Your family is growing. Your needs have changed. You want more space without moving. A well-built extension is the smartest investment you can make in your existing home — and we build them with fixed prices, no surprises and a 6-month warranty.
The most common extension in Ghana. Add one or two bedrooms to an existing house — ground floor extension or first floor addition — with full structural integration and matching finish.
Build upward and double your living space. We assess your existing foundation and structure, specify what's needed to support the extra floor, and build it properly from the slab up.
Extend your kitchen into the compound or create an open-plan living area. Full MEP integration, matching finishes and weathertight connections to your existing structure.
Add covered parking to your property. Attached or detached, with automated gate options. We match the architectural style of your existing house.
A separate accommodation unit on your compound. Self-contained with bathroom and kitchenette, or basic room — built to the same quality standard as your main house.
Add a shop, office or workspace to your residential property. We handle planning coordination, structural design and full build — turning your compound into an income-generating asset.
In Accra's property market, moving to a bigger house means paying a significant premium — in purchase price, agent fees and transfer costs. A well-executed extension typically costs 40–60% less than upgrading to a larger property and gives you exactly the space you want, where you already live.
Done properly, an extension also adds measurable value to your property — often more than it costs to build.
We assess your property and give you a fixed-price quote within 48 hours.
A single-room ground floor extension typically costs GHS 30,000–80,000 depending on size and finish. A full additional floor on a 3-bedroom house can range from GHS 120,000–280,000+. We provide a fixed-price quote after assessing your existing structure and your requirements.
In most cases, yes — extensions require a building permit from your local assembly. We advise you on what's needed, but permits must be applied for by the property owner. We can connect you with an architect who handles permit drawings in Ghana.
We make every effort to match materials, render, paint colour and architectural features to your existing building. We'll show you material samples before ordering and keep you involved in finish decisions throughout.
Yes — and we do it regularly. We work in a way that minimises dust, noise and disruption to your household. For major structural connections (like opening up a wall), we schedule those for weekends or when you're away to reduce disruption.
| Extension Type | Q2 2026 Range (GHS) | Typical Timeline |
|---|---|---|
| Single-room addition (standard finish) | GHS 65,000–130,000 | 8–14 weeks |
| Full floor addition (2-bed, above existing) | GHS 280,000–520,000 | 4–7 months |
| Boys' quarters / staff accommodation | GHS 95,000–180,000 | 10–16 weeks |
| Kitchen extension | GHS 80,000–160,000 | 8–12 weeks |
| Garage (single, with roller door) | GHS 55,000–110,000 | 6–10 weeks |
| Veranda / covered outdoor area | GHS 35,000–75,000 | 4–7 weeks |
Yes — in most cases. Any extension that increases the footprint of your building, adds a storey, or involves structural changes to the existing structure requires a building permit amendment from your district or metropolitan assembly. The existing approved drawings must be updated to show the proposed extension, and a new permit issued before work begins.
Minor internal renovations (repainting, retiling, replacing fittings) that do not change the building's structural or external envelope typically do not require a permit. If in doubt, check with your local assembly's physical planning department before starting.
Adding a second floor above an existing single-storey structure is the most structurally complex type of extension. The existing columns, foundations, and ground-floor slab must be assessed by a structural engineer before any work begins. Many Ghanaian residential buildings were not designed to carry an additional floor — adding one without engineering assessment risks structural failure. We commission a structural assessment as the first step on any storey-addition project.
Yes — a boys' quarters is an additional structure within the plot boundary and requires a building permit amendment showing the new structure. The amendment must be applied for before construction begins. Unpermitted structures can be subject to demolition orders.
Possibly — but only after a structural engineer has assessed whether the existing foundation and ground floor structure were designed to carry a second floor. Many Ghanaian residential buildings were not. A structural assessment (GHS 8,000–18,000) is mandatory before any second-storey addition project begins.
This depends heavily on the extension type and location. A boys' quarters in a high-rental-demand area like East Legon may add GHS 100,000–200,000 to rental yield and capital value for a build cost of GHS 95,000–180,000 — positive equity. In a lower-demand corridor, the same extension may add less than its build cost. Always compare the extension cost against the likely value added before proceeding.
Make sure you have the right information before committing to any construction project in Ghana. These are our most-read guides:
We visit your plot at no charge and no obligation. During the site visit we assess soil conditions (critical for foundation type and cost), confirm plot dimensions, evaluate access for materials delivery, and identify any site-specific constraints that will affect the build. This visit is what makes our quote accurate rather than estimated — and it costs you nothing.
Your quote lists every material item (quantity and unit cost), every labour operation, supervision, professional fees, permit fees, and contingency — separately. You can compare every line against current market prices. We do not use lump-sum estimates. Transparency is how we earn trust and verify value simultaneously.
Once you are ready to proceed, we sign a fixed-price construction contract before any money changes hands. The contract specifies: the complete scope of work; the fixed contract sum; the payment schedule (tied to milestones, not dates); the completion timeline; and a 6-month workmanship warranty. The price in the contract is the price you pay — it cannot be changed without a signed change order agreed by both parties.
Your crew is assigned exclusively to your project — not shared across four or five other sites. Each day, your dedicated project manager sends WhatsApp site photographs from the build. This is particularly important for diaspora clients who cannot visit the site regularly — you see exactly what is being built, at what stage, in real time. If any issue arises on site, you hear from us before it becomes a problem.
Payments are released against verified construction milestones, not against calendar dates. Our standard residential schedule: 30% on contract signing and site mobilisation; 40% on completion of structural works (foundation, walling, slab, and roofing); 30% on practical completion and handover. You do not pay for the next phase until the previous phase is confirmed complete — protecting your money throughout the project.
Every Cornerstone project carries a 6-month written workmanship warranty from handover date. Any defect in our workmanship — cracked plaster, roof leak at a junction we installed, failing tile adhesion, faulty fitting — is corrected at our cost within the warranty period. We provide this warranty in writing because we are confident in our work. We can also provide references from clients who have tested the warranty and confirm it was honoured without dispute.
A Cornerstone extension is built to last, priced fairly and delivered with a 6-month warranty. Find out what your extension will cost — free site visit, no obligation.
Get My Extension Quote 💬 WhatsApp KwakuCornerstone Build Ghana is a licensed construction company serving Greater Accra and beyond — residential, commercial, renovation, and civil works. We are classified under Ghana's contractor registration scheme and can provide our certificate on request.
Our fixed-price approach means the number in your contract is the number you pay. We do not request additional funds mid-build without a signed change order. Our dedicated crew works exclusively on your project until completion, supported by daily WhatsApp site photographs and a 6-month workmanship warranty from handover.