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Coldicutt Blackman builders stripping out a ceiling during a renovation

Complex renovation specialists · Auckland & Rodney

Complex renovationsWithout thesleepless nights.

Rotten framing, structural changes, old homes full of surprises. They're the jobs other builders price high or walk away from, and the ones we do best. You get one detailed itemised price, a director on every job, and nothing built that you haven't approved.

Licensed Building PractitionersNZ Certified BuildersHalo 10-year guaranteeA director on every jobItemised pricingAuckland & Rodney

01Who we are

We're Coldicutt Blackman, renovation specialists across Auckland and Rodney. The older the house and the harder the job, the better we like it. You get an itemised price, a director on every job, and the freedom to sleep well while we work.

Samuel ColdicuttCo-principal
Jeremy BlackmanCo-principal

02How a renovation runs

From strip-out
to sleep well

Renovations are where building horror stories start. Ours run the same way every time, so you always know what's happening, what it costs and what comes next.

Builder opening up an old wall Builder inspecting exposed framing Builder working on a villa's foundations Finished kitchen renovation with timber battens and marble
01 / 04Open up
Builder opening up an old wall
Step 01

We open up carefully

Old homes hide rot, bad repairs and framing that was never right. We strip out in stages and look properly before anything gets covered back up.

Builder inspecting exposed framing
Step 02

We show you, then price it

Found something? You see it, with photos and a plain explanation, and a price to fix it. Nothing extra gets built until you've said yes.

Builder working on a villa's foundations
Step 03

We fix it properly

Structure, weathertightness and the details you'll never see are done to the standard we'd want in our own homes.

Finished kitchen renovation with timber battens and marble
Step 04

You get your home back

A tidy site, a finished renovation, and the paperwork and guarantees to back it.

01 / 04 · Open up
A renovation mid strip-out, with steel props holding up a new beam A finished kitchen renovation with dark timber battens and a marble benchtop

Every renovation

Starts in
the mess.
Ends here.

Mid-renovationFinished

Two of our renovations: one mid strip-out, one handed over.

03What we build

Renovation first. The harder, the better.

04Our standard

You won't hear a Coldicutt Blackman carpenter say "you can't see it from my house."

Too much building work stops at what the client can see. Ours doesn't. The framing, fixings and flashings behind your linings get the same care as the finished surfaces, because that's what decides whether your home lasts.

Take our stairs. We combine full timber stringers, routed for the treads, with sawtooth stringers. Strong, quiet underfoot, and right even from underneath.

The underside of a Coldicutt Blackman stair Full stringer, routed for the treads Sawtooth stringer
Our hybrid stringer detail, seen from below.

05Recent work

Finished properly

Every renovation has a hard bit. Here's what it was on three of ours, how we handled it, and more from site.

Kitchen with timber batten canopy and marble
Kitchen renovation
Curved timber batten wall
Curved batten joinery
Crew backfilling a new timber retaining wall with scoria in the rain
Retaining wall backfill
Built-in bookcase and media wall
Built-in bookcase
Herringbone garden screen
Herringbone screens
Villa being re-levelled
Villa re-level

Case 01 · Remedial renovation · Parakai

Council file
250+ documents reviewed
Weathertightness
Building Code and E2 compliant
Council sign-off
Final sign-off passed, CCC on its way

The brief

These clients came to us with a house that was illegal. It had no code compliance certificate, and nobody could tell them what had been done to it or what it would take to put right.

The hard bit

We pulled the council property file and combed through more than 250 documents. The previous owner had consent for two extensions in 2011, amended in 2020. Nothing he'd built matched the plans or the Building Code, none of it had been inspected, and council knew nothing about it.

We first looked at a certificate of acceptance. Once we opened things up, there were no top plates, the window lintels were wrong and the framing was incorrect, so that route was off the table. We varied our contract, stripped the cladding off that part of the house and redid the work properly. We also found that the four point loads holding up the ridge beam weren't carrying the load down, so we reframed them and had our engineer check them to modern code.

The budget was tight the whole way. One wall turned out to be rotten, and council's usual reclad approach means opening up a metre in every direction from each rotten spot: pulling up floors and ceilings downstairs, and blowing the budget. Instead we brought that end wall into the existing building line as part of the reduced extension, so we could reclad just that wall under the minor variation.

What we did

We had plans drawn for a reduced scope, worked through several on-site meetings with council, and got the minor variation approved, 12 months after our first meeting with the clients. We removed the work that couldn't stay and fixed all the defective workmanship we uncovered.

The mini corrugated cladding had been fixed over square battens instead of castellated ones, which traps water in the cavity and makes the house damp and cold. We took it off, replaced the cavity battens and building paper, and redesigned the flashings around every penetration, which didn't match the consented plans either.

