Mr. ID leads for full-service projects where one team manages design, windows, and waterproofing. Sparrow Studio is the runner-up for tight HDB spaces needing clever layout planning. EHKA Studio handles complex condo geometries and facade restrictions effectively.
How we picked this list
We assembled this shortlist through desk research across public sources, checking that every website resolves and the business is trading. We ranked them on the criteria below, focusing on portfolio evidence, approval awareness, and waterproofing sequencing. No placements are paid. We did not visit sites, phone businesses, or test materials firsthand.
Table of contents
- How we picked this list
- Introduction
- Quick picks
- Comparison table
- The list
- 1. Mr. ID
- 2. Sparrow Studio
- 3. EHKA Studio
- 4. The Scientist
- 5. Fifth Avenue Interior
- 6. Rezt and Relax Interior
- 7. Ovon Design
- 8. Met Interior
- 9. Studio Juju
- 10. D’Pergola Construction
- How to choose
- FAQ
Introduction
Many homeowners assume balcony enclosure is just adding a window. It is not. Closing a balcony involves wind load, rain splashback, and the transition between old concrete and new frames. You are trying to decide who can manage the wet work, the glass, and the approvals without leaving you with a stop work order. It is hard because a window contractor may not handle design, while a designer may not manage waterproofing. We looked for firms that bridge that gap.
Quick picks
Choose Mr. ID if you want one contract covering design, windows, and waterproofing. Choose Sparrow Studio on a tighter budget for a small HDB balcony. Choose EHKA Studio for odd condo geometry or facade restrictions.
Comparison table
| Business | Best for | Price band | Area |
|---|---|---|---|
| Mr. ID | Whole flat renovations | Not stated | Not stated |
| Sparrow Studio | Small HDB balconies | Not stated | Not stated |
| EHKA Studio | Odd condo geometry | Not stated | Not stated |
| The Scientist | Styled balcony interiors | Not stated | Not stated |
| Fifth Avenue Interior | Multi-room renovations | Not stated | Not stated |
| Rezt and Relax Interior | Condo paperwork management | Not stated | Not stated |
| Ovon Design | Waterproofing repairs | Not stated | Not stated |
| Met Interior | BTO joinery | Not stated | Not stated |
| Studio Juju | Light refresh work | Not stated | Not stated |
| D’Pergola Construction | Landed terraces | Not stated | Not stated |
The list
1. Mr. ID
Mr. ID runs residential projects from design to handover, coordinating aluminium window firms, waterproofing, and tiling on one timeline. For an enclosed balcony, the team plans the interior layout first, then brings in window installation before final painting and flooring. This single-contract approach suits homeowners who want to avoid juggling multiple trades.
What’s good
- One main contract, one project schedule
- Site supervision covers wet work and window installation
- Good for jobs combining lights, flooring, joinery, and enclosure
What to watch
- Balcony window work is usually subcontractor work, so ask who the actual installer is
- Not the cheapest route for a simple window replacement
Who it suits
Homeowners doing a whole flat or condo renovation where the balcony must match the living room. If you only need a window swap, look elsewhere.
Price
Not stated
Details
Name: Mr. ID
Website: https://www.mrid.com
Area: Not stated
2. Sparrow Studio
Sparrow Studio is an interior design practice known for space-efficient layouts in HDB and compact condos. Its balcony work makes the space useful as a study, laundry corner, or dining nook, with joinery planned around window frames. The team pays close attention to rain splashback and natural light before closing walls in.
What’s good
- Design-led approach rather than simple window quoting
- Good space planning for narrow balcony widths
- Pays attention to natural light and ventilation before closing walls in
What to watch
- May not offer its own window installation line
- Not set up for urgent waterproofing repairs
Who it suits
Small HDB or shoebox condo balcony owners who need double-duty space. If you need structural work, look elsewhere.
Price
Not stated
Details
Name: Sparrow Studio
Website: https://www.sparrow.com
Area: Not stated
3. EHKA Studio
EHKA Studio is an architecture-led practice with experience in unusual layouts. It treats a balcony as part of the building facade, considering how a new enclosure meets the existing parapet, floor slab, and neighbour visibility. This is useful when standard window sizes will not fit.
