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Cost to dig and retain bank to build double garage

#Post
1

Has anyone dug out and retained a bank to build a double garage? The council have confirmed it would be possible but I'm wanting to have a ballpark understanding of what the cost might be to help me decide if I make an offer on a house that is for sale.

2real - 2021-01-29 18:27:00
2

$10,749.64 + GST at a guess

stevo2 - 2021-01-29 18:44:00
3
stevo2 wrote:

$10,749.64 + GST at a guess


Naa. go for a cheapie job.

masturbidder - 2021-01-29 19:17:00
4
2real wrote:

...... I'm wanting to have a ballpark understanding of what the cost might be to help me decide if I make an offer on a house that is for sale.

How long is a piece of string....
Oops, sorry, how long is the bank at foot and top?
What is the average height?
What is the soil structure like?
Then there's the Resource Consent, Council permit, possible road signage (for when the concrete trucks arrive)
Engineer's assessment...
Plan drawing, filing with Council....

Jeepers, ask someone in the field, who does this for a living, to do a driveby if you want anything near an accurate "ballpark" figure....

(And then double it....)

Edited by autumnwinds at 7:27 pm, Fri 29 Jan

autumnwinds - 2021-01-29 19:26:00
5
stevo2 wrote:

$10,749.64 + GST at a guess

Christ, that's alright... I paid almost that 20 years ago..

m16d - 2021-01-29 20:24:00
6

The thing about ballpark figures is that you know how big a ballpark is.

How big is the retaining wall likely to be? Height and width.

pico42 - 2021-01-29 20:39:00
7
pico42 wrote:

The thing about ballpark figures is that you know how big a ballpark is.

How big is the retaining wall likely to be? Height and width.

The thing with a ballpark figure is that if you build it, they will come.

sparkychap - 2021-01-29 20:39:00
8

A ballpark figure. Is that any thing like an hourglass figure?

thumbs647 - 2021-01-30 07:16:00
9

If you are digging out and building a retaining wall, you will also have to consider drainage which can prove costly. We had flood which penetrated block wall of carport, flooded same and then entered house thru laundry. The cost of remedying this was $15,000 in Whangarei just a few months ago. Found original work hd not been done to submitted plans! Capricorngirl

mlarkin - 2021-01-30 08:12:00
10
2real wrote:

Has anyone dug out and retained a bank to build a double garage? The council have confirmed it would be possible but I'm wanting to have a ballpark understanding of what the cost might be to help me decide if I make an offer on a house that is for sale.

what an who are you retaining on top thou? Talk to an engineer.

gabbysnana - 2021-01-30 09:44:00
11
stevo2 wrote:

$10,749.64 + GST at a guess

You sure you've allowed for everything in that price???

mrcat1 - 2021-01-30 10:32:00
12
sparkychap wrote:

The thing with a ballpark figure is that if you build it, they will come.

Not at $10,749.64 + GST they won’t.

pico42 - 2021-01-30 10:46:00
13

Hi - I expect it's well over $10k - the area to remove would be about 6m wide, deep and high so a significant amount of rock and soil to remove. I know I'm unlikely to get an accurate quote but was just interested in case anyone had recent experience. Thx

2real - 2021-01-30 15:51:00
14
mrcat1 wrote:

You sure you've allowed for everything in that price???

my price was based on all the information given in post #1. you could always price against me Mrcat1.

stevo2 - 2021-01-30 16:04:00
15
stevo2 wrote:

my price was based on all the information given in post #1. you could always price against me Mrcat1.

I'm not sure how to build a retaining wall.
You frightened you might get the job now??
Once rock was mentioned I thought cha ching.

Edited by mrcat1 at 8:46 pm, Sat 30 Jan

mrcat1 - 2021-01-30 20:44:00
16
mrcat1 wrote:

I'm not sure how to build a retaining wall.
You frightened you might get the job now??
Once rock was mentioned I thought cha ching.

All good, I know a guy with a big arsed Caterpillar digger that can dig anything

stevo2 - 2021-01-30 21:15:00
17
stevo2 wrote:

All good, I know a guy with a big arsed Caterpillar digger that can dig anything

I think its making its own sandpit down at the beach.

mrcat1 - 2021-01-30 22:59:00
18

Friend of mine replaced a single garage on the flat, one of those Wellington situations with a few steps to the front door so garage was sort of built in to the side of the garden (hard to describe, I'm trying to say not loads of retaining steep high land) a small corner of the neighbours house was sitting on friends old garage.

She told me it was over 100K & took months from start to finish!

magicroundbout - 2021-02-01 03:38:00
19

Ours was around $20k.

landylass - 2021-02-01 07:02:00
20

Council consent and inspections $25K.
Digger & driver $5K.
Retaining wall $8K
GST $6K

Therapy to recover from dealing with council BS $3K + GST.
Luckily we are so lightly taxed!