Under the deck, the roof was rusted out and had no fall, so we repitched it to modern standards with new roofing iron to stop water getting in downstairs. New entry stairs now run up and dog-leg back onto the deck to a new front door. When we pulled out the old deck, we found the 135 mm glulam posts another contractor had installed were floating above the ground, not touching their footings. Builders call them "Bluetooth" posts: no connection. Our engineer designed new footings with a new length of post scarfed into each existing one, so we didn't have to replace the whole posts.

The house has four bedrooms and had no storage at all, so we added a false floor and a lower ceiling to create storage cubbies above both bedrooms.

The result

To stay within budget we reused the existing cladding. That comes with some visual compromises, but the house is compliant with the Building Code and E2, and our clients are absolutely wrapped with the work. Council has since given the job its final sign-off, and the code compliance certificate for a house that came to us illegal is on its way.

Got a job like this? Book a site visit
New timber retaining wall and fence with a planter box along the driveway
Retaining wall and fence
Hardwood garden steps between black sleeper walls
Hardwood garden steps
Rangehood detail with timber battens
Rangehood detail
Hardwood deck corner detail
Hardwood deck detail
Library shelving with ladder
Library shelving
Builder fixing new framing on an upstairs extension
New framing
Timber screen panel detail
Screen detail
Laundry with stacked appliances
Laundry
Glazed joinery in a hallway
Glazed joinery

Case 02 · Dual-dwelling conversion

From one house to home and income

On site
2 months
Owners
Lived upstairs throughout
Result
Two self-contained homes

The brief

The house had become too big for the owners, and they wanted it to earn an income.

The hard bit

Two connected homes have to be safe for everyone in them, so every party wall needed passive fire protection retrofitted. Our retirement village work meant we'd done plenty of it.

To open up the downstairs home we removed a large section of load-bearing block wall: we propped the top floor and saw-cut the wall out. Inside the concrete supporting it were live electrical cables, cast in when the house was built, feeding the upstairs home the owners were living in. Every one came out undamaged.

What we did

We split the two-storey house into two homes. Downstairs has its own entrance and parking. Upstairs has the garage, parking and its own front door.

The result

Two homes and a rental income, finished in two months around owners who stayed living there.

Got a job like this? Book a site visit
Kitchen with an oak peninsula, floating shelves and a red feature wall
Kitchen and floating shelves
Hardwood deck path through a garden
Hardwood garden path
Hardwood stairs
Hardwood stairs
Builder pulling out old framing during a strip-out
Demolition

Case 03 · Deck and timber bifold

The window that became a door

Deck
Kwila, half new and half relaid
Door
Custom timber bifold
Aftercare
Split boards replaced free

The brief

The owners wanted the lounge to open straight onto the back garden, with a deck to step out onto.

The hard bit

The ground was full of underground services, so we changed the framing design to work around them. We also found a retention tank and soak pit that weren't on the drainage plans, and adjusted the layout to suit.

Half the deck is brand new and half is the existing deck relaid, so the two had to finish as one.

What we did

We built a low-lying kwila deck and replaced the lounge window with a custom timber bifold door. We opened up the covered verandah onto the deck, arranged artificial turf so the dogs can't dig up the lawn, and transplanted the hedge and mondo grass from where the new deck went. The lounge now opens straight onto the deck and the garden.

After handover

Three weeks after handover, some deck boards split. We went back and replaced every affected board at no charge.

Got a job like this? Book a site visit
Retaining wall and fence running beside a driveway
Driveway retaining wall
New deck and entry stairs above a garden
Deck and entry stairs
Deck with garden screens
Deck & screens
Foundation work
Foundations
Crew stripping out a room back to the framing
Strip-out
Builder working inside new framing
New framing
Irrigation line fixed along a new timber retaining wall
Retaining wall detail
Mini corrugated cladding corner with new downpipe
Cladding corner
Builder barrowing old linings out during a strip-out
Strip-out

