Room addition and garage conversion in Fourways. Previous contractor left without finishing — Scotch Score took over, sorted the CoJ plans retrospectively and completed everything properly with a warranty. Should have started with them."
Building extensions in Johannesburg cost from R8,500 per m² for standard spec. A room addition starts from R170,000. A granny flat starts from R340,000. A second storey addition starts from R650,000. All prices include CoJ council plans, NHBRC enrolment, electrical COC and full finishes. Free itemised written quote before any work begins.
Yes — always. Every extension in Johannesburg requires City of Johannesburg approved building plans. Without approved plans the structure is illegal, uninsurable and the CoJ can order it demolished. Scotch Score Holdings handles the full CoJ plan submission and approval on your behalf at no additional charge.
Yes. Any new residential structure including granny flats requires NHBRC enrolment. Without it the structure cannot be legally occupied, insured or bonded. All Scotch Score granny flats are NHBRC enrolled from day one of construction — included in the price at no extra charge.
CoJ plan approval takes 8 to 14 weeks. A room addition takes 6 to 10 weeks to build once plans are approved. A granny flat takes 10 to 16 weeks. A second storey takes 4 to 6 months. Every project includes a written timeline in the contract before work begins.
A granny flat in Johannesburg costs from R340,000 for a 40m² standard spec unit all-inclusive — CoJ plans, NHBRC enrolment, electrical COC, kitchen, bathroom and full finishes. In Sandton and Fourways a properly approved granny flat generates R7,000 to R14,000 per month rental income.
Yes. A second storey requires a structural engineer assessment of the existing foundation and ground floor slab, CoJ council-approved plans and NHBRC enrolment. Scotch Score Holdings handles the full structural engineer assessment, plan submission and NHBRC enrolment. Second storey additions start from R650,000.
Yes. Scotch Score Holdings (Pty) Ltd — CIPC: 2025/257893/07 — is fully NHBRC registered and CIDB registered. Verify at nhbrc.org.za and cidb.org.za. Every extension includes a written two-year workmanship warranty, NHBRC 5-year structural warranty enrolment, electrical COC and plumbing certificate.
We build extensions across Sandton, Bryanston, Fourways, Lonehill, Douglasdale, Randburg, Midrand, Hyde Park, Morningside, Sunninghill, Paulshof, Rivonia, Craigavon, Dainfern and the full Johannesburg North area. We are Sandton-based — Johannesburg North is our home ground.
NHBRC registered extensions across Sandton and all Johannesburg North suburbs.
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CIPC: 2025/257893/07
NHBRC Registered · CIDB Registered
CoJ Plans Included · 2-Year Written Warranty
Scotch Score Holdings is NHBRC registered, CIDB registered and CIPC verified. Every Johannesburg extension includes City of Johannesburg council plans, electrical COC, NHBRC enrolment and a 2-year written warranty. European Carpenter builds kitchens. Enza builds hospitals. We build home extensions — and we do it properly.