What’s good
- Clearer drawings for the window contractor
- Looks at cross-ventilation rather than sealing the balcony blindly
- Strong on integration between structure, glazing, and interior finishes
What to watch
- Design fees can be high for a small balcony scope
- More process than a single trade contractor
Who it suits
Condo and landed house owners with odd balcony geometry or facade restrictions. If you want a quick, cheap fix, look elsewhere.
Price
Not stated
Details
Name: EHKA Studio
Website: https://www.ehka.net
Area: Not stated
4. The Scientist
The Scientist is an interior design studio with a strong material palette. Balcony projects include patterned tiles, timber screens, folding glass panels, and layers of lighting, turning the outdoor room into a designed interior space. The team coordinates with window and shading specialists for a polished result.
What’s good
- Cohesive material choices between indoor and balcony
- Open to bolder colours and cladding
- Can coordinate with window and shading specialists
What to watch
- May not have a direct window supply arrangement
- Quality comes with a higher cost per square foot
Who it suits
Homeowners who want the balcony to feel like a styled room. If you need practical, low-maintenance work, look elsewhere.
Price
Not stated
Details
Name: The Scientist
Website: https://www.scientist.sg
Area: Not stated
5. Fifth Avenue Interior
Fifth Avenue Interior is a full-service interior design firm for landed homes, condos, and HDB. Its balcony scope covers new flooring, ceiling treatment, electrical points, planter boxes, and window screening as part of a larger renovation. The firm has an established project management flow.
What’s good
- Established project management flow
- Can bundle balcony works with kitchen, bathroom, and living area
- Regular subcontractor relationships for glazing and metal work
What to watch
- Standalone balcony quotes may not interest a full-service ID firm
- Check the itemised quote for separate window and disposal charges
Who it suits
Homeowners renovating multiple rooms at once. If you only want a balcony refresh, look elsewhere.
Price
Not stated
Details
Name: Fifth Avenue Interior
Website: https://www.fifthavenue.com.sg
Area: Not stated
6. Rezt and Relax Interior
Rezt and Relax Interior is an interior design and renovation practice with a reputation for detailed project coordination. For condo balconies, the team handles MCST paperwork, waterproofing approval, and the sequence between tiling, window frames, and facade reinstatement.
What’s good
- Coordination across multiple approvals
- Methodical site schedule for wet areas
- Good for balconies next to bedrooms where noise and dust control matter
What to watch
- Verify which window system is offered for your condo storey height
- Confirm balcony enclosure experience in the portfolio
Who it suits
Condo owners who need a practical contractor to manage submission paperwork. If you need pure design, look elsewhere.
Price
Not stated
Details
Name: Rezt and Relax Interior
Area: Not stated
7. Ovon Design
Ovon Design is a renovation contractor with combined interior design services. It handles practical balcony fitouts including floor screed, waterproofing membrane, glass panel partitions, and custom planter casing. The focus is on practical layouts rather than expensive styling.
What’s good
- Can oversee both waterproofing and tiling
- Useful for making balcony level match the living room floor
- Focus on practical layouts rather than expensive styling
What to watch
- Portfolio quality changes from site to site, ask for recent balcony photos
- Confirm membrane brand and warranty period in writing
Who it suits
HDB and older condo owners where the balcony floor is uneven or waterproofing has worn out. If you want high-end design, look elsewhere.
Price
Not stated
Details
Name: Ovon Design
Area: Not stated
8. Met Interior
Met Interior is an interior design firm that works with mid-range renovation budgets. Its balcony projects often include built-in storage, sliding window systems, and easy-to-clean floor finishes suited to open-air conditions. The team is practical about rain, sun, and cleaning.
What’s good
- Strong joinery planning for narrow balcony spaces
- Practical about rain, sun, and cleaning
- Can include pull-down drying racks and storage benches
What to watch
- Confirm that wood-based joinery is treated or shielded from direct rain
- Not a specialist glass house contractor
Who it suits
BTO and resale HDB owners who need clean, low-maintenance balcony joinery. If you need complex structural work, look elsewhere.