06Client reviews

Don't take our
word for it

5.0out of 5

20 Google reviews

Facebook recommendation
“What started with trying to install a bidet toilet in an en-suite, led to a complete internal renovation of our new home in Freemans Bay… Their honesty, integrity and attention to detail is second to none. And the job came in within about 2.5% of their cost estimate.”
SSimon ChinchanwalaFreemans Bay renovation
★★★★★Google review
“Their work has restored a dry peaceful space to relax in… I appreciate the professional approach they take in their work, their ability to negotiate required work with realistic solutions.”
RRaewyn Knowles
★★★★★Google review
“We are exceptionally happy with the final outcome, and the cost. The work carried out is incredible, bordering on OCD, our old rotten wobbly stairs have been replaced by works of art.”
PPhillip Kite
★★★★★Google review
“From a trades point of view, their organisation, communication, and site management are next level… As a client, the experience is just as impressive. The team keeps you informed every step of the way, making the entire process feel stress-free and well managed.”
SSarah CliftonVolt Solutions
★★★★★Google review
“I was impressed with the overall value offered by Coldicutt Blackman… they did a lovely job renovating my home, installing new foundations, new bathroom, roofing, liasing with all the other trades people…”
SSally Lush
★★★★★Google review
“I’m an architect practicing for 30 years… Great attention to detail which every architect likes. Thoughtful builders, hard workers and reasonably priced for the quality.”
JJudy EdenArchitect
★★★★★Google review
“They were great communicators and answered all my silly questions in a way that made sense to me!… Honestly best builders I've worked with.”
DDiva Giles
★★★★★Google review
“They produced new fencing, front deck and other renovations in line with the style and presence of our 100+ year old villa while being open to little hacks for our modern lifestyle…”
NNatalie Stagg
★★★★★Google review
“When the unexpected eventuated he provided several options for us to consider. He went out of his way to help us find solutions.”
SSarah Cox
★★★★★Google review
“From original sight inspection and quote, right through to final wave as they drove away from the finished job, they were easy to talk to, clear with their quotes, and produced exactly what we wanted…”
JJaneen
★★★★★Google review
“Jeremy and Sam were excellent to deal with. High quality work completed in a relatively tight timeframe. They took a very pragmatic approach and I’m really pleased with the outcome. Would use them again for sure.”
CCam Stewart
★★★★★Google review
“They designed us a lovely deck that really utilises the space so well… Jeremy and Sam are incredibly professional and respectful. Always tidying up the site at the end of the day.”
AAbby
★★★★★Google review
“Amazing builders, exceptional communication and a quality finish.”
AAbby Fawcett
★★★★★Google review
“Sam Coldicutt and Jeremy Blackman with apprentice Pete did a wonderful job on our 96 year old Railway Bungalow.”
JJo Mears
★★★★★Google review
“Sam & Jeremy were great, communication was clear, and the finished product was 10/10.”
ZZac Tippins
★★★★★Google review
“Great guys, very professional, great communication, and meticulous attention to detail in their work. Highly recommend.”
KKaaren Holland-Kara
★★★★★Google review
“Jeremy provided a very quick turnaround for a pre purchase inspection! Very happy with the quality of work.”
TTaylor Oades
★★★★★Google review
“He has done a good job with his building work and tidied up after himself. I find him to be honest and had no issues providing him access to my home.”
JJohn Peric
★★★★★Google review
“I found Coldicut Blackman were very professional and delivered what they said. The work quality was very good”
SSteve Wrenn

Word-for-word excerpts from our Google reviews. Read them in full on Google.

07Who you'll deal with

Two builders.
Both on the tools.

Samuel and Jeremy started out as apprentices together, went separate ways to learn the hard end of the trade, then came back to build the company they'd always wanted to hire.

From Kaukapakapa

Samuel Coldicutt

Co-principal. Built his career on complex architectural homes. Known for meticulous attention to detail, and for delivering on time and on budget.

From Helensville

Jeremy Blackman

Co-principal. Came up through high-end commercial construction and specialises in renovation and maintenance, where problem-solving matters more than the plans.

08Free builder's tools

Plan it like a builder

Live · Stair calculator

How many steps?

Full stair calculator
Risers15
Riser height180 mm
Total run3920 mm
Pitch32.7°

A quick estimate. Check the final design against NZ Building Code clause D1, or ask us to.

Calculator

Deck calculator

Size your deck and get board, joist and bearer quantities before you buy timber.

Coming soon

More tools

Consent checker, retaining wall calculator and renovation budget planner.

Not sure where to start

Book a site visit

We come to you, look at the house and talk it through. Pick a weekday and time that suits you.

Pick a time

Already have plans

Price my plans

Upload your drawings and Samuel and Jeremy will review them and send you an indicative price.

Upload plans

Starting from an idea

Design & build

We bring in the designer and engineer and run it all, from first sketch to handover.

Start a project

09Book a site visit

Pick a time.
We'll come to you.

Pick a weekday and a time between 8am and 4pm, then tell us a little about the job. It goes straight to Samuel and Jeremy, and we'll confirm your visit within one working day.

  • Auckland and the Rodney District
  • Renovations, alterations, new builds and repairs
  • Prefer to talk first? Call 027 840 0296
Choose a day and timeWeekdays · 8am to 4pm · from the day after tomorrow

Pick a day and time above.

10Price my plans

Send us your plans.
Get a real price.

Drop in your drawings and Samuel and Jeremy will go through them personally, then send you an indicative price. A builder reads every set, so there's no automated guesswork.

  1. 01Upload your plansArchitectural drawings, sketches or photos of hand-drawn plans all work.
  2. 02Samuel and Jeremy review themWe'll call if anything needs explaining before we price it.
  3. 03You get an indicative priceA clear starting figure to plan around, firmed up once we've seen the site.

    No plans added yet.