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Granny Flat Construction Guide

PJ Cook
Peter Cook

Step-By-Step Guide On How Long Does It Takes To Build A Granny Flat

The time it takes to build a granny flat can vary depending on several factors, but generally, it can take anywhere from 12 to 24 weeks. When asking, “How long does it take to build a granny flat,” the timeline will depend on the complexity of the design, the materials used, and the efficiency of the construction team. Simple, pre-designed modular granny flats can be completed more quickly, often within 3 to 6 months, while custom-built options or those requiring significant site preparation might take longer. Other factors, such as obtaining permits and addressing unforeseen challenges during construction, can influence the overall timeline.

One of the best things about partnering with P J Cook Building is that we manage the entire process. We manage everything from the initial quote to design, planning, approvals, and construction.

You can count on our industry knowledge and 22-year track record for a smooth process and enjoyable building experience.

Below is a guide to our Granny Flat construction program.

WEEK 1

  • Site establishment consisting of temporary fencing, signage, toilet, sediment controls, temporary power, water, site documents, surveyor building set-out and waste facilities.
  • Site cut and concrete peering to slab area.

WEEK 2

  • Plumbing drainage rough-in within slab area.
  • Electrical and data slab conduits.
  • Termite protection to all slab pipe penetrations.
  • Slab and footings form work, steel, pods, placement of footings and concrete slabs.
  • Slab cure and termite protection to perimeter of slab area.

WEEK 3

  • Wall and roof framing.
  • Metal fascia, gutter, and roofing.

WEEK 4

  • Building fabric vapour permeable membrane, windows, door frames, brickwork or cladding, eave linings and external doors.

WEEK 5

  • Plumber to complete water and gas rough-in along with stormwater, downpipes and any other external connections.
  • Electrical and AC rough-ins.
  • Carpenter pre-sheet frame checks.
  • Site clean.
  • Supervisor completes frame, rough-in and lock up stage quality control checks prior to linings.

WEEK 6

  • Wall and ceiling insulation.
  • Plasterboard linings.

WEEK 7

  • Waterproofing over concrete substrate to comply with AS3740:2021.
  • Tilers sand and cement screed.

WEEK 8

  • Waterproofing over sand and cement screed for additional quality assurance and extended warranty on waterproofing membrane.
  • Painter seals around windows, doors, pipe and cable penetrations with Sikaflex – standard P J Cook quality procedure.
  • External painting.

WEEK 9

  • Floor tiling and grouting.
  • Laundry tub installation.
  • Vanity, kitchen and laundry joinery installation.
  • Fix out, consisting of doors, architraves, skirting and wardrobe reveals.
  • Stone bench top check measure.

WEEK 10

  • Wall tiling and grouting.
  • Wardrobe, linen, shower screen and mirror check measures.
  • New meters and main switchboard upgrades.

WEEK 11

  • Painter applies internal sealer coat.
  • Pre-paint checks by supervisor to light standard.
  • Plasterers rectify any minor omissions identified by site supervisor prior to painting.
  • Painter to re-seal patches plasterer patched.
  • Start internal painting

WEEK 12

  • Finish internal painting excluding last coats to main areas.
  • Stone bench top installation.

WEEK 13

  • Kitchen splash back tiling and grouting.
  • Electrical fit off, test and commission.
  • Plumbing fit-off, test and commission.
  • AC fit-off, test and commission.
  • Wardrobes and linen joinery installation.

WEEK 14

  • Vinyl floor preparation and installation.
  • Carpet floor preparation and installation.
  • Fit off door hardware, wet area accessories, cover plates and complete final checks.
  • Painter complete last coats to main area walls and skirting.

WEEK 15

  • Internal pre-clean.
  • Supervisor completes final defect list and paint mark-up to light standard.
  • External site clean.

WEEK 16

  • Finalise any minor omissions.
  • Painter to complete any final touch ups following supervisors mark up with light.

WEEK 17

  • Caulking contractor silicones around perimeter of skirting of main area floors, around kitchen kickboards, joinery, bathroom, ensuite, laundry and WC areas standard P J Cook quality procedure for sleek minimalistic look.
  • Shower screen and mirror installation.
  • Final professional clean.

WEEK 18

  • Supervisor and maintenance team complete one final check and rectify any minor omissions (if any).
  • Practical completion and final accounts.
  • Client offered final walk-through with site supervisor or P J Cook representative prior to handover.

Once the final walk through is complete and all accounts have been settled, a member of our team will contact you to arrange a convenient time for the formal handover of your granny flat onsite. The above timeline serves as a guide only. It is based on a single-storey, two-bedroom granny flat built on a slab with no delays. However, project timelines can vary due to factors such as the selected inclusions, construction method, weather conditions, material availability, project complexity, site conditions, and any unforeseen delays. At P J Cook Building, Peter Cook, his team, and trusted subcontractors are dedicated to completing every project on time and within budget. Communication plays a pivotal role in this process, and we ensure you are kept informed at every stage. We never sacrifice quality for cost or rush projects to meet deadlines. While we are capable of building as quickly as any other builder, we believe that quality craftsmanship requires time, care, and attention to detail.

Cutting corners to meet deadlines compromises the integrity of the build and could lead to costly issues later. At P J Cook Building, we prioritise excellent building practices to deliver a high-quality result that lasts. Our standard inclusions surpass those of most builders, reflecting our focus on craftsmanship rather than volume. While some builders may promise quick builds or low prices, we urge you to look beyond these factors. Quality should always come first. Our higher pricing reflects the time, care, and skilled work we invest in creating a superior product. To ensure every project receives our full attention, we limit the number of site starts each month, This approach allows us to maintain our commitment to unparalleled quality and industry-leading standards. The result is a granny flat that stands out from the rest and offers the best possible return on investment. If you are unsure which builder to choose, we invite you to inspect one of our completed projects and speak to our recent clients. We are confident that this experience will reassure you that partnering with P J Cook Building is the right decision for your journey.

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