Price
Not stated
Details
Name: Met Interior
Website: https://www.metinterior.com.sg
Area: Not stated
9. Studio Juju
Studio Juju is an interior design studio with a softer, residential approach. It handles balcony refresh work such as replacement floor tiles, paint, planters, screens, and integrated seating, often without heavy structural change.
What’s good
- Good styling sense for small outdoor rooms
- Can propose screen systems that keep views while cutting glare
- Works well with natural materials
What to watch
- Not the right first call for structural enclosure or window installation
- Scope should be reviewed carefully to avoid design-only fees
Who it suits
Owners who like plants, textiles, and relaxed living spaces. If you need full enclosure, look elsewhere.
Price
Not stated
Details
Name: Studio Juju
Website: https://www.juju.co
Area: Not stated
10. D’Pergola Construction
D’Pergola Construction is an outdoor construction company working on beams, pergolas, screens, and patio covers. It is more relevant to landed balconies, roof terraces, and courtyards than to HDB high-rise balcony windows.
What’s good
- Familiar with outdoor structure work
- Can handle metal, timber, and polycarbonate roofing
- Useful when balcony work becomes a small building job
What to watch
- Landed scope may not be approved for HDB or condo use
- Confirm whether the work needs a building plan from a professional engineer
Who it suits
Landed property owners adding shelter, railing, or screen systems over an open terrace. If you have an HDB or condo, look elsewhere.
Price
Not stated
Details
Name: D’Pergola Construction
Area: Not stated
How to choose
| Criterion | Why it matters | What good looks like |
|---|---|---|
| Portfolio evidence | Closing a balcony involves wind load and rain splashback | Photos of frame joints, flashing, and drainage details |
| Approval awareness | Balcony enclosure may touch facade rules and MCST guidelines | Contractor asks about flat type and management rules before quoting |
| Waterproofing sequence | Leaks start when frames are fixed before waterproofing | Clear sequence: concrete repair, membrane, water test, then frames |
| Window specification | Cheap glass can bow or vibrate in high-rise balconies | Quotation names aluminium series, glass thickness, and safety zones |
| Transparent line items | Costs grow with disposal, waterproofing, and access | Breakdown separates permit fees, materials, labour, and disposal |
| Site safety | Work on an exposed balcony is above public areas | Proper edge protection, debris nets, and rain plan |
| After care | Waterproofing faults appear after heavy rain | Written warranty covering membrane and window installation |
If you are planning other parts of your home, check our guide on home renovation for broader context. For specific HDB constraints, see our HDB category.
FAQ
Can I fully enclose an HDB balcony with sliding windows?
Yes, but you must check HDB guidelines and your block’s rules. Some blocks allow enclosure, while others restrict it to preserve facade uniformity. You need to submit plans and get approval before starting work. If approved, use a contractor familiar with HDB window requirements. Always confirm the final design with HDB to avoid a stop work order.
How much does a balcony enclosure plus renovation cost in Singapore?
Expect to pay between SGD 5,000 and SGD 15,000 for a standard HDB balcony enclosure with basic renovation. Costs depend on the size of the balcony, the type of windows, and the complexity of the waterproofing. Condo balconies may cost more due to MCST approval and higher-spec glass. Get at least three itemised quotes to compare line items.
Do I need MCST approval before enclosing a condo balcony?
Yes, most condos require MCST approval for balcony enclosure. You must submit drawings and a work plan to the management corporation. The MCST will check if the design affects the building facade and structural integrity. Approval can take two to four weeks. Without it, you risk being ordered to remove the enclosure.
Should I pick an interior design firm or a window contractor for a balcony renovation?
Pick an interior design firm if you want the balcony to match the rest of your home. They can manage the overall look and coordinate with window specialists. If you only need a functional enclosure with no design input, a window contractor may be cheaper. For most homeowners, a design firm offers better value because they handle approvals and sequencing. Avoid splitting the job between two uncoordinated trades.
How do I check if the balcony enclosure contractor is approved or registered?
Check if the contractor is registered with the Building and Construction Authority (BCA) for larger projects. For smaller works, ask for their business registration and insurance coverage. Request references from recent balcony projects and verify the details. Ask who will actually install the windows and waterproofing. A reputable firm will provide a written warranty and a named contact for aftercare.
