Maryland Assessment Manual
Computer Assisted Mass Appraisal
State Department of Assessments and Taxation
CAMA Table of Contents SDAT Home

EXAMPLE

SQUARE FOOT RATE CALCULATION VIA FORMULA

Reference Section 2 of the preceding property worksheet. Note that Section 1 of the Dwelling is a 2 story with basement frame (siding) building of 672 square feet and that Section 2 of the Dwelling is a 1 story no basement frame (siding) section of 264 square feet.

In the Administrative data area of the worksheet, one may note that the structure is a grade 4 quality of construction, that the perimeter of section one is 104 lineal feet, that the total perimeter is 148 lineal feet and that the total foundation square footage is 936 square feet.

The following calculation of the square foot rates would occur using the above information and the square foot rates tables and other charge rate table for grade 4 residences:

Section 1 - 2 story with basement grade 4 frame structure

 

Building Constant Rate
$24,076.00 

Square Foot Rate of $83.79 times
Square Foot Size for Section 1 of 672
Square Feet equals

 

 

$56,306.88


Frame (siding) Perimeter Rate of $241.99
times Perimeter of Section 1 of 104 Lineal
Feet equals

 

 

$25,166.96


Total of All Square Foot Rate
Components for Section 1

 

 

$105,549.84


Foundation Square Feet of Section 1

 

672


Square Foot Rate for Section 1
is Total Square Foot Rate Components
Divided by the Foundation Square Feet
(105,549.84 ÷ 672 square feet) equals

 

 

$157.07

 

This Square Foot rate appears in the rate column in Section 2 of the preceding property worksheet for Section 1.

The Base Building Value for Section 1 of the Dwelling in Section 2 of the worksheet is:

 

Sec. Story Type Square Feet Rate Cost
1 2 Story with Basement Siding 672 157.07 $105,549

 

CAMA - I - 4 Revised 12/01

 

SQUARE FOOT RATE CALCULATION VIA FORMULA (continued)

Section 2 - 1 story, no basement grade 4 frame structure

Building Constant Rate
$19,249.00
Square Foot Rate of $44.53 times
Square Foot Size for Total Foundation
of 936 Square Feet equals

 

$41,680.08

Frame Perimeter Rate of $130.93 times
Total Perimeter of 148 Lineal Feet equals

 

$19,377.64

Total of All Square Foot Rate
Components for Section 2

$80,306.72

Total Foundation Square Feet

936

Square Foot Rate for Section 2
is Total Square Foot Rate Components
Divided by the Total Foundation Square Feet
($80,306.72 ÷ 936 square feet) equals

 

 

$85.80

 

This Square Foot rate appears in the rate column in Section 2 of the preceding property worksheet for Section 2. This rate is multiplied by the actual square footage of Section 2 to produce the base building value for Section 2.

The Base Building Value for Section 2 of the Dwelling in Section 2 of the worksheet is:

 

Sec. Story Type Square Feet Rate Cost
2 1 Story No Basement Siding 264 85.80 $22,650

Other Charges for deviations not included in square foot cost rates are itemized in Section 4 of the preceding worksheet. These are computed using the other charge rate for grade 4 structures from the other charge rate table. A summary of these are listed below:


4. OTHER CHARGES

ITEM
SIZE/UNIT
RATE
COST
Roof - Composition Shingle
Heat - Heat Pump
Baths (over allowance)
1
2,838.00
2,838
Club Room
200
21.41
4,282
A/C - Combined System
1,608
1.74
2,797
Half Baths
1
1,309.00
1,309
Fireplace - 1 Story Brick
1
3,689.00
3,689
Porch - 1 Story Open
60
28.12
1,687
Concrete Patio
120
2.25
270
Frame Garage
484
24.25
11,737

5. SUBTOTAL: OTHER CHARGES                                                                                   28,610 

 

CAMA-I-5 Revised 12/01

 

SQUARE FOOT RATE CALCULATION VIA FORMULA (continued)

The Cost Tables that follow are for manually developing square foot cost rates. Following the Square Foot Cost Tables are Other Charge Cost Tables which are used for valuing items not included in the Square Foot Rates.

The Square Foot Rate for Section 2 of the residential worksheet is multiplied by the applicable size to produce a current cost for Section 2. The sum of the costs for all sections and the total of all Other Charges is the total current replacement cost new of the dwelling. In subsequent valuations of the property via Computer Assisted Mass Appraisal the 2000 building costs will be indexed to produce a current cost of construction.

Note: Square foot rate formula deviations are made in the following areas:

CAMA - I - 6 Revised 12/01