Architects & Design-Build: Complete Planning Guide & Checklist (2026)

01What architects & design-build includes

In-house architects in Mumbai and structural engineers so drawings are built exactly as designed.

• Concept & plans
• 3D elevation
• Structural design
• Working drawings
• BOQ
• Site supervision

02Planning checklist

Use this before you sign anything:

• Define budget and must-haves
• Soil test and site survey
• Architectural and structural drawings
• Approvals and NOCs
• BOQ with brands and quantities
• Contract with timeline, penalties and defect liability
• Payment schedule linked to stages

03Common mistakes to avoid

Choosing on the lowest sq.ft. rate, starting without structural drawings, skipping waterproofing, changing design mid-way and paying large advances without milestones are the five mistakes we see most often.

04Quality checks that matter

Concrete cube tests, rebar inspection before every pour, curing for at least 7–14 days, ponding tests for waterproofing, and pressure tests for plumbing should all be documented and shared with you.

05Specification tiers for architectural design and design-build services

At basic tier (closer to 2% of project cost), architectural services cover concept plans, a basic 2D elevation, structural design sufficient for sanction approval, and working drawings adequate for a competent contractor to build from. Site supervision is typically periodic rather than continuous.

At standard tier (roughly 3–4% of project cost), services add a 3D elevation visualisation, a detailed BOQ (bill of quantities) broken down by trade, coordination between architectural and structural drawings to avoid clashes (like a beam running through a planned window opening), and more frequent site visits during critical stages (foundation, each slab casting, and finishing).

At premium tier (5–6% of project cost), expect full interior design integration, detailed MEP coordination drawings, continuous or near-continuous site supervision with a dedicated site architect, and design revisions included for a specified number of iterations rather than charged separately. The real difference between tiers is less about the drawings themselves and more about how much clash-coordination and site-supervision time is included — this is what actually prevents costly on-site rework.

06Worked example: design services for a ₹1.5 crore bungalow project

Take a ₹1.5 crore bungalow construction project with architectural and structural design services contracted at 4% of project cost, roughly ₹6 lakh. Concept design and client feedback iteration typically takes 3–4 weeks, during which the architect produces 2–3 layout options before the client finalises one direction.

3D elevation visualisation and material/colour palette finalisation takes 2–3 weeks, run largely in parallel with structural design, which typically takes 3–4 weeks once the architectural layout is frozen (structural design cannot meaningfully start before the layout is fixed, since column positions depend on room layout).

Working drawings, BOQ preparation and municipal submission documentation together take 3–4 weeks. Once sanction is received (typically 5–8 weeks depending on the authority), site supervision continues through the roughly 9–10 month construction period at a frequency matching the contracted tier. Total design-phase timeline before construction starts: roughly 3–4 months, which should be planned for explicitly rather than assumed to overlap invisibly with construction start dates.

Design-fee payment schedules are usually tied to design-stage deliverables rather than construction progress: a typical structure releases around 20% at engagement and brief sign-off, 25% on concept design and 3D elevation approval, 25% on structural design and working-drawing completion, 15% on BOQ delivery and municipal submission, and the remaining 15% spread across site-supervision visits through the construction period. Because site-supervision fees are often the most loosely tracked part of a design contract, it is worth tying that final 15% to a specific number of documented site visits rather than a vague ongoing retainer.

07Selecting an architectural design partner and structural engineer

For a design-build arrangement where the same firm provides both architecture and structural engineering, ask specifically how structural and architectural drawings are cross-checked against each other before issue for construction — clash-checking is the single most valuable (and most often skipped) step in design coordination, and its absence is the most common cause of expensive site-level rework.

For structural design specifically, confirm that reinforcement detailing follows IS 13920 ductile detailing requirements given Mumbai's seismic zone III classification — this should be explicit in the structural drawing notes, not left implicit. For BOQ preparation, insist on quantities broken down by material grade (concrete grade per member, steel grade, tile brand and size per room) rather than lump-sum trade totals, since a lump-sum BOQ makes it very difficult to compare contractor quotes like-for-like later.

For 3D visualisation, confirm whether the rendering reflects the actual specified materials (not generic stock renders), since a mismatch between rendered visualisation and actual specified material is a common source of client disappointment at handover.

08Readiness checklist before engaging an architectural design team

A few items are worth confirming before design work begins, since they directly shape what the architect can design.

• Plot survey, title documents and any existing structure details handed to the architect before concept design starts
• Applicable development control regulations (DCPR 2034 for Mumbai, or UDCPR for Navi Mumbai/Thane/Panvel/Kalyan-Dombivli/Vasai-Virar) identified for the specific plot location
• Family or client requirements (room count, specific functional needs, future expansion plans) documented in a brief before concept design, not communicated verbally and informally
• Budget range shared honestly with the architect upfront, since design decisions made without a budget constraint often need costly revision later
• Soil investigation commissioned early enough that structural design is not delayed waiting for the report
• Design-stage decisions requiring long-lead materials (large glazing, imported fixtures) identified early so procurement timelines are not a surprise later
• Scope of site-supervision visits (frequency, specific stages covered) agreed in writing as part of the design contract

09Liability and revision terms typical in architectural design contracts

Architectural design contracts typically do not carry a 'defect liability' period in the construction sense, but they should specify a defined number of design revisions included in the fee (commonly 2–3 rounds) before additional revisions are billed separately — without this clause, revision scope can expand indefinitely and strain the client-architect relationship.

Structural design liability is a distinct and more serious matter: the structural engineer typically remains professionally responsible for the structural design's adequacy, and this responsibility should be documented through the engineer's formal certification submitted with the sanction application, which is standard practice and should never be waived.

For site supervision specifically, clarify whether the architect's visits constitute a formal quality sign-off at each stage or a general design-intent check — these are different levels of responsibility, and confusing one for the other has caused real disputes when defects surface after handover and the client assumed site supervision meant something more rigorous than it contractually did.