Here are reputable options and practical next steps for custom interior design services in Bangalore, grouped by type so you can pick what fits your needs and budget.

Boutique / design-led studios (best if you want highly original, architecture-driven or artisanal work)

• Khosla Associates — established architecture + interiors practice in Bangalore known for award‑winning residential and hospitality projects; good for high‑quality, contextual design. (khoslaassociates.com)
• The Purple Ink Studio — Bangalore-based studio with strong portfolio of experimental, material-driven residential and commercial interiors; good if you want craft-forward, sustainable finishes. (thepurpleinkstudio.com)

Full-service national brands (good for end‑to‑end project management, modular solutions, predictable timelines)

• Livspace — national full‑service interiors firm with multiple Bangalore experience centres; publishes approximate package starting prices (example: 2BHK from ~₹3.57 Lakh; full-home timelines/move‑in guarantees on their site). If you value a single vendor for design + supply + installation, this is a common choice. (Livspace.com)
• Design Cafe — national interior studio with Bangalore projects and experience centres; mixed reviews online (some clients praise design and process; others report delays), so check recent local references before committing. (Houzz.com)

Smaller/local firms and contractors (best for mid-range budgets, heavy customization, or local craft)

• Lotus Studio (Lotus Studio Interiors) — Bangalore-headquartered firm offering end-to-end residential and commercial interiors and MEP/structural support; suitable for projects needing strong onsite execution. (designatlotusstudio.com)
• Independent/local designers — many excellent solo designers or small teams in Indiranagar/Whitefield/Jayanagar who can deliver very personalized interiors at a range of per‑sqft rates (search local portfolios on Instagram, Houzz, or ArchDaily/DesignBoom for examples).

How they typically price (what to expect)

• Branded turnkey firms publish package-style starting prices (examples: Livspace lists 2BHK ~₹3.57L, 3BHK ~₹4.23L; single-room packages also published). Boutique studios often price by scope and quality — commonly quoted as a per‑sqft design + execution range that depends on finishes and custom joinery. Always ask for a detailed scope and a breakdown of materials vs labour. (Livspace.com)

How to choose and hire (practical checklist)

1. Define scope: full home vs selected rooms, approximate carpet area, and must‑have items (kitchen, wardrobes, A/V, lighting, smart features).
2. Compare portfolios: ask for 3 recent projects similar in scale/style and request client references (especially for timelines, punchlist response and warranty).
3. Get itemized quotes: require line‑item estimates (civil works, modular units, painting, electrical/MEP, carpenter, plumbing, GST) and a realistic timeline with milestones.
4. Contract & warranty: sign an agreement covering deliverables, payment schedule linked to milestones, defect liability period and post‑handover service.
5. Site monitoring: either the firm should include project management or hire an independent project lead to avoid delays/cost overruns.

Quick next steps you can do right now

• Shortlist 3 firms from above based on style (e.g., Khosla / Purple Ink for design‑forward; Livspace / Design Cafe for turnkey; Lotus Studio for local execution).
• Share your basic brief (floor plan, photos, budget range, timeline) and request a free/paid site visit + estimate.
• Ask each shortlisted firm for: a) proposed concept board (mood + layout), b) itemized estimate, c) firm references and d) expected timeline.

If you want, I can:

• Narrow this to 4–6 firms focused only in a specific Bangalore neighbourhood (e.g., Indiranagar, HSR, Whitefield).
• Draft an email/brief you can send to designers with the exact info to get comparable quotes.

Would you like me to prepare a short message/brief you can send to these studios, or narrow recommendations by neighbourhood or budget?