Edited by pcle at 10:13 am, Mon 1 Feb

pcle - 2021-02-01 10:12:00
21
pcle wrote:

Council consent and inspections $25K.
Digger & driver $5K.
Retaining wall $8K
GST $6K

Therapy to recover from dealing with council BS $3K + GST.
Luckily we are so lightly taxed!

You quite obviously have no ideas off costs, you have nothing for design engineers, council costs wont be as much as you claimed, and if you need to spend $25k on council for a wall, then the wall build is going to cost $150-200k.

mrcat1 - 2021-02-01 10:53:00
22

At a guess, lots.

amasser - 2021-02-01 10:57:00
23

Different soil conditions will affect the cost by at least a factor of 10.

In a TC3 zone it might cost over $1,000,000.

Edited by tony9 at 3:26 pm, Mon 1 Feb

tony9 - 2021-02-01 15:24:00
24

Well I spose a basic base point shouldn't be that hard to start with & then up or down accordingly.

Presume good soil & expected good new foundation ground
No big rocks to remove
No buried piping/ cables to remove/ shift
Drainage easy to deal with
A standalone hole size of 6m x 3m x 2.4
Easy access
Std waterproofing & concrete walling for that size
Average ideal permit costs for that situation.
Most likely flat roof.
Basic power fitted, (easy job situation)
No unusual location EQC to worry about, (it's not a risk area)
Bare minimum to average tech/design costs for the above situation

Basically, average price for a no hassle hole in a bank with shed built inside

Edited by mrfxit at 6:55 pm, Mon 1 Feb

mrfxit - 2021-02-01 18:53:00
25

So effectively depending how far off the boundary it is and if there's any surcharge from neighbouring property.
1) Engineers report and design cost,
2) Geotech report and design cost, Both these could be one cost if the engineer involved has appropriate qualifications,
3) Council consent cost, If its on the boundary, over 1500mm high or have surcharge then its a consent,
4) Surveyor cost if no pegs visible,
5) Construction costs, and depending if its good ground or rock, that in its self can make a huge difference to the price. The cost to drill a hole thru rock 600mm x 2.4 - 3m deep is going to be a lot in itself.

mrcat1 - 2021-02-01 19:30:00
26

Come on, mrcat, if you don't know the answer you can just say so.

sparkychap - 2021-02-01 20:15:00
27

This message was deleted.

hooserat - 2021-02-01 20:23:00
28

To be honest, we dont even know if the aforementioned retaining wall is to be built on the "high side" or the "low" side of the proposed garage

stevo2 - 2021-02-01 20:33:00
29
mrcat1 wrote:

So effectively depending how far off the boundary it is and if there's any surcharge from neighbouring property.
1) Engineers report and design cost,
2) Geotech report and design cost, Both these could be one cost if the engineer involved has appropriate qualifications,
3) Council consent cost, If its on the boundary, over 1500mm high or have surcharge then its a consent,
4) Surveyor cost if no pegs visible,
5) Construction costs, and depending if its good ground or rock, that in its self can make a huge difference to the price. The cost to drill a hole thru rock 600mm x 2.4 - 3m deep is going to be a lot in itself.

This is NZ stop being so technical and realistic lol.

gamefisher - 2021-02-01 21:00:00
30
stevo2 wrote:

To be honest, we dont even know if the aforementioned retaining wall is to be built on the "high side" or the "low" side of the proposed garage

Exactly, no dimension's as to length or retained height, if there's any surcharge, so its quite likely you've got the job.

mrcat1 - 2021-02-01 21:40:00
31
pcle wrote:

Council consent and inspections $25K.
Digger & driver $5K.
Retaining wall $8K
GST $6K

Therapy to recover from dealing with council BS $3K + GST.
Luckily we are so lightly taxed!

This of course assumes that you can get at it with a digger & driver as opposed to a labourer and a wheel barrow !!

onl_148 - 2021-02-02 14:45:00
32
mrcat1 wrote:

Exactly, no dimension's as to length or retained height, if there's any surcharge, so its quite likely you've got the job.

All good. Im getting better at them now https://trademe.tmcdn.co.nz/photoserver/full/1480685348.jpg

stevo2 - 2021-02-02 18:40:00
33

The member deleted this message.

autumnwinds - 2021-02-02 21:07:00
34
stevo2 wrote:

All good. Im getting better at them now
https://trademe.tmcdn.co.nz/photoserver/full/1480685348.jpg

.

Edited by autumnwinds at 9:11 pm, Tue 2 Feb

autumnwinds - 2021-02-02 21:08:00
35
stevo2 wrote:

All good. Im getting better at them now https://trademe.tmcdn.co.nz/photoserver/full/1480685348.jpg[
/quote]

That's a cool job, its a real art to get bends like that in walls without them flying to bits.
Maybe I need you to teach me how to build walls.
I can only get my walls to look like this.
https://trademe.tmcdn.co.nz/photoserver/full/1480767949.jpg

Edited by mrcat1 at 9:20 pm, Tue 2 Feb

mrcat1 - 2021-02-02 21:12:00
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